{"id":5245,"date":"2026-02-06T23:33:10","date_gmt":"2026-02-06T23:33:10","guid":{"rendered":"https:\/\/securitybriefing.net\/?p=5245"},"modified":"2026-02-06T23:52:27","modified_gmt":"2026-02-06T23:52:27","slug":"hogyan-javitsuk-meg-a-lassu-dns-keresest","status":"publish","type":"post","link":"https:\/\/securitybriefing.net\/hu\/technologia-2\/hogyan-javitsuk-meg-a-lassu-dns-keresest\/","title":{"rendered":"Hogyan jav\u00edtsuk a lass\u00fa DNS-keres\u00e9st"},"content":{"rendered":"<p>Lass\u00fa DNS lek\u00e9rdez\u00e9sek sz\u00fcks\u00e9gtelen k\u00e9sleltet\u00e9st okoznak, miel\u0151tt a b\u00f6ng\u00e9sz\u0151 egy\u00e1ltal\u00e1n elkezden\u00e9 bet\u00f6lteni a weboldalt. Egy tipikus DNS felold\u00e1s 20\u2013120 ms-ig tart, de a rosszul konfigur\u00e1lt vagy gyeng\u00e9n teljes\u00edt\u0151 DNS ezt j\u00f3val 100 ms f\u00f6l\u00e9 tolhatja \u2014 n\u00e9ha t\u00f6bb m\u00e1sodperces ter\u00fcletre. A DNS lek\u00e9rdez\u00e9si id\u0151 k\u00f6zvetlen\u00fcl befoly\u00e1solja az Els\u0151 B\u00e1jtig Eltelt Id\u0151t (TTFB), amely egy Core Web Vitals mutat\u00f3. A Google kutat\u00e1sa szerint a visszapattan\u00e1si val\u00f3sz\u00edn\u0171s\u00e9g 32%-r\u00f3l 90%-ra ugrik 3 m\u00e1sodpercr\u0151l 5 m\u00e1sodperces oldalbet\u00f6lt\u00e9si id\u0151re. A j\u00f3 h\u00edr: a legt\u00f6bb ok egyszer\u0171en diagnosztiz\u00e1lhat\u00f3 \u00e9s jav\u00edthat\u00f3.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n<h2 class=\"wp-block-heading\" id=\"contents\">Tartalom<\/h2>\n\n\n<ol class=\"wp-block-list\">\n<li><a href=\"#causes\">Mi okozza a lass\u00fa DNS-t<\/a><\/li>\n\n\n\n<li><a href=\"#diagnose\">1. l\u00e9p\u00e9s: Diagnosztiz\u00e1lja a probl\u00e9m\u00e1t<\/a><\/li>\n\n\n\n<li><a href=\"#restart\">2. l\u00e9p\u00e9s: Ind\u00edtsa \u00fajra a hardver\u00e9t<\/a><\/li>\n\n\n\n<li><a href=\"#switch-dns\">3. l\u00e9p\u00e9s: V\u00e1ltson gyorsabb DNS szolg\u00e1ltat\u00f3ra<\/a><\/li>\n\n\n\n<li><a href=\"#flush\">4. l\u00e9p\u00e9s: T\u00f6r\u00f6lje a DNS gyors\u00edt\u00f3t\u00e1r\u00e1t<\/a><\/li>\n\n\n\n<li><a href=\"#ipv6\">5. l\u00e9p\u00e9s: Jav\u00edtsa az IPv6 visszaes\u00e9si k\u00e9sleltet\u00e9st<\/a><\/li>\n\n\n\n<li><a href=\"#vpn\">6. l\u00e9p\u00e9s: Ellen\u0151rizze a VPN-t, antiv\u00edrust \u00e9s szellem adaptereket<\/a><\/li>\n\n\n\n<li><a href=\"#doh\">7. l\u00e9p\u00e9s: Konfigur\u00e1lja a DNS-t HTTPS felett (DoH)<\/a><\/li>\n\n\n\n<li><a href=\"#local-cache\">8. l\u00e9p\u00e9s: Futtasson helyi DNS gyors\u00edt\u00f3t\u00e1r szervert<\/a><\/li>\n\n\n\n<li><a href=\"#browser\">9. l\u00e9p\u00e9s: Jav\u00edtsa a b\u00f6ng\u00e9sz\u0151-specifikus DNS probl\u00e9m\u00e1kat<\/a><\/li>\n\n\n\n<li><a href=\"#optimize-records\">10. l\u00e9p\u00e9s: Optimaliz\u00e1lja a DNS rekordokat (weboldal tulajdonosok)<\/a><\/li>\n\n\n\n<li><a href=\"#reduce-domains\">11. l\u00e9p\u00e9s: Cs\u00f6kkentse a harmadik f\u00e9l domainjeit (weboldal tulajdonosok)<\/a><\/li>\n\n\n\n<li><a href=\"#prefetch\">12. l\u00e9p\u00e9s: Val\u00f3s\u00edtsa meg a DNS el\u0151bet\u00f6lt\u00e9st (webfejleszt\u0151k)<\/a><\/li>\n\n\n\n<li><a href=\"#troubleshooting\">Gyors-referencia hibakeres\u00e9si t\u00e1bl\u00e1zat<\/a><\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n<h2 class=\"wp-block-heading\" id=\"causes\">Mi okozza a lass\u00fa DNS-t<\/h2>\n\n\n<p>Sz\u00e1mos t\u00e9nyez\u0151 j\u00e1rul hozz\u00e1 a DNS k\u00e9sleltet\u00e9shez:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Lass\u00fa ISP \u00e1ltal biztos\u00edtott DNS szerverek<\/strong> \u2014 Az alap\u00e9rtelmezett felold\u00f3k az ISP-t\u0151l gyakran jelent\u0151sen lassabbak, mint a nyilv\u00e1nos alternat\u00edv\u00e1k. Az olyan regisztr\u00e1torok, mint a GoDaddy \u00e9s a Namecheap ingyenes DNS-ei is \u00e1ltal\u00e1ban lass\u00faak.<\/li>\n\n\n\n<li><strong>F\u00f6ldrajzi t\u00e1vols\u00e1g<\/strong> \u2014 Min\u00e9l t\u00e1volabb van a DNS szerver \u00d6nt\u0151l, ann\u00e1l hosszabb ideig tart az oda-vissza \u00fat.<\/li>\n\n\n\n<li><strong>IPv6 visszaes\u00e9si k\u00e9sleltet\u00e9s<\/strong> \u2014 A modern oper\u00e1ci\u00f3s rendszerek priorit\u00e1st adnak az IPv6 (AAAA) lek\u00e9rdez\u00e9seknek. Ha az ISP-je gyenge IPv6 t\u00e1mogat\u00e1ssal rendelkezik, az eszk\u00f6ze ak\u00e1r 5 m\u00e1sodpercig is v\u00e1rakozhat, miel\u0151tt visszaesik az IPv4-re.<\/li>\n\n\n\n<li><strong>T\u00falzott DNS rekordok<\/strong> \u2014 Nem haszn\u00e1lt vagy elavult A, CNAME \u00e9s TXT rekordok t\u00f6bbletterhel\u00e9st okoznak a lek\u00e9rdez\u00e9sek sor\u00e1n.<\/li>\n\n\n\n<li><strong>CNAME l\u00e1ncol\u00e1s<\/strong> \u2014 T\u00f6bbsz\u00f6r\u00f6s \u00e1tir\u00e1ny\u00edt\u00e1sok (CNAME \u2192 CNAME \u2192 A rekord) k\u00e9nyszer\u00edtik a sorozatos lek\u00e9rdez\u00e9seket, amelyek n\u00f6velik a k\u00e9sleltet\u00e9st.<\/li>\n\n\n\n<li><strong>Nincs DNS gyors\u00edt\u00f3t\u00e1raz\u00e1s<\/strong> \u2014 Gyors\u00edt\u00f3t\u00e1raz\u00e1s n\u00e9lk\u00fcl ugyanazok a DNS lek\u00e9rdez\u00e9sek ism\u00e9tl\u0151dnek minden oldalbet\u00f6lt\u00e9sn\u00e9l.<\/li>\n\n\n\n<li><strong>T\u00falterhelt n\u00e9vszerverek<\/strong> \u2014 Az alulm\u00e9retezett n\u00e9vszerverekkel rendelkez\u0151 t\u00e1rhelyszolg\u00e1ltat\u00f3k k\u00e9sleltet\u00e9st okoznak.<\/li>\n\n\n\n<li><strong>H\u00e1l\u00f3zati torl\u00f3d\u00e1s \u00e9s nem optim\u00e1lis \u00fatvonal<\/strong> \u2014 M\u00e9g egy k\u00f6zeli szerver is lehet lass\u00fa, ha az el\u00e9r\u00e9s\u00e9hez vezet\u0151 \u00fatvonal torl\u00f3dott.<\/li>\n\n\n\n<li><strong>VPN \u00e9s proxy interferencia<\/strong> \u2014 A VPN-ek a saj\u00e1t szervereiken kereszt\u00fcl ir\u00e1ny\u00edtj\u00e1k a DNS-t, ami lassabb lehet. N\u00e9h\u00e1ny DNS lek\u00e9rdez\u00e9st kisziv\u00e1rogtat a tunnelen k\u00edv\u00fclre.<\/li>\n\n\n\n<li><strong>Szellem h\u00e1l\u00f3zati adapterek<\/strong> \u2014 A VPN szoftverek, virtu\u00e1lis g\u00e9pek vagy Docker \u00e1ltal l\u00e9trehozott fantom adapterek elavult DNS konfigur\u00e1ci\u00f3kat tartanak, amelyek zavarj\u00e1k a felold\u00e1st.<\/li>\n\n\n\n<li><strong>Antiv\u00edrus\/t\u0171zfal DNS sz\u0171r\u00e9s<\/strong> \u2014 N\u00e9h\u00e1ny biztons\u00e1gi szoftver (Norton, Kaspersky, Bitdefender) elfogja a DNS lek\u00e9rdez\u00e9seket, n\u00f6velve a k\u00e9sleltet\u00e9st.<\/li>\n\n\n\n<li><strong>B\u00f6ng\u00e9sz\u0151 szint\u0171 DNS fel\u00fcl\u00edr\u00e1sok<\/strong> \u2014 A Chrome, Firefox \u00e9s Edge csendben fel\u00fcl\u00edrhatja az oper\u00e1ci\u00f3s rendszer DNS be\u00e1ll\u00edt\u00e1sait a saj\u00e1t be\u00e9p\u00edtett DNS HTTPS feletti (DoH) konfigur\u00e1ci\u00f3j\u00e1val.<\/li>\n\n\n\n<li><strong>T\u00fal sok harmadik f\u00e9l domain<\/strong> \u2014 Minden egyedi domain, amelyet a weboldala bet\u00f6lt, k\u00fcl\u00f6n DNS lek\u00e9rdez\u00e9st ig\u00e9nyel, ami n\u00f6veli az \u00f6sszes oldalbet\u00f6lt\u00e9si id\u0151t.<\/li>\n\n\n\n<li><strong>Nincs m\u00e1sodlagos DNS konfigur\u00e1lva<\/strong> \u2014 Visszaes\u00e9si DNS szerver n\u00e9lk\u00fcl a rendszer v\u00e1rakozik egy id\u0151t\u00fall\u00e9p\u00e9sre, ha az els\u0151dleges le van \u00e1llva vagy lass\u00fa.<\/li>\n<\/ul>\n\n\n<h2 class=\"wp-block-heading\" id=\"diagnose\">1. l\u00e9p\u00e9s: Diagnosztiz\u00e1lja a probl\u00e9m\u00e1t<\/h2>\n\n\n<p>Miel\u0151tt b\u00e1rmit is jav\u00edtana, gy\u0151z\u0151dj\u00f6n meg r\u00f3la, hogy a DNS val\u00f3ban a sz\u0171k keresztmetszet.<\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"using-dig-linuxmacos\">A dig haszn\u00e1lata (Linux\/macOS)<\/h3>\n\n\n<p>A <code>\u00e1s<\/code> parancs az els\u0151dleges eszk\u00f6z a DNS v\u00e1laszid\u0151 m\u00e9r\u00e9s\u00e9re:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><samp>1. K\u00e9rdezzen le egy adott DNS szervert \u00e9s ellen\u0151rizze a v\u00e1laszid\u0151t<br>\u00e1s example.com @8.8.8.8<br><br>1. Teljes iterat\u00edv nyomvonal, amely megmutatja minden ugr\u00e1s k\u00e9sleltet\u00e9s\u00e9t<br>\u00e1s example.com +trace<\/samp><\/p>\n<\/blockquote>\n\n\n\n<p>A kimenet tartalmaz egy <code>Lek\u00e9rdez\u00e9si id\u0151<\/code> mez\u0151t (pl. 34 ms). Ha ez meghaladja a 100 ms-ot, a DNS r\u00e9teg teljes\u00edtm\u00e9nyprobl\u00e9ma. Ide\u00e1lis esetben 50 ms alatt kell lennie.<\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"using-nslookup-windows\">Az nslookup haszn\u00e1lata (Windows)<\/h3>\n\n\n<p>Windows felhaszn\u00e1l\u00f3k sz\u00e1m\u00e1ra, <code>nslookup<\/code> az alap\u00e9rtelmezett DNS diagnosztikai eszk\u00f6z:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><samp>1. Alapvet\u0151 DNS lek\u00e9rdez\u00e9s<br>nslookup p\u00e9lda.com<br><br>1. K\u00e9rdezzen le egy adott DNS szervert<br>nslookup p\u00e9lda.com 8.8.8.8<br><br>1. Ellen\u0151rizze a domain n\u00e9vszervereit<br>nslookup -type=ns p\u00e9lda.com<\/samp><\/p>\n<\/blockquote>\n\n\n\n<p>Ha <code>nslookup<\/code> gyorsan ad vissza eredm\u00e9nyeket, de a b\u00f6ng\u00e9sz\u00e9s lass\u00fanak t\u0171nik, a probl\u00e9ma val\u00f3sz\u00edn\u0171leg a b\u00f6ng\u00e9sz\u0151 szint\u0171 DNS, az IPv6 visszaes\u00e9s vagy a VPN interferencia \u2014 nem maga a DNS szerver.<\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"using-ping-and-traceroute\">A ping \u00e9s traceroute haszn\u00e1lata<\/h3>\n\n\n<p>Tesztelje a nyers h\u00e1l\u00f3zati k\u00e9sleltet\u00e9st a DNS szerver\u00e9hez, hogy elv\u00e1lassza a h\u00e1l\u00f3zati probl\u00e9m\u00e1kat a DNS alkalmaz\u00e1si probl\u00e9m\u00e1kt\u00f3l:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><samp>1. Linux\/macOS<br>ping -c 3 8.8.8.8<br>traceroute 8.8.8.8<br><br>1. Windows<br>ping 8.8.8.8<br>tracert 8.8.8.8<\/samp><\/p>\n<\/blockquote>\n\n\n\n<p>Ha a ping magas k\u00e9sleltet\u00e9st mutat, de <code>\u00e1s<\/code> ugyanarra a szerverre ar\u00e1nyosan lass\u00fa, a probl\u00e9ma a h\u00e1l\u00f3zati t\u00e1vols\u00e1g, nem maga a DNS szerver.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"350\" src=\"https:\/\/securitybriefing.net\/wp-content\/uploads\/2026\/02\/Slow-DNS-Lookup.jpg\" alt=\"Lass\u00fa DNS lek\u00e9rdez\u00e9s\" class=\"wp-image-5246\" srcset=\"https:\/\/securitybriefing.net\/wp-content\/uploads\/2026\/02\/Slow-DNS-Lookup.jpg 600w, https:\/\/securitybriefing.net\/wp-content\/uploads\/2026\/02\/Slow-DNS-Lookup-300x175.jpg 300w, https:\/\/securitybriefing.net\/wp-content\/uploads\/2026\/02\/Slow-DNS-Lookup-18x12.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure>\n\n\n<h3 class=\"wp-block-heading\" id=\"dns-benchmark-tools\">DNS Benchmark Eszk\u00f6z\u00f6k<\/h3>\n\n\n<ul class=\"wp-block-list\">\n<li><strong>GRC DNS Benchmark<\/strong> \u2014 Egy Windows seg\u00e9dprogram, amely t\u00f6bb tucat DNS szervert tesztel \u00e9s rangsorol sebess\u00e9g alapj\u00e1n az \u00d6n hely\u00e9r\u0151l. Nagyon aj\u00e1nlott a leggyorsabb felold\u00f3 megtal\u00e1l\u00e1s\u00e1hoz az \u00d6n konkr\u00e9t h\u00e1l\u00f3zat\u00e1hoz.<\/li>\n\n\n\n<li><strong>Namebench<\/strong> \u2014 Google tulajdon\u00fa eszk\u00f6z, amely megtal\u00e1lja a leggyorsabb DNS szervereket az \u00d6n sz\u00e1m\u00edt\u00f3g\u00e9p\u00e9hez.<\/li>\n\n\n\n<li><strong>DNSPerf<\/strong> \u2014 Ny\u00edlt forr\u00e1sk\u00f3d\u00fa eszk\u00f6z az autoritat\u00edv DNS szerverek terhel\u00e9s alatti teljes\u00edtm\u00e9ny\u00e9nek m\u00e9r\u00e9s\u00e9re.<\/li>\n\n\n\n<li><strong>dnsdiag (dnsping, dnstraceroute, dnseval)<\/strong> \u2014 Egy Python eszk\u00f6zk\u00e9szlet a DNS m\u00e9r\u00e9s\u00e9re. Telep\u00edtse a <code>pip3 install dnsdiag<\/code>.<\/li>\n\n\n\n<li><strong>dnsspeedtest.site<\/strong> \u2014 B\u00f6ng\u00e9sz\u0151 alap\u00fa eszk\u00f6z, amely t\u00f6bb mint 20 DNS szolg\u00e1ltat\u00f3t tesztel DNS HTTPS felett szoftver telep\u00edt\u00e9se n\u00e9lk\u00fcl.<\/li>\n<\/ul>\n\n\n<h2 class=\"wp-block-heading\" id=\"restart\">2. l\u00e9p\u00e9s: Ind\u00edtsa \u00fajra a hardver\u00e9t<\/h2>\n\n\n<p>A legegyszer\u0171bb jav\u00edt\u00e1s, amit gyakran figyelmen k\u00edv\u00fcl hagynak. Az \u00fatv\u00e1laszt\u00f3 \u00fajraind\u00edt\u00e1sa t\u00f6rli annak bels\u0151 DNS gyors\u00edt\u00f3t\u00e1r\u00e1t \u00e9s megoldhatja az \u00fatvonalv\u00e1laszt\u00e1si probl\u00e9m\u00e1kat. Sok ISP \u00fatv\u00e1laszt\u00f3 be\u00e9p\u00edtett DNS tov\u00e1bb\u00edt\u00f3val rendelkezik, amely id\u0151vel t\u00falterhel\u0151dhet vagy elavulhat.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>H\u00fazza ki az \u00fatv\u00e1laszt\u00f3t 30 m\u00e1sodpercre, majd dugja vissza.<\/li>\n\n\n\n<li>Ind\u00edtsa \u00fajra a sz\u00e1m\u00edt\u00f3g\u00e9p\u00e9t, telefonj\u00e1t vagy t\u00e1blag\u00e9p\u00e9t.<\/li>\n\n\n\n<li>Ha k\u00fcl\u00f6n modemet haszn\u00e1l, azt is ind\u00edtsa \u00fajra.<\/li>\n<\/ul>\n\n\n\n<p>Ez t\u00f6rli az ideiglenes hib\u00e1kat \u00e9s friss DNS kapcsolatokat k\u00e9nyszer\u00edt. Pr\u00f3b\u00e1lja ki ezt b\u00e1rmilyen m\u00e1s jav\u00edt\u00e1s el\u0151tt.<\/p>\n\n\n<h2 class=\"wp-block-heading\" id=\"switch-dns\">3. l\u00e9p\u00e9s: V\u00e1ltson gyorsabb DNS szolg\u00e1ltat\u00f3ra<\/h2>\n\n\n<p>Ez a legnagyobb hat\u00e1s\u00fa jav\u00edt\u00e1s a legt\u00f6bb felhaszn\u00e1l\u00f3 sz\u00e1m\u00e1ra. Cser\u00e9lje le az ISP alap\u00e9rtelmezett DNS-\u00e9t egy gyorsabb nyilv\u00e1nos felold\u00f3ra. Mindig konfigur\u00e1ljon egy els\u0151dleges \u00e9s m\u00e1sodlagos DNS-t is \u2014 visszaes\u00e9si lehet\u0151s\u00e9g n\u00e9lk\u00fcl a rendszer v\u00e1rakozik egy id\u0151t\u00fall\u00e9p\u00e9sre, ha az els\u0151dleges le van \u00e1llva vagy lass\u00fa.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th>Szolg\u00e1ltat\u00f3<\/th><th>Els\u0151dleges<\/th><th>M\u00e1sodlagos<\/th><th>Er\u0151ss\u00e9gek<\/th><\/tr><tr><td>Cloudflare<\/td><td>1.1.1.1<\/td><td>1.0.0.1<\/td><td>Gyakran a leggyorsabb glob\u00e1lisan; er\u0151s adatv\u00e9delmi ir\u00e1nyelv; nem t\u00e1mogatja az EDNS Client Subnet-et (agressz\u00edvebb gyors\u00edt\u00f3t\u00e1raz\u00e1s).<\/td><\/tr><tr><td>Google Nyilv\u00e1nos DNS<\/td><td>8.8.8.8<\/td><td>8.8.4.4<\/td><td>Rendk\u00edv\u00fcl megb\u00edzhat\u00f3; magas rendelkez\u00e9sre \u00e1ll\u00e1s; t\u00e1mogatja az EDNS Client Subnet-et a jobb CDN \u00fatv\u00e1laszt\u00e1s \u00e9rdek\u00e9ben.<\/td><\/tr><tr><td>Quad9<\/td><td>9.9.9.9<\/td><td>149.112.112.112<\/td><td>Ismert rosszindulat\u00fa domaineket blokkol; er\u0151s biztons\u00e1gi f\u00f3kusz.<\/td><\/tr><tr><td>OpenDNS<\/td><td>208.67.222.222<\/td><td>208.67.220.220<\/td><td>Gyors lek\u00e9rdez\u00e9s feldolgoz\u00e1s; tartalomsz\u0171r\u00e9si lehet\u0151s\u00e9gek; sz\u00fcl\u0151i fel\u00fcgyelet.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><strong>Megjegyz\u00e9s a Cloudflare \u00e9s a Google k\u00f6z\u00f6tt:<\/strong> A ThousandEyes kutat\u00e1sa szerint a Cloudflare DNS felold\u00e1st biztos\u00edt az ISP szerverekkel egy szinten (\u00e1tlagosan 23,4 ms), m\u00edg a Google \u00e1tlaga 48,8 ms volt. Azonban a Google EDNS Client Subnet t\u00e1mogat\u00e1sa jav\u00edthatja a CDN gyors\u00edt\u00f3t\u00e1r tal\u00e1lati ar\u00e1nyokat. V\u00e1lasszon a priorit\u00e1sa alapj\u00e1n: nyers sebess\u00e9g (Cloudflare) vagy CDN optimaliz\u00e1l\u00e1s (Google).<\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"how-to-change-dns-on-windows\">Hogyan v\u00e1ltoztassuk meg a DNS-t Windows-on<\/h3>\n\n\n<p>Nyissa meg a Be\u00e1ll\u00edt\u00e1sok \u2192 H\u00e1l\u00f3zat \u00e9s Internet \u2192 Ethernet (vagy Wi-Fi). Kattintson a DNS szerver hozz\u00e1rendel\u00e9se melletti Szerkeszt\u00e9s gombra. V\u00e1ltson Manu\u00e1lisra, enged\u00e9lyezze az IPv4-et, \u00e9s adja meg a k\u00edv\u00e1nt DNS c\u00edmeket.<\/p>\n\n\n\n<p>Alternat\u00edvak\u00e9nt a Parancssorban:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><samp>netsh interface ip add dns name=&#8221;Ethernet&#8221; addr=1.1.1.1 index=1<br>netsh interface ip add dns name=&#8221;Ethernet&#8221; addr=1.0.0.1 index=2<\/samp><\/p>\n<\/blockquote>\n\n\n<h3 class=\"wp-block-heading\" id=\"how-to-change-dns-on-macoslinux\">Hogyan v\u00e1ltoztassuk meg a DNS-t macOS\/Linux-on<\/h3>\n\n\n<p>MacOS-en menjen a Rendszerbe\u00e1ll\u00edt\u00e1sok \u2192 H\u00e1l\u00f3zat \u2192 az \u00d6n kapcsolata \u2192 DNS, \u00e9s adja hozz\u00e1 a felold\u00f3 IP-ket. Linuxon szerkessze a <code>\/etc\/resolv.conf<\/code> vagy konfigur\u00e1lja a h\u00e1l\u00f3zatkezel\u0151j\u00e9n kereszt\u00fcl:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><samp>1. Linux: Szerkessze a \/etc\/resolv.conf f\u00e1jlt<br>sudo nano \/etc\/resolv.conf<br><br>1. Adja hozz\u00e1 ezeket a sorokat:<br>n\u00e9vszerver 1.1.1.1<br>n\u00e9vszerver 1.0.0.1<\/samp><\/p>\n<\/blockquote>\n\n\n<h3 class=\"wp-block-heading\" id=\"change-dns-on-your-router\">DNS m\u00f3dos\u00edt\u00e1sa az \u00fatv\u00e1laszt\u00f3n<\/h3>\n\n\n<p>H\u00e1l\u00f3zati szint\u0171 v\u00e1ltoztat\u00e1sokhoz friss\u00edtse a DNS be\u00e1ll\u00edt\u00e1sokat az \u00fatv\u00e1laszt\u00f3 adminisztr\u00e1ci\u00f3s panelj\u00e9n (\u00e1ltal\u00e1ban 192.168.1.1 vagy 192.168.0.1). Ez az \u00f6sszes eszk\u00f6zt \u00e9rinti a h\u00e1l\u00f3zaton \u2014 csak egyszer kell konfigur\u00e1lni, nem minden eszk\u00f6z\u00f6n.<\/p>\n\n\n<h2 class=\"wp-block-heading\" id=\"flush\">4. l\u00e9p\u00e9s: T\u00f6r\u00f6lje a DNS gyors\u00edt\u00f3t\u00e1r\u00e1t<\/h2>\n\n\n<p>Az elavult vagy s\u00e9r\u00fclt gyors\u00edt\u00f3t\u00e1r bejegyz\u00e9sek felold\u00e1si hib\u00e1kat okozhatnak vagy rossz IP-kre ir\u00e1ny\u00edthatnak \u00e1t. A t\u00f6rl\u00e9s friss lek\u00e9rdez\u00e9seket k\u00e9nyszer\u00edt:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th>OS<\/th><th>Parancs<\/th><\/tr><tr><td>Windows 10\/11<\/td><td><code>ipconfig \/flushdns<\/code><\/td><\/tr><tr><td>macOS (Ventura+)<\/td><td><code>sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder<\/code><\/td><\/tr><tr><td>Linux (systemd)<\/td><td><code>sudo systemd-resolve --flush-caches<\/code> vagy <code>sudo resolvectl flush-caches<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Ne feledje a b\u00f6ng\u00e9sz\u0151 szint\u0171 gyors\u00edt\u00f3t\u00e1rakat. A Chrome-ban navig\u00e1ljon a <code>chrome:\/\/net-internals\/#dns<\/code> \u00e9s kattintson a \u201cHoszt gyors\u00edt\u00f3t\u00e1r t\u00f6rl\u00e9se\u201d gombra. A Firefoxban a DNS gyors\u00edt\u00f3t\u00e1r t\u00f6rl\u0151dik, amikor \u00fajraind\u00edtja a b\u00f6ng\u00e9sz\u0151t, vagy t\u00f6r\u00f6lhet\u0151 a <code>about:networking#dns<\/code>.<\/p>\n\n\n<h2 class=\"wp-block-heading\" id=\"ipv6\">5. l\u00e9p\u00e9s: Jav\u00edtsa az IPv6 visszaes\u00e9si k\u00e9sleltet\u00e9st<\/h2>\n\n\n<p>Ez az egyik leggyakoribb rejtett oka a lass\u00fa DNS-nek, amit a szabv\u00e1nyos \u00fatmutat\u00f3k figyelmen k\u00edv\u00fcl hagynak. A modern oper\u00e1ci\u00f3s rendszerek az IPv6 (AAAA) lek\u00e9rdez\u00e9seket r\u00e9szes\u00edtik el\u0151nyben az IPv4-gyel szemben. Ha az ISP-je gyenge vagy nincs IPv6 t\u00e1mogat\u00e1sa, az eszk\u00f6ze ak\u00e1r 5 m\u00e1sodpercig is v\u00e1rakozhat egy IPv6 v\u00e1laszra, miel\u0151tt visszaesik az IPv4-re. Ez minden \u00faj kapcsol\u00f3d\u00e1sn\u00e1l megt\u00f6rt\u00e9nik.<\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"how-to-diagnose\">Hogyan diagnosztiz\u00e1ljuk<\/h3>\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><samp>1. Tesztelje az IPv6 kapcsolatot<br>ping -6 google.com<br><br>1. Ha ez id\u0151t\u00fall\u00e9p vagy m\u00e1sodperceket vesz ig\u00e9nybe, az IPv6 a probl\u00e9ma<br>1. Hasonl\u00edtsa \u00f6ssze az IPv4-gyel:<br>ping -4 google.com<\/samp><\/p>\n<\/blockquote>\n\n\n<h3 class=\"wp-block-heading\" id=\"how-to-fix\">Hogyan jav\u00edtsuk<\/h3>\n\n\n<p><strong>1. lehet\u0151s\u00e9g: Az IPv6 letilt\u00e1sa a h\u00e1l\u00f3zati adapteren<\/strong> (ha az ISP-je nem t\u00e1mogatja)<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Windows: H\u00e1l\u00f3zati adapter tulajdons\u00e1gai \u2192 t\u00f6r\u00f6lje az \u201cInternet Protocol Version 6 (TCP\/IPv6)\u201d jel\u00f6l\u00e9s\u00e9t\u201d<\/li>\n\n\n\n<li>Linux: Adja hozz\u00e1 a <code>net.ipv6.conf.all.disable_ipv6 = 1<\/code> -ra <code>\/etc\/sysctl.conf<\/code><\/li>\n\n\n\n<li>macOS: Rendszerbe\u00e1ll\u00edt\u00e1sok \u2192 H\u00e1l\u00f3zat \u2192 az \u00d6n kapcsolata \u2192 TCP\/IP \u2192 IPv6 konfigur\u00e1l\u00e1sa \u2192 Csak helyi kapcsolat<\/li>\n<\/ul>\n\n\n\n<p><strong>2. lehet\u0151s\u00e9g: Az IPv4 el\u0151nyben r\u00e9szes\u00edt\u00e9se<\/strong> an\u00e9lk\u00fcl, hogy teljesen letiltan\u00e1 az IPv6-ot \u2014 Linuxon szerkessze a <code>\/etc\/gai.conf<\/code> \u00e9s vonja vissza a <code>precedence ::ffff:0:0\/96 100<\/code>.<\/p>\n\n\n<h2 class=\"wp-block-heading\" id=\"vpn\">6. l\u00e9p\u00e9s: Ellen\u0151rizze a VPN-t, antiv\u00edrust \u00e9s szellem adaptereket<\/h2>\n\n<h3 class=\"wp-block-heading\" id=\"vpn-and-proxy-dns-interference\">VPN \u00e9s Proxy DNS interferencia<\/h3>\n\n\n<p>A VPN-ek gyakran a saj\u00e1t szervereiken kereszt\u00fcl ir\u00e1ny\u00edtj\u00e1k a DNS-t, ami lassabb lehet, mint a helyi felold\u00f3. N\u00e9h\u00e1ny VPN DNS lek\u00e9rdez\u00e9seket is kisziv\u00e1rogtat a tunnelen k\u00edv\u00fclre, ami k\u00f6vetkezetlen viselked\u00e9st okoz. A diagnosztiz\u00e1l\u00e1shoz:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>L\u00e1togasson el a <strong>dnsleaktest.com<\/strong> oldalra, mik\u00f6zben csatlakozik a VPN-hez, hogy ellen\u0151rizze a DNS sziv\u00e1rg\u00e1sokat.<\/li>\n\n\n\n<li>Ideiglenesen bontsa a VPN kapcsolatot \u00e9s tesztelje a DNS sebess\u00e9g\u00e9t. Ha gyorsabb VPN n\u00e9lk\u00fcl, a VPN DNS-e a sz\u0171k keresztmetszet.<\/li>\n\n\n\n<li>Sok VPN lehet\u0151v\u00e9 teszi egy\u00e9ni DNS szerverek konfigur\u00e1l\u00e1s\u00e1t \u2014 haszn\u00e1lja a Cloudflare-t vagy a Google-t a VPN szolg\u00e1ltat\u00f3 DNS-e helyett.<\/li>\n<\/ul>\n\n\n<h3 class=\"wp-block-heading\" id=\"antivirus-firewall-dns-filtering\">Antiv\u00edrus \/ T\u0171zfal DNS sz\u0171r\u00e9s<\/h3>\n\n\n<p>N\u00e9h\u00e1ny antiv\u00edrus szoftver (Norton, Kaspersky, Bitdefender) elfogja \u00e9s sz\u0171ri a DNS lek\u00e9rdez\u00e9seket, n\u00f6velve a k\u00e9sleltet\u00e9st. A biztons\u00e1gi t\u0171zfalak is blokkolhatj\u00e1k vagy korl\u00e1tozhatj\u00e1k a DNS forgalmat ismeretlen szerverekhez. A tesztel\u00e9shez:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Ideiglenesen tiltsa le az antiv\u00edrus webv\u00e9delmet \u00e9s tesztelje a DNS sebess\u00e9g\u00e9t.<\/li>\n\n\n\n<li>Ellen\u0151rizze a t\u0171zfal szab\u00e1lyait b\u00e1rmilyen DNS-hez kapcsol\u00f3d\u00f3 blokkol\u00e1sra (kimen\u0151 port 53 vagy 853).<\/li>\n\n\n\n<li>Ha a DNS gyorsabb antiv\u00edrus n\u00e9lk\u00fcl, adjon hozz\u00e1 kiv\u00e9telt a k\u00edv\u00e1nt DNS szerverekhez.<\/li>\n<\/ul>\n\n\n<h3 class=\"wp-block-heading\" id=\"ghost-network-adapters\">Szellem H\u00e1l\u00f3zati Adapterek<\/h3>\n\n\n<p>R\u00e9gi vagy fantom h\u00e1l\u00f3zati adapterek VPN szoftverekb\u0151l, virtu\u00e1lis g\u00e9pekb\u0151l (VMware, VirtualBox) vagy Dockerb\u0151l elavult DNS konfigur\u00e1ci\u00f3kat tarthatnak, amelyek zavarj\u00e1k a felold\u00e1st. A Windows k\u00fcl\u00f6n\u00f6sen hajlamos erre.<\/p>\n\n\n\n<p>Jav\u00edt\u00e1s Windows-on:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><samp>1. Mutassa meg a rejtett eszk\u00f6z\u00f6ket az Eszk\u00f6zkezel\u0151ben<br>1. Nyissa meg a CMD-t adminisztr\u00e1tork\u00e9nt:<br>set devmgr_show_nonpresent_devices=1<br>devmgmt.msc<br><br>1. Az Eszk\u00f6zkezel\u0151ben: N\u00e9zet \u2192 Rejtett eszk\u00f6z\u00f6k megjelen\u00edt\u00e9se<br>1. A H\u00e1l\u00f3zati adapterek alatt t\u00e1vol\u00edtson el minden sz\u00fcrke\/fantom adaptert<\/samp><\/p>\n<\/blockquote>\n\n\n<h2 class=\"wp-block-heading\" id=\"doh\">7. l\u00e9p\u00e9s: Konfigur\u00e1lja a DNS-t HTTPS felett (DoH)<\/h2>\n\n\n<p>A DNS HTTPS felett (DoH) titkos\u00edtja a DNS lek\u00e9rdez\u00e9seket HTTPS-ben, megakad\u00e1lyozva az ISP k\u00e9mked\u00e9st, a DNS hamis\u00edt\u00e1st \u00e9s a k\u00f6zbe\u00e9kel\u0151d\u00f6tt t\u00e1mad\u00e1sokat. Azonban probl\u00e9m\u00e1kat is okozhat, ha rosszul van konfigur\u00e1lva.<\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"benefits\">El\u0151ny\u00f6k<\/h3>\n\n\n<ul class=\"wp-block-list\">\n<li>Titkos\u00edtja a DNS forgalmat \u2014 az ISP-k \u00e9s a h\u00e1l\u00f3zati adminisztr\u00e1torok nem l\u00e1thatj\u00e1k a DNS lek\u00e9rdez\u00e9seit.<\/li>\n\n\n\n<li>Megakad\u00e1lyozza a DNS hamis\u00edt\u00e1st \u00e9s gyors\u00edt\u00f3t\u00e1r m\u00e9rgez\u00e9si t\u00e1mad\u00e1sokat.<\/li>\n\n\n\n<li>A 443-as portot haszn\u00e1lja (szabv\u00e1nyos HTTPS), \u00edgy ritk\u00e1n blokkolj\u00e1k t\u0171zfalak.<\/li>\n<\/ul>\n\n\n<h3 class=\"wp-block-heading\" id=\"potential-issues\">Potenci\u00e1lis probl\u00e9m\u00e1k<\/h3>\n\n\n<ul class=\"wp-block-list\">\n<li><strong>N\u00f6velt k\u00e9sleltet\u00e9s:<\/strong> A HTTPS\/TLS k\u00e9zfog\u00e1s t\u00f6bbletterhel\u00e9st okoz az els\u0151 kapcsol\u00f3d\u00e1sn\u00e1l. A k\u00e9s\u0151bbi lek\u00e9rdez\u00e9sek gyorsabbak a kapcsolat \u00fajrahasznos\u00edt\u00e1sa miatt.<\/li>\n\n\n\n<li><strong>Konfliktusok a helyi DNS sz\u0171r\u0151kkel:<\/strong> A DoH megker\u00fcli a Pi-hole-t, helyi DNS szervereket \u00e9s sz\u00fcl\u0151i fel\u00fcgyeletet.<\/li>\n\n\n\n<li><strong>VPN konfliktusok:<\/strong> A DoH a DNS-t a VPN alag\u00faton k\u00edv\u00fclre ir\u00e1ny\u00edthatja, ha nincs megfelel\u0151en konfigur\u00e1lva.<\/li>\n\n\n\n<li><strong>Megosztott DNS probl\u00e9m\u00e1k:<\/strong> A v\u00e1llalati k\u00f6rnyezetek, amelyek bels\u0151 DNS-t haszn\u00e1lnak helyi er\u0151forr\u00e1sokhoz, megszakadhatnak, ha a DoH enged\u00e9lyezve van.<\/li>\n\n\n\n<li><strong>B\u00f6ng\u00e9sz\u0151 fel\u00fcl\u00edr\u00e1s:<\/strong> A Chrome, Firefox \u00e9s Edge be\u00e9p\u00edtett DoH-val rendelkezik, amely csendben fel\u00fcl\u00edrhatja az oper\u00e1ci\u00f3s rendszer DNS be\u00e1ll\u00edt\u00e1sait.<\/li>\n<\/ul>\n\n\n<h3 class=\"wp-block-heading\" id=\"how-to-enable-doh\">Hogyan enged\u00e9lyezz\u00fck a DoH-t<\/h3>\n\n\n<p><strong>Windows 11:<\/strong> Be\u00e1ll\u00edt\u00e1sok \u2192 H\u00e1l\u00f3zat \u2192 Ethernet\/Wi-Fi \u2192 DNS \u2192 \u00e1ll\u00edtsa a \u201cPrefer\u00e1lt DNS titkos\u00edt\u00e1s\u201d opci\u00f3t \u201cCsak titkos\u00edtott (DNS over HTTPS)\u201d vagy \u201cTitkos\u00edtott prefer\u00e1lt, titkos\u00edtatlan enged\u00e9lyezett\u201d \u00e9rt\u00e9kre.\u201d<\/p>\n\n\n\n<p><strong>Chrome\/Edge:<\/strong> Be\u00e1ll\u00edt\u00e1sok \u2192 Adatv\u00e9delem \u2192 \u201cBiztons\u00e1gos DNS haszn\u00e1lata\u201d \u2192 v\u00e1lasszon szolg\u00e1ltat\u00f3t (Cloudflare, Google stb.).<\/p>\n\n\n\n<p><strong>Firefox:<\/strong> Be\u00e1ll\u00edt\u00e1sok \u2192 Adatv\u00e9delem \u00e9s biztons\u00e1g \u2192 \u201cDNS over HTTPS enged\u00e9lyez\u00e9se\u201d \u2192 v\u00e1lasszon szolg\u00e1ltat\u00f3t. Firefox alap\u00e9rtelmez\u00e9s szerint a Cloudflare-t haszn\u00e1lja az amerikai felhaszn\u00e1l\u00f3k sz\u00e1m\u00e1ra.<\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"how-to-disable-doh-when-troubleshooting\">Hogyan lehet letiltani a DoH-t (Hibaelh\u00e1r\u00edt\u00e1s eset\u00e9n)<\/h3>\n\n\n<ul class=\"wp-block-list\">\n<li>Windows 11: \u00c1ll\u00edtsa vissza a DNS titkos\u00edt\u00e1st \u201cCsak titkos\u00edtatlan\u201d \u00e9rt\u00e9kre.\u201d<\/li>\n\n\n\n<li>Chrome\/Edge: Kapcsolja ki a \u201cBiztons\u00e1gos DNS haszn\u00e1lata\u201d opci\u00f3t.<\/li>\n\n\n\n<li>Firefox: \u00c1ll\u00edtsa \u201cKi\u201d \u00e9rt\u00e9kre vagy \u00edrja be <code>about:config<\/code> \u00e9s \u00e1ll\u00edtsa be <code>network.trr.mode = 5<\/code>.<\/li>\n<\/ul>\n\n\n<h3 class=\"wp-block-heading\" id=\"dns-over-tls-dot-vs-doh\">DNS over TLS (DoT) vs DoH<\/h3>\n\n\n<p>A DoT egy alternat\u00edva, amely a DNS-t egy dedik\u00e1lt porton (853) titkos\u00edtja, ahelyett, hogy a HTTPS forgalommal kevern\u00e9 a 443-as porton. A DoT k\u00f6nnyebben azonos\u00edthat\u00f3 \u00e9s blokkolhat\u00f3\/kezelhet\u0151 v\u00e1llalati h\u00e1l\u00f3zatokon. A DoH beleolvad a szok\u00e1sos webforgalomba, \u00edgy nehezebb sz\u0171rni. Otthoni felhaszn\u00e1l\u00f3k sz\u00e1m\u00e1ra mindkett\u0151 m\u0171k\u00f6dik. A h\u00e1l\u00f3zati adminisztr\u00e1torok sz\u00e1m\u00e1ra, akiknek l\u00e1that\u00f3s\u00e1gra van sz\u00fcks\u00e9g\u00fck, \u00e1ltal\u00e1ban a DoT az el\u0151nyben r\u00e9szes\u00edtett.<\/p>\n\n\n<h2 class=\"wp-block-heading\" id=\"local-cache\">8. l\u00e9p\u00e9s: Futtasson helyi DNS gyors\u00edt\u00f3t\u00e1r szervert<\/h2>\n\n\n<p>A halad\u00f3 felhaszn\u00e1l\u00f3k \u00e9s h\u00e1l\u00f3zati adminisztr\u00e1torok sz\u00e1m\u00e1ra a helyi gyors\u00edt\u00f3t\u00e1raz\u00f3 DNS megold\u00f3 futtat\u00e1sa teljesen kik\u00fcsz\u00f6b\u00f6li az ism\u00e9tl\u0151d\u0151 lek\u00e9rdez\u00e9sek k\u00f6r\u00fcli utaz\u00e1sokat. Ahelyett, hogy minden alkalommal egy t\u00e1voli DNS szervert \u00e9rne el, a helyi gyors\u00edt\u00f3t\u00e1r azonnal v\u00e1laszol.<\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"popular-options\">N\u00e9pszer\u0171 opci\u00f3k<\/h3>\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Unbound<\/strong> \u2014 Egy valid\u00e1l\u00f3, rekurz\u00edv, gyors\u00edt\u00f3t\u00e1raz\u00f3 DNS megold\u00f3. Megakad\u00e1lyozza, hogy b\u00e1rmelyik nyilv\u00e1nos DNS szerver az \u00f6sszes rekordj\u00e1t birtokolja. T\u00e1mogatja a DoT-t a felfel\u00e9 ir\u00e1nyul\u00f3 titkos\u00edt\u00e1shoz.<\/li>\n\n\n\n<li><strong>dnsmasq<\/strong> \u2014 K\u00f6nny\u0171 DNS tov\u00e1bb\u00edt\u00f3 \u00e9s DHCP szerver. K\u00f6nnyen be\u00e1ll\u00edthat\u00f3 Linux routereken.<\/li>\n\n\n\n<li><strong>Pi-hole<\/strong> \u2014 H\u00e1l\u00f3zati szint\u0171 rekl\u00e1mblokkol\u00f3, amely DNS gyors\u00edt\u00f3t\u00e1rk\u00e9nt is szolg\u00e1l. Blokkolja a hirdet\u00e9seket \u00e9s k\u00f6vet\u0151ket DNS szinten, cs\u00f6kkentve a harmadik f\u00e9l DNS lek\u00e9rdez\u00e9seit minden eszk\u00f6z sz\u00e1m\u00e1ra.<\/li>\n<\/ul>\n\n\n<h3 class=\"wp-block-heading\" id=\"quick-setup-unbound-on-linux\">Gyors be\u00e1ll\u00edt\u00e1s: Unbound Linuxon<\/h3>\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><samp># Telep\u00edtse az Unbound-ot<br>sudo apt install unbound<br><br># Alapkonfigur\u00e1ci\u00f3: \/etc\/unbound\/unbound.conf<br>szerver:<br>&nbsp;&nbsp;&nbsp;&nbsp;interf\u00e9sz: 127.0.0.1<br>&nbsp;&nbsp;&nbsp;&nbsp;port: 53<br>&nbsp;&nbsp;&nbsp;&nbsp;hozz\u00e1f\u00e9r\u00e9s-vez\u00e9rl\u00e9s: 127.0.0.0\/8 enged\u00e9lyezett<br>&nbsp;&nbsp;&nbsp;&nbsp;gyors\u00edt\u00f3t\u00e1r-min-ttl: 300<br>&nbsp;&nbsp;&nbsp;&nbsp;gyors\u00edt\u00f3t\u00e1r-max-ttl: 86400<br>&nbsp;&nbsp;&nbsp;&nbsp;el\u0151t\u00f6lt\u00e9s: igen<br><br># Tov\u00e1bb\u00edt\u00e1s a Cloudflare-hez TLS felett<br>tov\u00e1bb\u00edt\u00f3-z\u00f3na:<br>&nbsp;&nbsp;&nbsp;&nbsp;n\u00e9v: \u201c.\u201d<br>&nbsp;&nbsp;&nbsp;&nbsp;tov\u00e1bb\u00edt\u00e1s-tls-felfel\u00e9: igen<br>&nbsp;&nbsp;&nbsp;&nbsp;tov\u00e1bb\u00edt\u00e1s-c\u00edm: 1.1.1.1@853<br>&nbsp;&nbsp;&nbsp;&nbsp;tov\u00e1bb\u00edt\u00e1s-c\u00edm: 1.0.0.1@853<br><br># Ind\u00edtsa el \u00e9s enged\u00e9lyezze<br>sudo systemctl enable unbound<br>sudo systemctl start unbound<br><br># \u00c1ll\u00edtsa be a rendszert a helyi megold\u00f3 haszn\u00e1lat\u00e1ra<br># Szerkessze az \/etc\/resolv.conf f\u00e1jlt:<br>n\u00e9vszerver 127.0.0.1<\/samp><\/p>\n<\/blockquote>\n\n\n\n<p>A <code>el\u0151t\u00f6lt\u00e9s: igen<\/code>, Az Unbound gyakran friss\u00edti a gyakran el\u00e9rt rekordokat, miel\u0151tt lej\u00e1rn\u00e1nak, \u00edgy szinte soha nem tapasztal hideg gyors\u00edt\u00f3t\u00e1r hi\u00e1nyt.<\/p>\n\n\n<h2 class=\"wp-block-heading\" id=\"browser\">9. l\u00e9p\u00e9s: Jav\u00edtsa a b\u00f6ng\u00e9sz\u0151-specifikus DNS probl\u00e9m\u00e1kat<\/h2>\n\n\n<p>A b\u00f6ng\u00e9sz\u0151k saj\u00e1t DNS viselked\u00e9ssel rendelkeznek, amely fel\u00fcl\u00edrhatja az oper\u00e1ci\u00f3s rendszer be\u00e1ll\u00edt\u00e1sait:<\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"chrome-edge\">Chrome \/ Edge<\/h3>\n\n\n<ul class=\"wp-block-list\">\n<li>A be\u00e9p\u00edtett \u201cBiztons\u00e1gos DNS\u201d (DoH) fel\u00fcl\u00edrhatja az oper\u00e1ci\u00f3s rendszer szint\u0171 DNS-t. Ellen\u0151rizze: Be\u00e1ll\u00edt\u00e1sok \u2192 Adatv\u00e9delem \u2192 \u201cBiztons\u00e1gos DNS haszn\u00e1lata.\u201d<\/li>\n\n\n\n<li>A Chrome saj\u00e1t DNS gyors\u00edt\u00f3t\u00e1rral rendelkezik. T\u00f6r\u00f6lje azt a <code>chrome:\/\/net-internals\/#dns<\/code> \u2192 \u201cGazda gyors\u00edt\u00f3t\u00e1r t\u00f6rl\u00e9se.\u201d<\/li>\n\n\n\n<li>Tov\u00e1bb\u00e1 t\u00f6r\u00f6lje az aljzat medenc\u00e9ket: <code>chrome:\/\/net-internals\/#sockets<\/code> \u2192 \u201cAljzat medenc\u00e9k \u00fcr\u00edt\u00e9se.\u201d<\/li>\n<\/ul>\n\n\n<h3 class=\"wp-block-heading\" id=\"firefox\">Firefox<\/h3>\n\n\n<ul class=\"wp-block-list\">\n<li>A Firefox saj\u00e1t Megb\u00edzhat\u00f3 Rekurz\u00edv Megold\u00f3val (TRR) rendelkezik, amely alap\u00e9rtelmez\u00e9s szerint a Cloudflare DoH-t haszn\u00e1lja az amerikai felhaszn\u00e1l\u00f3k sz\u00e1m\u00e1ra. Ez teljesen megker\u00fcli az oper\u00e1ci\u00f3s rendszer DNS be\u00e1ll\u00edt\u00e1sait.<\/li>\n\n\n\n<li>Ellen\u0151rizze az \u00e1llapotot: <code>about:networking#dns<\/code> hogy l\u00e1ssa a gyors\u00edt\u00f3t\u00e1razott DNS bejegyz\u00e9seket \u00e9s melyik megold\u00f3 akt\u00edv.<\/li>\n\n\n\n<li>A TRR letilt\u00e1s\u00e1hoz: Be\u00e1ll\u00edt\u00e1sok \u2192 Adatv\u00e9delem \u00e9s biztons\u00e1g \u2192 DNS over HTTPS \u2192 Ki.<\/li>\n\n\n\n<li>A letilt\u00e1s k\u00e9nyszer\u00edt\u00e9s\u00e9hez a konfigur\u00e1ci\u00f3n kereszt\u00fcl: <code>about:config<\/code> \u2192 \u00e1ll\u00edtsa be <code>network.trr.mode<\/code> -ra <code>5<\/code>.<\/li>\n<\/ul>\n\n\n<h3 class=\"wp-block-heading\" id=\"all-browsers\">Minden b\u00f6ng\u00e9sz\u0151<\/h3>\n\n\n<ul class=\"wp-block-list\">\n<li>Kiterjeszt\u00e9sek (rekl\u00e1mblokkol\u00f3k, adatv\u00e9delmi eszk\u00f6z\u00f6k) elfoghatj\u00e1k \u00e9s \u00e1tir\u00e1ny\u00edthatj\u00e1k a DNS-t. Teszteljen inkognit\u00f3\/priv\u00e1t m\u00f3dban, kiterjeszt\u00e9sek n\u00e9lk\u00fcl.<\/li>\n\n\n\n<li>Ha a DNS m\u0171k\u00f6dik a <code>\u00e1s<\/code> vagy <code>nslookup<\/code> de a b\u00f6ng\u00e9sz\u0151 lass\u00fa, a probl\u00e9ma b\u00f6ng\u00e9sz\u0151 szint\u0171 \u2014 nem a rendszer DNS.<\/li>\n<\/ul>\n\n\n<h2 class=\"wp-block-heading\" id=\"optimize-records\">10. l\u00e9p\u00e9s: Optimaliz\u00e1lja a DNS rekordokat (weboldal tulajdonosok)<\/h2>\n\n\n<p>Ha webhelyet kezel, \u00e9s a DNS lass\u00fa a l\u00e1togat\u00f3k sz\u00e1m\u00e1ra, ezek az optimaliz\u00e1l\u00e1sok \u00e9rv\u00e9nyesek:<\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"reduce-and-clean-up-records\">Cs\u00f6kkentse \u00e9s tiszt\u00edtsa meg a rekordokat<\/h3>\n\n\n<p>T\u00e1vol\u00edtsa el a nem haszn\u00e1lt A, CNAME, TXT \u00e9s MX rekordokat. Minden extra rekord terhet jelent a felold\u00e1s sor\u00e1n. Ellen\u0151rizze a DNS z\u00f3na f\u00e1jlt negyed\u00e9vente.<\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"eliminate-cname-chaining\">CNAME l\u00e1ncol\u00e1s megsz\u00fcntet\u00e9se<\/h3>\n\n\n<p>Ahelyett, hogy CNAME \u2192 CNAME \u2192 A rekord lenne, ir\u00e1ny\u00edtsa a domaineket k\u00f6zvetlen\u00fcl a v\u00e9gs\u0151 IP-re egy A rekordon kereszt\u00fcl. Sz\u00e1mos DNS szolg\u00e1ltat\u00f3 t\u00e1mogatja a <strong>CNAME lap\u00edt\u00e1st<\/strong> (m\u00e1s n\u00e9ven ALIAS rekordok), amely a l\u00e1ncot szerver oldalon oldja fel, \u00e9s egyetlen lek\u00e9rdez\u00e9sben adja vissza az IP-t.<\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"set-appropriate-ttl-values\">\u00c1ll\u00edtson be megfelel\u0151 TTL \u00e9rt\u00e9keket<\/h3>\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Stabil rekordok:<\/strong> Haszn\u00e1ljon magasabb TTL-eket (3600\u201386400 m\u00e1sodperc) a gyors\u00edt\u00f3t\u00e1raz\u00e1si el\u0151ny\u00f6k maximaliz\u00e1l\u00e1sa \u00e9rdek\u00e9ben.<\/li>\n\n\n\n<li><strong>Gyakran v\u00e1ltoz\u00f3 rekordok:<\/strong> Haszn\u00e1ljon 300\u2013600 m\u00e1sodperces (5\u201310 perces) TTL-eket.<\/li>\n\n\n\n<li>Ker\u00fclje az 86400 (24 \u00f3r\u00e1s) TTL be\u00e1ll\u00edt\u00e1s\u00e1t, hacsak a rekord val\u00f3ban soha nem v\u00e1ltozik, mivel ez k\u00e9slelteti a friss\u00edt\u00e9sek terjed\u00e9s\u00e9t.<\/li>\n<\/ul>\n\n\n<h3 class=\"wp-block-heading\" id=\"dnssec-considerations\">DNSSEC megfontol\u00e1sok<\/h3>\n\n\n<p>A DNSSEC kriptogr\u00e1fiai al\u00e1\u00edr\u00e1s-ellen\u0151rz\u00e9st ad a DNS v\u00e1laszokhoz, megakad\u00e1lyozva a gyors\u00edt\u00f3t\u00e1r m\u00e9rgez\u00e9st \u00e9s hamis\u00edt\u00e1st. Azonban n\u00f6veli a feldolgoz\u00e1si id\u0151t minden lek\u00e9rdez\u00e9sn\u00e9l. Az \u00e1tv\u00e1lt\u00e1s margin\u00e1lis k\u00e9sleltet\u00e9sn\u00f6veked\u00e9st jelent a jelent\u0151sen jobb biztons\u00e1g \u00e9rdek\u00e9ben. Enged\u00e9lyezze a DNSSEC-t, ha a biztons\u00e1g priorit\u00e1s; vegye figyelembe, hogy kiss\u00e9 n\u00f6velheti a felold\u00e1si id\u0151ket, k\u00fcl\u00f6n\u00f6sen lassabb hiteles n\u00e9vszervereken.<\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"use-a-premium-dns-provider-cdn\">Haszn\u00e1ljon pr\u00e9mium DNS szolg\u00e1ltat\u00f3t \/ CDN-t<\/h3>\n\n\n<p>Az ingyenes DNS a domain regisztr\u00e1torokt\u00f3l \u00e1ltal\u00e1ban lass\u00fa. A pr\u00e9mium DNS szolg\u00e1ltat\u00f3k (Cloudflare, AWS Route 53, Dyn, DNS Made Easy) hatalmas, glob\u00e1lisan elosztott anycast infrastrukt\u00far\u00e1val rendelkeznek, amelyet alacsony k\u00e9sleltet\u00e9s\u0171 v\u00e1laszokhoz terveztek. Egy CDN, mint a Cloudflare vagy Akamai, saj\u00e1t DNS infrastrukt\u00far\u00e1val rendelkezik, glob\u00e1lisan elosztott jelenl\u00e9tpontokkal, cs\u00f6kkentve a lek\u00e9rdez\u00e9si id\u0151ket a felhaszn\u00e1l\u00f3k sz\u00e1m\u00e1ra vil\u00e1gszerte.<\/p>\n\n\n<h2 class=\"wp-block-heading\" id=\"reduce-domains\">11. l\u00e9p\u00e9s: Cs\u00f6kkentse a harmadik f\u00e9l domainjeit (weboldal tulajdonosok)<\/h2>\n\n\n<p>Minden egyedi harmadik f\u00e9l domain, amelyet a webhelye bet\u00f6lt, k\u00fcl\u00f6n DNS lek\u00e9rdez\u00e9st ig\u00e9nyel. Ezek gyorsan \u00f6sszead\u00f3dnak \u2014 egy webhely, amely 7 k\u00fcls\u0151 domainr\u0151l t\u00f6lt be er\u0151forr\u00e1sokat, t\u00f6bb mint 1 m\u00e1sodperc DNS id\u0151t is felhalmozhat.<\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"how-to-reduce\">Hogyan cs\u00f6kkenthet\u0151<\/h3>\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Ellen\u0151rizze a k\u00fcls\u0151 er\u0151forr\u00e1sokat:<\/strong> Haszn\u00e1lja a b\u00f6ng\u00e9sz\u0151 DevTools (H\u00e1l\u00f3zat f\u00fcl) vagy a WebPageTest eszk\u00f6zt, hogy azonos\u00edtsa az \u00f6sszes egyedi domaint, amelyet a webhelye h\u00edv.<\/li>\n\n\n\n<li><strong>Saj\u00e1t hosztol\u00e1s, ahol lehets\u00e9ges:<\/strong> T\u00f6ltse le a harmadik f\u00e9l bet\u0171t\u00edpusait, szkriptjeit \u00e9s eszk\u00f6zeit, \u00e9s hosztolja azokat az eredeti szerver\u00e9n vagy CDN-j\u00e9n. Ez teljesen megsz\u00fcnteti a DNS lek\u00e9rdez\u00e9seiket.<\/li>\n\n\n\n<li><strong>CDN domainek konszolid\u00e1l\u00e1sa:<\/strong> Haszn\u00e1ljon egyetlen CDN aldomaint t\u00f6bb k\u00fcls\u0151 hoszt helyett.<\/li>\n\n\n\n<li><strong>T\u00e1vol\u00edtsa el a nem haszn\u00e1lt b\u0151v\u00edtm\u00e9nyeket \u00e9s k\u00f6vet\u0151ket:<\/strong> Minden b\u0151v\u00edtm\u00e9ny, amely k\u00fcls\u0151 JavaScript-et t\u00f6lt be, legal\u00e1bb egy DNS lek\u00e9rdez\u00e9st \u00e9s mag\u00e1t a szkriptet is hozz\u00e1adja.<\/li>\n<\/ul>\n\n\n<h3 class=\"wp-block-heading\" id=\"defer-noncritical-javascript\">Nem kritikus JavaScript elhalaszt\u00e1sa<\/h3>\n\n\n<p>A harmadik f\u00e9l JavaScript gyakran tov\u00e1bbi k\u00fcls\u0151 domaineket t\u00f6lt be. A nem kritikus JS elhalaszt\u00e1sa k\u00e9slelteti ezeket a DNS lek\u00e9rdez\u00e9seket, am\u00edg a f\u0151 oldal meg nem jelenik:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><samp>&lt;!&#8211; Defer non-critical third-party scripts &#8211;&gt;<br>&lt;script src=&#8221;https:\/\/analytics.example.com\/tracker.js&#8221; defer&gt;&lt;\/script&gt;<br><br>&lt;!&#8211; Async for scripts that don&#8217;t depend on page load order &#8211;&gt;<br>&lt;script src=&#8221;https:\/\/ads.example.com\/ad.js&#8221; async&gt;&lt;\/script&gt;<\/samp><\/p>\n<\/blockquote>\n\n\n\n<p>A <code>halasztott<\/code> vagy <code>aszinkron<\/code> haszn\u00e1lata megakad\u00e1lyozza, hogy ezek a szkriptek blokkolj\u00e1k a f\u0151 oldal megjelen\u00edt\u00e9s\u00e9t, mik\u00f6zben m\u00e9g mindig bet\u00f6lt\u0151dnek. Ezeknek a domaineknek a DNS lek\u00e9rdez\u00e9sei tov\u00e1bbra is megt\u00f6rt\u00e9nnek, de m\u00e1r nem akad\u00e1lyozz\u00e1k a felhaszn\u00e1l\u00f3t a tartalom megtekint\u00e9s\u00e9ben.<\/p>\n\n\n<h2 class=\"wp-block-heading\" id=\"prefetch\">12. l\u00e9p\u00e9s: Val\u00f3s\u00edtsa meg a DNS el\u0151bet\u00f6lt\u00e9st (webfejleszt\u0151k)<\/h2>\n\n\n<p>A modern b\u00f6ng\u00e9sz\u0151k t\u00e1mogatj\u00e1k a <code>dns-el\u0151h\u00edv\u00e1s<\/code> \u00e9s <code>el\u0151kapcsol\u00f3d\u00e1s<\/code> er\u0151forr\u00e1s-hint\u00e1kat, amelyek megoldj\u00e1k a DNS-t a harmadik f\u00e9l domainek sz\u00e1m\u00e1ra, miel\u0151tt a felhaszn\u00e1l\u00f3nak sz\u00fcks\u00e9ge lenne r\u00e1juk:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><samp>&lt;!&#8211; DNS prefetch for non-critical third-party domains &#8211;&gt;<br>&lt;link rel=&#8221;dns-prefetch&#8221; href=&#8221;https:\/\/fonts.googleapis.com&#8221;&gt;<br>&lt;link rel=&#8221;dns-prefetch&#8221; href=&#8221;https:\/\/analytics.example.com&#8221;&gt;<br><br>&lt;!&#8211; Preconnect for critical third-party domains (DNS + TCP + TLS) &#8211;&gt;<br>&lt;link rel=&#8221;preconnect&#8221; href=&#8221;https:\/\/cdn.example.com&#8221;&gt;<br>&lt;link rel=&#8221;preconnect&#8221; href=&#8221;https:\/\/api.example.com&#8221;&gt;<\/samp><\/p>\n<\/blockquote>\n\n\n\n<p>Haszn\u00e1lja a <code>el\u0151kapcsol\u00f3d\u00e1s<\/code> a legkritikusabb kapcsolatokhoz (ez kezeli a DNS + TCP + TLS-t) \u00e9s <code>dns-el\u0151h\u00edv\u00e1s<\/code> minden m\u00e1sra. Az el\u0151csatlakoz\u00e1s 100\u2013500 ms-ot takar\u00edthat meg kapcsolatk\u00e9nt, m\u00edg a DNS el\u0151t\u00f6lt\u00e9s 20\u2013120 ms-ot. Ne haszn\u00e1lja t\u00fal az el\u0151csatlakoz\u00e1st \u2014 mindegyik megnyit egy kapcsolatot, amely er\u0151forr\u00e1sokat fogyaszt.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n<h2 class=\"wp-block-heading\" id=\"troubleshooting\">Gyors-referencia hibakeres\u00e9si t\u00e1bl\u00e1zat<\/h2>\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th>T\u00fcnet<\/th><th>Val\u00f3sz\u00edn\u0171 ok<\/th><th>Jav\u00edt\u00e1s<\/th><\/tr><tr><td>Minden webhely lassan t\u00f6lt\u0151dik be az els\u0151 l\u00e1togat\u00e1skor<\/td><td>Lass\u00fa ISP DNS megold\u00f3<\/td><td>V\u00e1ltson Cloudflare-re (1.1.1.1) vagy Google-re (8.8.8.8). Ind\u00edtsa \u00fajra az \u00fatv\u00e1laszt\u00f3t el\u0151sz\u00f6r.<\/td><\/tr><tr><td>5 m\u00e1sodperces k\u00e9s\u00e9s, miel\u0151tt az oldalak bet\u00f6lt\u0151dn\u00e9nek<\/td><td>IPv6 visszaes\u00e9si k\u00e9sleltet\u00e9s<\/td><td>Tiltsa le az IPv6-ot a h\u00e1l\u00f3zati adapteren vagy \u00e1ll\u00edtsa be az oper\u00e1ci\u00f3s rendszert, hogy az IPv4-et r\u00e9szes\u00edtse el\u0151nyben.<\/td><\/tr><tr><td>Egy adott domain nem old\u00f3dik meg<\/td><td>Elavult DNS gyors\u00edt\u00f3t\u00e1r<\/td><td>T\u00f6r\u00f6lje a DNS gyors\u00edt\u00f3t\u00e1rat az oper\u00e1ci\u00f3s rendszeren \u00e9s a b\u00f6ng\u00e9sz\u0151ben.<\/td><\/tr><tr><td>A DNS m\u0171k\u00f6dik a termin\u00e1lban, de a b\u00f6ng\u00e9sz\u0151 lass\u00fa<\/td><td>B\u00f6ng\u00e9sz\u0151 DoH fel\u00fcl\u00edr\u00e1s vagy kiterjeszt\u00e9s interferencia<\/td><td>Ellen\u0151rizze a Chrome\/Firefox biztons\u00e1gos DNS be\u00e1ll\u00edt\u00e1sait. Teszteljen inkognit\u00f3 m\u00f3dban, kiterjeszt\u00e9sek n\u00e9lk\u00fcl.<\/td><\/tr><tr><td>A DNS csak akkor lass\u00fa, amikor a VPN csatlakoztatva van<\/td><td>VPN DNS \u00fatvonalaz\u00e1s<\/td><td>\u00c1ll\u00edtson be egyedi DNS-t a VPN be\u00e1ll\u00edt\u00e1saiban, vagy ellen\u0151rizze a DNS sziv\u00e1rg\u00e1sokat a dnsleaktest.com oldalon.<\/td><\/tr><tr><td>Id\u0151szakosan lass\u00fa DNS, amikor az antiv\u00edrus fut<\/td><td>Antiv\u00edrus DNS sz\u0171r\u00e9s<\/td><td>Ideiglenesen tiltsa le a webv\u00e9delmet. Adjon hozz\u00e1 DNS szerver kiv\u00e9teleket, ha gyorsabb.<\/td><\/tr><tr><td>dig +trace egy ugr\u00e1sn\u00e1l &gt;200 ms-ot mutat<\/td><td>Lass\u00fa hiteles n\u00e9vszerver<\/td><td>V\u00e1ltson DNS szolg\u00e1ltat\u00f3ra CDN architekt\u00far\u00e1val vagy haszn\u00e1ljon CNAME lap\u00edt\u00e1st.<\/td><\/tr><tr><td>Magas DNS id\u0151k a PageSpeed \/ WebPageTest-ben<\/td><td>T\u00fal sok harmadik f\u00e9l domain<\/td><td>Adjon hozz\u00e1 dns-prefetch \/ preconnect hint\u00e1kat. Cs\u00f6kkentse a k\u00fcls\u0151 domaineket. Halassza el a nem kritikus JS-t.<\/td><\/tr><tr><td>A DNS m\u0171k\u00f6dik, de id\u0151szakosan lass\u00fa<\/td><td>T\u00falterhelt n\u00e9vszerverek vagy k\u00eds\u00e9rtet adapterek<\/td><td>V\u00e9gezzen benchmarkot a GRC DNS Benchmarkkal. T\u00e1vol\u00edtsa el a fantom h\u00e1l\u00f3zati adaptereket. Fontolja meg a m\u00e1sodlagos DNS-t.<\/td><\/tr><tr><td>A DNS csak bizonyos r\u00e9gi\u00f3kb\u00f3l lass\u00fa<\/td><td>F\u00f6ldrajzi t\u00e1vols\u00e1g<\/td><td>Haszn\u00e1ljon glob\u00e1lis anycast DNS szolg\u00e1ltat\u00f3t (Cloudflare, Route 53).<\/td><\/tr><tr><td>Helyi h\u00e1l\u00f3zati domainek nem old\u00f3dnak meg, amikor a DoH be van kapcsolva<\/td><td>A DoH megker\u00fcli a helyi DNS-t<\/td><td>Tiltsa le a DoH-t a b\u00f6ng\u00e9sz\u0151ben vagy konfigur\u00e1ljon osztott DNS-t. Haszn\u00e1ljon DoT-t v\u00e1llalati k\u00f6rnyezetben.<\/td><\/tr><tr><td>Az oldalak lass\u00faak egy nemr\u00e9g telep\u00edtett szoftver ut\u00e1n<\/td><td>\u00daj VPN\/VM hozz\u00e1adott k\u00eds\u00e9rtet h\u00e1l\u00f3zati adaptert<\/td><td>Ellen\u0151rizze az Eszk\u00f6zkezel\u0151t k\u00eds\u00e9rtet adapterek\u00e9rt. T\u00e1vol\u00edtsa el az elavult DNS konfigur\u00e1ci\u00f3kat.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><\/p>","protected":false},"excerpt":{"rendered":"<p>Lass\u00fa DNS lek\u00e9rdez\u00e9sek felesleges k\u00e9sedelmet okoznak, miel\u0151tt a b\u00f6ng\u00e9sz\u0151je elkezden\u00e9 bet\u00f6lteni a weboldalt. Egy tipikus DNS felold\u00e1s 20\u2013120 ms-ig tart, de a rosszul konfigur\u00e1lt vagy alulteljes\u00edt\u0151 DNS ezt jelent\u0151sen meghosszabb\u00edthatja\u2026 <a class=\"more-link\" href=\"https:\/\/securitybriefing.net\/hu\/technologia-2\/hogyan-javitsuk-meg-a-lassu-dns-keresest\/\">Folytat\u00e1s <span class=\"screen-reader-text\">Hogyan jav\u00edtsuk a lass\u00fa DNS-keres\u00e9st<\/span><\/a><\/p>","protected":false},"author":3,"featured_media":5248,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[30],"tags":[],"class_list":["post-5245","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tech","entry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Fix Slow DNS Lookup: 12-Step Diagnostic &amp; Fix<\/title>\n<meta name=\"description\" content=\"How to fix slow DNS lookup in 12 steps. Covers dig, nslookup, IPv6 fallback, DoH, VPN conflicts, local caching, browser overrides, and DNS prefetching with code.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/securitybriefing.net\/hu\/technologia-2\/hogyan-javitsuk-meg-a-lassu-dns-keresest\/\" \/>\n<meta property=\"og:locale\" content=\"hu_HU\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to Fix Slow DNS Lookup: 12-Step Diagnostic &amp; Fix\" \/>\n<meta property=\"og:description\" content=\"How to fix slow DNS lookup in 12 steps. 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