NAT64/DNS64 in the Networks with DNSSEC
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Zvyšuj?c? se pod?l resolverů a aplikac? použ?vaj?c? DNS-over-HTTPSvede k vyš?mu pod?lu klientů použ?vaj?c?ch DNS resolvery třet?chstran. Kvůli tomu ovšem selhává nejpouž?vanějš? NAT64 detekčn?metoda RFC7050[1], což vede u klientů použ?vaj?c?ch přechodovémechanismy NAT64/DNS64 nebo 464XLAT k neschopnosti tytopřechodové mechanismy správně detekovat, a t?m k nedostupnostiobsahu dostupného pouze po IPv4. C?lem této práce je navrhnoutnovou detekčn? metodu postavenou na DNS, která bude pracovati s resolvery třet?ch stran, a bude schopná využ?t zabezpečen? DNSdat pomoc? technologie DNSSEC. Práce popisuje aktuálně standardizovanémetody, protokoly na kterých závis?, jejich omezen?a interakce s ostatn?mi metodami. Navrhovaná metoda použ?vá SRVzáznamy k přenosu informace o použitém NAT64 prefixu v globáln?mDNS stromu. Protože navržená metoda použ?vá již standardizovanéprotokoly a typy záznamů, je snadno nasaditelná bez nutnostimodifikovat jak DNS server, tak s?t'ovou infrastrukturu. Protožemetoda použ?vá k distribuci informace o použitém prefixu globáln?DNS strom, umožňuje to metodě použ?t k zabezpečen? technologiiDNSSEC. To této metodě dává lepš? bezpečnostn? vlastnosti nežjaké vykazuj? předchoz? metody. Tato práce vytvář? standardizačn?bázi pro standardizaci v rámci IETF.
The rising number of DNS-over-HTTPS capable resolvers and applicationsresults in the higher use of third-party DNS resolvers byclients. Because of that, the currently most deployed method of theNAT64 prefix detection, the RFC7050[1], fails to detect the NAT64prefix. As a result, clients using either NAT64/DNS64 or 464XLATtransition mechanisms fail to detect the NAT64 prefix properly,making the IPv4-only resources inaccessible. The aim of this thesisis to develop a new DNS-based detection method that would workwith foreign DNS and utilize added security by the DNS securityextension, the DNSSEC. The thesis describes current methods ofthe NAT64 prefix detection, their underlying protocols, and theirlimitations in their coexistence with other network protocols. Thedeveloped method uses the SRV record type to transmit the NAT64prefix in the global DNS tree. Because the proposed method usesalready existing protocols and record types, the method is easilydeployable without any modification of the server or the transportinfrastructure. Due to the global DNS tree usage, the developedmethod can utilize the security provided by the DNSSEC and thereforeshows better security characteristics than previous methods.This thesis forms the basis for standardization effort in the IETF.
The rising number of DNS-over-HTTPS capable resolvers and applicationsresults in the higher use of third-party DNS resolvers byclients. Because of that, the currently most deployed method of theNAT64 prefix detection, the RFC7050[1], fails to detect the NAT64prefix. As a result, clients using either NAT64/DNS64 or 464XLATtransition mechanisms fail to detect the NAT64 prefix properly,making the IPv4-only resources inaccessible. The aim of this thesisis to develop a new DNS-based detection method that would workwith foreign DNS and utilize added security by the DNS securityextension, the DNSSEC. The thesis describes current methods ofthe NAT64 prefix detection, their underlying protocols, and theirlimitations in their coexistence with other network protocols. Thedeveloped method uses the SRV record type to transmit the NAT64prefix in the global DNS tree. Because the proposed method usesalready existing protocols and record types, the method is easilydeployable without any modification of the server or the transportinfrastructure. Due to the global DNS tree usage, the developedmethod can utilize the security provided by the DNSSEC and thereforeshows better security characteristics than previous methods.This thesis forms the basis for standardization effort in the IETF.
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Subject(s)
IPv6, IPv4aaS, NAT64/DNS64, 464XLAT, DNSSEC, DoH, IPv6, IPv4aaS, NAT64/DNS64, 464XLAT, DNSSEC, DoH