For IPv6 servers should use mechanisms to avoid having to do PMTUD. Set the MSS to the IPv6 network MTU. This really helps when there are asymmetric routing.
Set IPV6_USE_MINMTU to 1 on UDP sockets. Again this helps when there are asymmetric routing. Both of these also help when ICMPv6 is being blocked by operators that don’t understand IPv6. Mark > On 18 Mar 2025, at 14:40, internet-dra...@ietf.org wrote: > > Internet-Draft draft-ietf-dnsop-3901bis-01.txt is now available. It is a work > item of the Domain Name System Operations (DNSOP) WG of the IETF. > > Title: DNS IPv6 Transport Operational Guidelines > Authors: 山本 桃歌 > Tobias Fiebig > Name: draft-ietf-dnsop-3901bis-01.txt > Pages: 10 > Dates: 2025-03-17 > > Abstract: > > This memo provides guidelines and documents Best Current Practice for > operating authoritative and recursive DNS servers, given that queries > and responses are carried in a mixed environment of IPv4 and IPv6 > networks. This document expands on RFC 3901 by recommending that > authoritative and recursive resolvers support both IPv4 and IPv6. > > This document obsoletes RFC3901. (if approved) > > Discussion Venues > > This note is to be removed before publishing as an RFC. > > Source for this draft and an issue tracker can be found at > https://github.com/ietf-wg-dnsop/draft-ietf-dnsop-3901bis. > > The IETF datatracker status page for this Internet-Draft is: > https://datatracker.ietf.org/doc/draft-ietf-dnsop-3901bis/ > > There is also an HTML version available at: > https://www.ietf.org/archive/id/draft-ietf-dnsop-3901bis-01.html > > A diff from the previous version is available at: > https://author-tools.ietf.org/iddiff?url2=draft-ietf-dnsop-3901bis-01 > > Internet-Drafts are also available by rsync at: > rsync.ietf.org::internet-drafts > > > _______________________________________________ > DNSOP mailing list -- dnsop@ietf.org > To unsubscribe send an email to dnsop-le...@ietf.org -- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: ma...@isc.org _______________________________________________ DNSOP mailing list -- dnsop@ietf.org To unsubscribe send an email to dnsop-le...@ietf.org
