I looked at this carefully; and wrote a (I hope) pretty complete blog post explaining the situation: http://blog.cyphermox.net/2012/08/bug-1010724-why-doesnt-dnsmasq-listen.html
I'll mark prioritize this down to Wishlist for now, since there doesn't in fact appear to be lag caused by the current setup. It's going to be something to revisit later should there be time to look into the situation, but I'm not going to worry too much about it unless there's clearly an issue. This is just a prioritization for the development work on NetworkManager by Ubuntu developers maintaining the package. It basically just means that *I* won't spend time looking into the situation further, but I'll be happy to sponsor patches should someone come up with a clever way to cover all the issues I noted in the above blog entry; namely: - It should show up in /etc/resolv.conf; but that also seems like unnecessary duplication of information. - Starting dnsmasq entries on ::1 may cause issues with other dnsmasq instances. It was brought to my attention that draft-smith-v6ops-larger-ipv6 -loopback-prefix-00 aims at fixing this, but it's going to take a while and lots of work for these solutions to be accepted and implemented. ** Changed in: network-manager (Ubuntu) Importance: Low => Wishlist -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to network-manager in Ubuntu. https://bugs.launchpad.net/bugs/1010724 Title: NM fails to start dnsmasq such that it listens on ::1 Status in “network-manager” package in Ubuntu: Triaged Bug description: I have IPv6 activated on Ubuntu 12.04 LTS and I receive an IPv6 address through DHCPv6. However, requests sent through IPv6 fail. For example: strainu@emily:~$ dig aaaa -6 google.com ; <<>> DiG 9.8.1-P1 <<>> aaaa -6 google.com ;; global options: +cmd ;; connection timed out; no servers could be reached But: strainu@emily:~$ dig aaaa google.com ; <<>> DiG 9.8.1-P1 <<>> aaaa google.com ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 60426 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 4, ADDITIONAL: 4 ;; QUESTION SECTION: ;google.com. IN AAAA ;; ANSWER SECTION: google.com. 94 IN AAAA 2a00:1450:400d:805::1000 Looking into /etc/resolv.conf, I see: strainu@emily:~$ cat /etc/resolv.conf # Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8) # DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN nameserver 127.0.0.1 search lan And with netstat: strainu@emily:~$ netstat -ln Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State tcp 0 0 127.0.0.1:53 0.0.0.0:* LISTEN tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN tcp6 0 0 ::1:631 :::* LISTEN udp 0 0 127.0.0.1:53 0.0.0.0:* udp 0 0 0.0.0.0:68 0.0.0.0:* udp 0 0 0.0.0.0:5353 0.0.0.0:* udp 0 0 0.0.0.0:38399 0.0.0.0:* udp6 0 0 :::47973 :::* udp6 0 0 :::5353 :::* Apparently, the local dnsmasq server does not listen on IPv6, which is wrong. The server should also listen on ::1:53, to allow IPv6-only connections. Alternatively, the resolvconf package should write the actual DNS server received through DHCPv6 in /etc/resolv.conf ProblemType: Bug DistroRelease: Ubuntu 12.04 Package: resolvconf 1.63ubuntu14 ProcVersionSignature: Ubuntu 3.2.0-24.39-generic 3.2.16 Uname: Linux 3.2.0-24-generic x86_64 ApportVersion: 2.0.1-0ubuntu8 Architecture: amd64 Date: Sat Jun 9 02:27:02 2012 InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012) PackageArchitecture: all SourcePackage: resolvconf UpgradeStatus: Upgraded to precise on 2012-05-28 (11 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1010724/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
