Ah, Tollef shed some light on this. Ubuntu's glibc up to early Karmic had a patch applied which disabled unnecessary IPv6 DNS lookups (http://err.no/patches/glibc-only-lookup-ipv6-if-it-makes-sense.diff). This was dropped in Karmic to fix some IPv6 lookup issues (bug 239701, bug 374674), but also caused this regressions.
Mithrandir| so I suspect somebody should take my patch, refine it so it doesn't just reject v6 addresses (try again after processing if there no hits, allowing ipv6 then, or something like that) I confirm that in my dapper to jaunty chroots "normal" applications like wget, apt-get, firefox etc. work just fine. I was just misled to think it'd be a kernel issue because I used "host" (which also times out). http://bugs.debian.org/435646 is related to this, BTW. ** Bug watch added: Debian Bug tracker #435646 http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=435646 ** Package changed: linux (Ubuntu Lucid) => glibc (Ubuntu Lucid) ** Changed in: glibc (Ubuntu Lucid) Status: Confirmed => Triaged ** Changed in: glibc (Ubuntu Lucid) Assignee: (unassigned) => Canonical Foundations Team (canonical-foundations) ** Description changed: - Binary package hint: firefox-3.5 - - By default, when Firefox 3.5 is installed, web pages are loaded slowly - and it looks like IPv6 DNS lookups is the cause. However, you can go to - about:config and change network.dns.disableIPv6 to true, the problem - gets fixed. - - ProblemType: Bug - Architecture: i386 - Date: Sun Aug 23 12:06:13 2009 - DistroRelease: Ubuntu 9.10 - Package: firefox-3.5 3.5.2+nobinonly-0ubuntu2 - ProcEnviron: - LANG=en_US.UTF-8 - SHELL=/bin/bash - ProcVersionSignature: Ubuntu 2.6.31-6.26-generic - SourcePackage: firefox-3.5 - Uname: Linux 2.6.31-6-generic i686 + In Karmic, DNS lookups take a very long time with some routers, because + glibc's DNS resolver tries to do IPv6 (AAAA) lookups even if there are + no (non-loopback) IPv6 interfaces configured. Routers which do not + repond to this cause the lookup to take 20 seconds (until the IPv6 query + times out). ** Changed in: glibc (Ubuntu Karmic) Status: New => Triaged -- [karmic regression] all network apps / browsers suffer from multi-second delays by default due to IPv6 DNS lookups https://bugs.launchpad.net/bugs/417757 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
