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[Bug 1527902] Re: 3.13.0-71: IPv6 UDP DNS packets are not received
For reproducing just try to use Kopete IM client and try to connect to
some jabber server. Kopete must use IPv6 recursive DNS server for
translating jabber SRV or A records. DNS server address is read from
standard file /etc/resolv.conf.
So if you do not have IPv6 connectivity, you can you start some
recursive (or forward) DNS server on IPv6 localhost and set nameserver
::1 in /etc/resolv.conf. This is quick hack, but should work.
I see that NetworkManager on Ubuntu is already using dnsmasq (as
forwarder), but does not have enabled IPv6 support on localhost. It
automatically add "nameserver 127.0.0.1" line into /etc/resolv.conf.
To tell dnsmasq to listen also on IPv6 localhost add configuration like:
$ echo listen-address=::1 > /etc/NetworkManager/dnsmasq.d/ipv6
And set "nameserver ::1" in /etc/resolv.conf (note that NetworkManager
is changing that file when reconnecting...)
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3.13.0-71: IPv6 UDP DNS packets are not received
Status in linux package in Ubuntu:
Status in linux-lts-trusty package in Ubuntu:
After upgrading linux kernel from version 3.13.0-68 to 3.13.0-71 then
Kopete (IM messenger) stopped working, cannot connect to any jabber
I started debugging this problem and found out that, problem resolve
when I boot back 3.13.0-68 kernel version (without touching any system
files or packages). When I boot 3.13.0-71 Kopete always does not
Next I debugged that problem on 3.13.0-71 is just when
/etc/resolv.conf contains only IPv6 addresses of DNS servers.
Problem is comes down to dns resolver (jabber in Kopete has its own
for SRV records) and syscall recvfrom() (on IPv6 socket) always return
error -EAGAIN without any data returned. But wireshark see that DNS
response was recevied.
So it looks like that after 3.13.0-68 kernel was included some change
which broke receiving UDP packets via IPv6 socket. IPv4 is OK.
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