[Karmic] host -4 does IPv6 lookup -- times out

I some posts, I found that ip -6 route may provide useful info. Here is the output:

mvl@purple:~$ ip -6 r
fe80::/64 dev wlan0 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 0

a friend of mine does not have the problem on the LTS version (8.04) of Ubuntu, and a different network. The output of the above on her machine is
fe80::/64 dev eth1 metric 256 expires 21330140sec mtu 1500 advmss 1440 hoplimit 4294967295
ff00::/8 dev eth1 metric 256 expires 21330140sec mtu 1500 advmss 1440 hoplimit 4294967295

Could it be that there is something wrong with the IPv6 kernel setup in Karmic/on my system?

I am not able to reproduce this at all. I think you may have problems with your dns server.

chuck

Yes, the DNS server in my DSL modem does not support IPv6 (AAAAA requests
?). I am wondering why 'host' does a IPv6 (AAAAAA) lookup after receiving a
valid response on IPv4 (AAA request).

I try looking into the debug printouts, but did not learn much. I can post
the debug-output if it is helpful.

Marco.

On Mon, Jan 18, 2010 at 3:19 PM, Chuck Short <email address hidden>wrote:

> I am not able to reproduce this at all. I think you may have problems
> with your dns server.
>
> chuck
>
> ** Changed in: bind9 (Ubuntu)
> Importance: Undecided => Low
>
> ** Changed in: bind9 (Ubuntu)
> Status: New => Incomplete
>
> --
> [Karmic] host -4 does IPv6 lookup -- times out
> https://bugs.launchpad.net/bugs/504963
> You received this bug notification because you are a direct subscriber
> of the bug.
>

Please do

Hi Chuck,

Attached the debug printout from host -D. The first two files host_before_wait.log and host_all.log are from just running 'host -D www.google.com, while the file host_minus4*.log are from running host -D -4 www.google.com. In each case, the 'before_wait' file is the log up to the moment that the program gets temporarily stuck; it waits about half a second and then later once or twice more. Each time just after printing:
unlock_lookup dighost.c:2145
the full log is in the *all.log files.

Hope this is useful. Let me know if you need more info.

Marco.

A similar issue is discussed here:
https://bugs.launchpad.net/ubuntu/+source/eglibc/+bug/417757

but I think that's about a different DNS resolver. E.g. in Firefox you can switch off ipv6 lookups and the delay is gone. Also note the comment in that thread:

The 5 second lag occurs with the Livebox (used by Orange, 12 million broadband internet customers in Europe).

Looks like I'm one of the lucky 12 million :)

[Expired for bind9 (Ubuntu) because there has been no activity for 60 days.]