Bug#343140: libc6: resolver always checks search list in /etc/resolv.conf

[Edward Buck <ed@bashware.net>]

Stephen Gran wrote:
> At Thu, 15 Dec 2005 17:13:25 -0800, Edward Buck wrote:
>
> > I guess the problem then is in the ipv6 support and how it implements
> > domains in the search path.  Instead of doing ipv6, then ipv4 for
> > mx1.hotmail.com, it runs through all possible ipv6 queries, including
> > exhausting all domains in the search path, before ipv4 queries are
> > attempted.  That seems (is) really inefficient.  As a result of ipv6
> > supports, DNS queries have tripled on systems with two domains in their
> > search path.
> >
> > Okay, perhaps this isn't a bug.  It's just ipv6 hell.
>
> I guess the answer to this problem for you is to just disable ipv6
> (unless you need it) - blacklisting the kernel module(s) ought to do it,
> although there may be some other parts I am unaware of.

I did try commenting out:

#alias net-pf-10 ipv6

in /etc/modprobe.d/aliases.  Unfortunately, that doesn't keep the 
resolver from doing ipv6 queries.  The behavior is the same regardless 
of whether the ipv6 kernel module is loaded (rebooted after the change 
and lsmod shows no ipv6 module).

Is there another way to disable ipv6 queries by the resolver?  I'm 
probably missing something simple but couldn't find anything in the docs.

Thanks.
Regards,
Ed

> HTH, and take care,