Is ubuntu trying to resolve localhost to an ipv6 address?

[john]

Ok, Thanks Gavin,

I think that's not the behaviour I want since I am not running ipv6
and I don't need the extra chatter on the network.
If I change /etc/modprobe.d/aliases to read

alias net-pf-10 ipv6 off

will bad things happen?

Thanks for your advice.

John


On Wed, Apr 21, 2010 at 2:30 PM, Gavin McCullagh <gmccullagh at gmail.com> wrote:
> Hi,
>
> On Tue, 20 Apr 2010, john wrote:
>
>> I am troubleshooting some network issues. Running wireshark and
>> watching traffic I notice I have many messages like this:
>>
>> DNS Standard query AAAA localhost.vanguard.vashonsd.org
>> DNS Standard query response, no such name
>
> This is normal enough.  The process is usually:
>
> 1. The resolver will attempt to find an IPv6 AAAA address for the name.
> 2. If an IPv6 address is returned, see is there a route to it.
> 3. Attempt to connect over IPv6.
>
> If any of the above fail, do the same for IPv4.  So a DNS query for AAAA
> records is pretty normal.  If you don't have IPv6 set up, step 2 will fail,
> even where a AAAA address is returned.
>
>> /etc/hosts looks like
>>
>> 127.0.0.1     localhost
>> 127.0.1.1     vbuntu vbuntu.vanguard.vashonsd.org
>> 10.114.5.50   paul.vanguard.vashonsd.org      paul
>>
>> my /etc/nsswitch.conf file has this entry
>>
>> hosts            files dns wins
>
> So when /etc/hosts is checked for a AAAA record, that fails and a DNS
> request is made.
>
>> What exactly is going on here? It looks like the server is trying to query
>> a IP6 FQDN for localhost.
>
> Yup.  This is pretty normal.
>
> Gavin
>
>
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