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Re: Slow connections in Debian squeeze

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On 7-12-2009 1:15, Andrew Sackville-West wrote:
> On Sun, Dec 06, 2009 at 04:08:11PM -0800, Andrew Sackville-West wrote:
>> On Mon, Dec 07, 2009 at 01:56:06AM +0200, Andrei Popescu wrote:
>>> On Sun,06.Dec.09, 15:39:59, Andrew Sackville-West wrote:
>>>> there are clearly some differences. the lenny machine is making a 
>>>> AAAA? request (whatever that means) while the squeeze machine is 
>>>> making both a A? and AAAA? requests. And the responses are different. 
>>>> This behavior is consistent across attempts.
>>> This sounds like an ipv4/ipv6 issue. Maybe this NEWS.Debian entry for
>>> libc6 has the solution:
>>> glibc (2.9-8) unstable; urgency=low
>>>   Starting with version 2.9-8, unified IPv4/IPv6 lookup have been enabled
>>>   in the glibc's resolver. This is faster, fixes numerous of bugs, but is
>>>   problematic on some broken DNS servers and/or wrongly configured 
>>>   firewalls. 
>>>   If such a DNS server is detected, the resolver switches (permanently
>>>   for that process) to a mode where the second request is sent only when
>>>   the first answer has been received. This means the first request will
>>>   be timeout, but subsequent requests should be fast again. This 
>>>   behaviour can be enabled permanently by adding 'options single-request'
>>>   to /etc/resolv.conf.  
>> Andrei, I owe you a beer!
>> That's done it right there. Now it's just a matter of figuring out
>> whether it's my firewall or my dns server that's broken... :)
> blech... it's my firewall, or several public dns servers are broken...
> A

How did you go about checking this? I use OpenDNS as dns servers and no
other firewall than what comes with Debian by default.
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