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Re: Slow connections in Debian squeeze

On Mon, Dec 07, 2009 at 10:41:35AM +0100, Nick Douma wrote:
> 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:
> >>>
> >>> 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.

I just googled a list of public dns servers and tried several in a
row. They all showed the same problem suggesting that the problem is
local to me. Or, as I said, I happened to use only servers in the
broken subset of available public servers.

specifically, it was a series of edits to /etc/resolv.conf to point to
different servers and toggling the single-request option. 

regardless, it's nice to be snappy again. I didn't realise how
annoying it was...


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