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Date: Sun, 1 Sep 2013 05:09:12 -0700
Message-ID: <CAN0CFw1bPDDkGMGXBi7f3+VBD6kmuRTtkxTyHQNUm9kmVKgDgQ@mail.gmail.com>
Subject: Re: [gentoo-user] PMTUD
From: Grant <emailgrant@gmail.com>
To: Gentoo mailing list <gentoo-user@lists.gentoo.org>
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>> > If you are still troubled by the proxy connection stalling problem, have
>> > you tried transferring large files over the network using scp/sftp to
>> > see if you are also getting similar symptoms?  This would isolate it to
>> > the application level (squid) or if the problem remains would point to
>> > network configuration issues.
>>
>> How can I make this determination?  I'm testing a 50MB scp over hotel
>> wifi from my laptop to the remote proxy server now (with squid running
>> in case it matters) and it seems OK.  It oscillates constantly between
>> 0.0KB/s and 80.0KB/s.  As soon as I start browsing via the proxy
>> server, the upload frequently goes to "stalled" but I suppose that
>> could be a bandwidth issue.  Browsing still stalls before very long.
>
> The oscillation is related to buffering and is normal.  If you are getting
> longer stalling periods where no packets are being transmitted then there
> could be a network problem.  iptraf-ng, ntop and other tools can show if
> packets have stopped moving in either direction.
>
> From what you're describing the problem seems related to the squid
> application, since scp is not seeing similar timeouts.

Strangely, the ziproxy application behaves in exactly the same way.

- Grant