Strange problem with truncated responses when POSTing data

Kristian Lyngstol kristian at
Fri Oct 1 13:13:55 CEST 2010

On Fri, Oct 01, 2010 at 09:12:11AM +0200, Per Buer wrote:
> On Fri, Oct 1, 2010 at 12:09 AM, Eli Dickinson <eli at>wrote:
> > Today, though, I've been pulling my hair out with a strange problem
> > and I'm hoping someone here can help. I've got Varnish sitting in
> > front of Apache on one server and I've got a PHP script that POSTs
> > data from another server. If the length of the content I'm posting is
> > over about 1500 bytes, I get an incomplete response from Varnish.
> >
> This _might_ be a networking problem. I would guess that somehow you are
> using 802.1q tags and that some silly piece of network equipment throws away
> or mangles packets on one of your servers.

That's a very good point.

1500 is too close to typical MTU... Try setting the mtu on the server to
1400 for example?

- Kristian

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