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From "Jeroen Massar" <jer...@unfix.org>
Subject RE: Linux + TCP_CORK + IPv6 = Broken
Date Tue, 03 Dec 2002 22:33:27 GMT
Colm MacCarthaigh [mailto:colm.maccarthaigh@heanet.ie] wrote:

> On Mon, Dec 02, 2002 at 02:48:53PM -0500, Jeff Trawick wrote:
> > Colm MacCarthaigh <colm.maccarthaigh@heanet.ie> writes:
> > 
> > > Linux (2.4.18 and 2.4.19, for me anyway) with apache versions
> > > 2.0.40 to 2.0.43 (that I've tested anyways) is broken with
> > > TCP_CORK and IPv6. Bizarrely v6 requests will work the first
> > > few times and then start failing, typically you just wont get
> > > a response from the server. Though strace shows that it did
> > > try to send one.

Another 'fun' thing:
 - Linux 2.4.18
 - Apache 2.0.43 (preforked)
 - Debian unstable

http://www.sixxs.net
 - IPv4 works
 - IPv6 doesn't work

https://www.sixxs.net
 - IPv4 works
 - IPv6 works

So I have currently installed a default reroute on http://www.sixxs.net
for IPv6 requests
to redirect them to the https:// variant. Try
http://www.ipv6.sixxs.net/news/ for example
to not get redirected (only a IPv6 non-ssl / request redirs).
btw www.ipv4.sixxs.net has only A, www.ipv6.sixxs.net has only AAAA.

The "IPv6 doesn't work" actually means: request comes in, answer comes
out partially.
A first request gets returned correctly any pipelined request coming in
next fail.
That's why the / works (as it's only 1 answer, not pipelined) some other
pages without
pictures show this too.

Odd that IPv4 and SSL'd IPv4/IPv6 do work.

Another thing is that I do got it working on other boxes with 2.4.18 :)
Same build of apache on those, other NIC's though:
2.4.18 - purgatory.unfix.org (HTTP and HTTPS IPv4 and IPv6 ofcourse)
2.4.19-pre5-ac3 - games.concepts.nl (HTTP IPv4 and IPv6)

Oddness all around, but maybe that problem is related?

Greets,
 Jeroen



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