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On Fri, 20 Jul 2007, Jesse Cantara wrote:
Hi Jesse,
Thanks for the complete problem report. I'm leaving
your whole post here so Julian sees it.
> Hello,
Hi Julian,
Is this a problem with the masquerading code below
ip_vs()? If so it seems hard to imagine no-one else has seen
it.
> I'm trying to figure out a problem I'm having with my LVS-NAT setup.
> It's a very simple setup, one director, two networks (director has two
> nics, one on lan one on internet), three webservers on LAN only on port
> 80. The issue I'm having is occasionally and randomly the director will
> apparently just sever the connection when trying to download a file from
> the webserver. I have performed these tests just fine without issue:
> 1) Downloading a file directly from the director to a client
> 2) Downloading a file from the webserver to the director
>
> So it would appear that the physical connection is OK, I can make
> connections to the individual machines without problem, just when
> connecting through the director to the webserver.
>
> What happens is I will be downloading a file, and it will hang (at
> random points during the download, sometimes not at all), and not continue.
>
> ipvsadm will show "ESTABLISHED" on that connection for quite a long
> time, then "ERR!" after it times out I believe.
>
> Watching the traffic on a packet-sniffer client-side shows that directly
> before the failure, my client keeps sending the same "ack" message back
> to the server over and over, and the server appears to not recognize it.
we had a problem a little like that a while ago and I can't
remember if it was fixed or not (most likley we didn't fix
it).
> It must be related, but it makes me question where the problem is: the
> exact same sort of problem happens when I set up IPTABLES to forward a
> port on the director to one of the webservers directly. I'm not sure if
> I'm barking up the wrong tree asking on this mailing list, but hopefully
> somebody has run into something similar before, or can at least point me
> in the right direction :)
no this is the place to ask.
Joe
>
> Here is the config of my machines:
> CentOS 5
> latest kernel 2.6.18-8.1.8.el5
> ipvsadm v1.24
> IPVS v1.2.0
>
> I'm not doing anything "fancy" with the webserver, just downloading a
> large file for test, from apache. Like I said, the webservers work fine
> when accessing not through the director.
>
> If there's anything I have missed, I apologize. Please let me know
> anything else that I should provide for information.
>
> Thanks in advance,
> -Jesse
>
>
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>
--
Joseph Mack NA3T EME(B,D), FM05lw North Carolina
jmack (at) wm7d (dot) net - azimuthal equidistant map
generator at http://www.wm7d.net/azproj.shtml
Homepage http://www.austintek.com/ It's GNU/Linux!
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