Re: Bridged networking broken ? (was: Xen works fine)

[Anton Titov <a.titov@host.bg>]

Actually I've had this problem too, on Gentoo, which comes more or less 
with no packages preinstalled. My network scripts was failing silently 
too and as the server was in colo, the quick solution I found was to 
bring xen-br0 up manually with:

  ifconfig eth0 0.0.0.0 promisc up
  brctl addbr xen-br0
  brctl setfd xen-br0 1
  brctl sethello xen-br0 1
  brctl stp xen-br0 off
  brctl addif xen-br0 eth0
  ifconfig xen-br0 ................. up
  route add default gw ...................

Actually I had very bad problem with machine dropping packets in peak 
hours /~10Mbit network traffic from pages, no big downloads/. I was seening:
Feb 13 22:36:58 carrier ip_conntrack: table full, dropping packet.

in the kernel log all the time, also netstat was reporting many times 
more open connections that was the number of apache processes. I've 
found that there is a bug in connection tracking code, introduced in 
2.6.10 /not sure, but was a recent bug/, I've found a patch for this 
problem, but I was not feeling like patching, recompiling and rebooting 
in peak hours, so I've solved the problem with:

echo 131072 > /proc/sys/net/ipv4/ip_conntrack_max

Hope this helps somebody.

Also does anybody here know about this problem and if it is fixed in xen 
2.0.5, as it is 2.6.10 based too?

Anton Titov


Harry Butterworth wrote:

>I've used 2.0.4 on Sarge and the only problem I had was that the
>networking scripts fail silently if the 'ip' command is not installed.
>Make sure you have it by installing the package iproute.
>
>Harry.
>
>
>
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