На 20.8.2010 г. 09:34, Eric Dumazet написа:

Le vendredi 20 août 2010 à 09:26 +0300, Plamen Petrov a écrit :

quoted

Posting this only in the hope that it will be helpfull to the
"net guys"...

Its a forwarding setup.

Please post

ifconfig -a
iptables -nvL
iptables -t nat -nvL
iptables -t mangle -nvL
ip route
ethtool -k eth0   (&  eth1 ...)

Try to disable gro ?
ethtool -K eth0 gro off
ethtool -K eth1 gro off

Sorry about this, but when I dig a bit into this, I found that
I had a pretty old ethtool:

root@fs:~# ethtool --help
ethtool version 5
Usage:
ethtool DEVNAME Display standard information about device
...

So my ethtool did not know anything about gro, because by
looking at
http://git.kernel.org/?p=network/ethtool/ethtool.git;a=shortlog
I saw I had this one:
2006-09-01	Jeff Garzik	Release version 5. origin v5
and gro reading/setting was added "a bit later"...
2009-03-06	Jeff Garzik	Get/set GRO settings.

So, I went on and compiled myself a new ethtool:

root@fs:~# ethtool -h
ethtool version 2.6.35
Usage:
ethtool DEVNAME Display standard information about device
...

And run it on my 2.6.34.4 kernel, which produced these:

root@fs:~# ethtool -k eth0

Offload parameters for eth0:
rx-checksumming: on
tx-checksumming: on
scatter-gather: on
tcp-segmentation-offload: off
udp-fragmentation-offload: off
generic-segmentation-offload: on
generic-receive-offload: off
large-receive-offload: off
ntuple-filters: off
receive-hashing: off

root@fs:~# ethtool -k eth1

Offload parameters for eth1:
rx-checksumming: on
tx-checksumming: on
scatter-gather: on
tcp-segmentation-offload: on
udp-fragmentation-offload: off
generic-segmentation-offload: on
generic-receive-offload: off
large-receive-offload: off
ntuple-filters: off
receive-hashing: off

root@fs:~# ethtool -k eth2

Offload parameters for eth2:
rx-checksumming: on
tx-checksumming: on
scatter-gather: on
tcp-segmentation-offload: off
udp-fragmentation-offload: off
generic-segmentation-offload: on
generic-receive-offload: off
large-receive-offload: off
ntuple-filters: off
receive-hashing: off

root@fs:~#

But again, this is on 2.6.34.4. Could it be that
"generic-receive-offload" is ON by default on my
only gigabit capable tg3 card on 2.6.35.x and later?

I will try to determine this myself later, but the
machine is a gateway on the local area network, and
is needed from the user here...

Thanks!