lkml.org 
[lkml]   [2006]   [Oct]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Networking messed up, bad checksum, incorrect length
Herbert Xu escribió:

> These packets look like normal TSO packets. Linux will send a
> packet containing more data than fits in a packet to the NIC. The
> NIC will then segment the packet for us.
>
> If that is not possible, you can try disabling TSO with ethtool -K.

I see...
I have tracked the change to 2.6.18.
Using kernel 2.6.17.14 and below makes tcpdump/libpcap to display the
real packets.
Could this be a change in the tg3 driver to support TSO committed in 2.6.18?

And a question... how this TSO affects netfilter?

> In order to see what really goes out, you'll need to run a packet
> dump beyond the NIC.

They are here:

Sniffer traces taken through port mirroring in the switch
(ethereal with filter: host flash.cnio.es):
http://www.nimastelecom.com/smtptraces/smtptrace_portmirror.pcap


But still wondering how could this affect Netfilter... my real problem
is that Netfilter drops ACK packets because it doesn't see the
connection established/related.

I will try to do some more research.

Regards,
Carlos Velasco
CCNP & CCDP Cisco Certified Network Professional


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2006-10-27 05:53    [W:0.034 / U:0.200 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site