netfilter buglog - Jul 2013 - [Bug 779] Netfilter on bridge interface containing a defective NIC

https://bugzilla.netfilter.org/show_bug.cgi?id=779

--- Comment #4 from Phil Oester <netfilter at linuxace.com> 2013-07-11
23:30:36 CEST ---
(In reply to comment #3)
> Have you tried to replicate the problem with a defective NIC?  Here is an
> example of how to replicate the problem:
Well, that is difficult since I do not own defective nics.  But again: if your
NIC is defective, perhaps that is the real cause of your issue?  

I tested the exact scenario you describe by using e1000 nics in an eth1/eth2
bridge, and I manually disabled rx offload on eth2.  I could not see any
problem.
> observe simple ping traffic between:
>  1) computer attached to eth0 and computer attached to eth1.
>  2) computer attached to eth0 and computer attached to eth2.
> 
> enable netfilter (eg. use SNAT) & change IP addresses of computers as
necessary
> and repeat above observation.
What should I observe?  Does the ping not work at all in one or both of those
scenarios?  Which ones?  How are you seeing "corrupted packets"?

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