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From: =?ISO-8859-1?Q?Olivier_Cochard=2DLabb=E9?= <olivier@cochard.me>
Date: Wed, 27 Aug 2014 01:16:57 +0200
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Subject: Re: 9.3 RELEASE not forwarding pkt-gen (netmap) packets over XenServer
To: Raimundo Santos <raitech@gmail.com>
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On Tue, Aug 26, 2014 at 9:35 PM, Raimundo Santos <raitech@gmail.com> wrote:

>
> 15:38:13.286119 00:1b:21:53:51:3d > 00:1b:21:53:51:39, ethertype IPv4
> (0x0800), length 60: (tos 0x10, ttl 64, id 0, offset 0, flags [DF], proto
> UDP (17), length 46, bad cksum 6605 (->6604)!)
>
>     10.0.0.1.0 > 192.168.10.2.0: [bad udp cksum 0x5e7c -> 0x5e7b!] UDP,
> length 18
>
>
Hi,

the bad UDP checksum seems related to this pkt-gen bug:
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=187149

pkt-gen one checksum for all the paquets it generate (then once it update
the IP or port, the checksum didn't match).
Applying the patch correctly update the checksum for all paquets (but it
have a performance impact).

Regards,

Olivier