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 From:  Andreas Ferrari <aferrari at stasoft dot ch>
 To:  "Neil A. Hillard" <m0n0 at dana dot org dot uk>
 Cc:  m0n0wall at lists dot m0n0 dot ch
 Subject:  Re: [m0n0wall] bad tcp cksum
 Date:  Wed, 04 Oct 2006 12:06:04 +0200
 > This is probably a red herring.
Thanks for your answer....

Dou you think i will report something that i have dreamd?

The fact is that it still not working, I tried lowering the mtu without 
So if you or someone have any ideas what there could be wrong please 
give me a hint.

Neil A. Hillard schrieb:
> Hi,
>         I've been away for a while and haven't seen a response to this
> but apologies if I've missed it.
> In message <451A397A dot 8010006 at stasoft dot ch>, Andreas Ferrari
> <aferrari at stasoft dot ch> writes
>>One of our customer has a VPN from his home office (wrap+m0n0 ver 1.22)
>>to his office (wrap+m0n0 ver 1.22), that works fine. When he tries to
>>send a mail from home over the VPN to the postfix server then the mail
>>is never delivered to the mailserver.
>>I noticed that small plaintext messages can be delivered to the postfix
>>server but if the mail gets bigger then only the first part of the data
>>are sent.
>>On the mailserver i started tcpdump and could see that the mail could
>>not be sent because there are a lot of bad tcp cksum messages.
>>So the mailserver gets the first part right and the rest of the data
>>are bad. How could that happend?
> This is probably a red herring.  I suspect that you'll find that this is
> due to TCP Checksum Offloading.  I spent a couple of days chasing what I
> thought were problems cause by this - turns out it was something else.
> HTH,
>                                 Neil.

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