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
>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.
Neil A. Hillard E-Mail: m0n0 at dana dot org dot uk