Re: TCPv4 bad checksum

Shane Anderson (shane.anderson@infrasol.com)
Fri, 10 Apr 1998 14:10:30 -0600


On 10 Apr 98 at 16:22, Eloy A. Paris wrote:

> Hi,
>
> 2.1.92. I got several of these messages:
>
> TCPv4 bad checksum from 162.17.151.130:07d2 to 230.17.151.130:11ce,
> len=298/298/318
>
> 130.151.17.162 is connect to 130.151.17.230 via PPP (2.3pl3).
>
> I thought these message were gone...

And On 9 Apr 98 at 20:46, ramune@relaypoint.net wrote:

> Hi all,
>
> Uh... did someone screw up somewhere? Or am I missing
> something? These were in my logs (somewhat trimmed).
>
> [ same sorta thang... ]
>
> -- DN

I too have had similar problems in the past w/ PPP connections (and
IP Masq.) The best solution I found was to disable VJ compression on
the PPP link. I really wish this problem was solved, since w/ a 33.6
modem every % of bandwidth counts. BTW: The header is 20 bytes,
hence len=<num>/<same num>/<same num + 20> in the error message. So,
in short, try adding -vj to your pppd command line, or add -vj to the
/etc/ppp/options file.

Regards,

-= shane.anderson@infrasol.com ======== Infrared Solutions, Inc. =-

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