Re: "TCPv4 bad checksum" errors: a little more debugging

Shaw Carruthers (
Sat, 5 Dec 1998 20:16:29 +0000 (GMT)

It is believed that there is a problem with the Ascends that Demon use
which leads to checksum errors. The Ascends have a fixed buffer of about
16k per connected user. If you advertise a large receive window, the
buffer can overrun and packets get dropped which screws the VJ
compression. I use a window of 7k which reduces the problem.

Note: the single Ascend buffer has to handle multiple TCP streams to you.

There is also another problem as I get checksum errors with novj, but far
less often.

Shaw Carruthers -
London SW14 7JW UK
This is not a sig( with homage to Magritte).

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