[ECOS] telnet in redboot

Jonathan Larmour jifl@eCosCentric.com
Fri Jan 24 04:52:00 GMT 2003

Cho JinJe wrote:
> below is tcpdump message:
> what does 'bad tcp cksum 20!' mean?

It means the TCP checksum was bad, which might indicate some sort of
software _or_ hardware glitch.

You should investigate for yourself whether the target thinks it's sending
exactly the same thing as your host is receiving. Do this by comparing the
packet dump you already have from the target with tcpdump -x. In
particular you could work out from the headers which bytes correspond to
the TCP checksum. That way you can see if it is in fact the TCP checksum
algorithm that is failing.

More likely is it's some other more general type of corruption.

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