[pptp-server] GRE: Bad checksum from pppd ?

Frank Cusack fcusack at fcusack.com
Wed May 15 05:21:08 CDT 2002

On Mon, May 13, 2002 at 06:14:32PM -0700, Wylie Swanson wrote:
> I am not sure what is causing this problem or if "GRE: Bad checksum from
> pppd" is the terminating error.  This is running on a 2.4.18 patched
> kernel with mppe and mschap2 and PoPToP.  Authentication appears to be
> working, but the connection is lost immediately after successful
> authentication.

Try 'logfile /dev/null' in your options.pptp.  Then you'll see the
error is something else and you'll need to add 'debug' to find out what.
pppd writes some log stuff to stdout before LCP comes up which causes the
'bad checksum' (ignored by pptpd, but gives you a spurious error).


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