[pptp-server] PPTP Choke - GRE: Bad checksum from pppd

[linux at orgx.co.nz]

Well, in keeping with my wrong initial guesses at my previous problem, it 
seems I have done it again.  After pointing the finger at pppd and/or the 
kernel for this problem I just thought I'd try PPTP 1.1.1 (was using 
1.0.0).  And initial tests how that all is well!  So I guess the problem 
was in the comms between pptpd and pppd, since pptpd was still talking to 
my Win98 box, but no tcp connection was alive.  Now v1.1.1 seems to be 
roaring along - several MB without stopping...And no syslog errors from 
pppd or pptpd.  Hope this may be useful to some others too...

Cheers,

Richard Shepherd





linux at orgx.co.nz
Sent by: pptp-server-admin at lists.schulte.org
05/14/00 10:47 AM

 
        To:     pptp-server at lists.schulte.org
        cc: 
        Subject:        [pptp-server] PPTP Choke - GRE: Bad checksum from pppd


After getting over the NTDOMAIN\\username problem with authentication,  I 
now have a nastier problem.  I can happily establish a PPTP session from 
my Win98 box to my Linux box.  I begin transferring some data with FTP 
(for example).  I get about 800KB (this figure varies I think) done and 
then it chokes.  The bytes received stops incrementing and in my syslog I 
see: 

May 13 21:35:33 bts pptpd[8590]: GRE: Bad checksum from pppd.   
May 13 21:35:46 bts last message repeated 23 times 

I cannot ping from client to server anymore.  It's as if someone's cut the 
line.  And a few seconds later another block of these.  So I guess this is 
a problem with pppd or the kernel right?  I have kernel 2.2.14, pppd 
2.3.10 with the ppp-2.3.10-openssl-norc4-mppe.patch applied to pppd and 
kernel.  This seems like something nasty that I don't know what to do 
about.  Normally if I hit something like this I'd try to upgrade the 
kernel.  But 2.2.14 is sufficiently up-to-date and I presume many others 
are happily using it. 
.
.
.
Cheers,

Richard Shepherd
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