[pptp-server] GRE: Bad checksum from pppd

[Joshua Nekl]

Well, we got the problem solved. Just thought I'd post the 
solution for everyone else to reference.

The only difference from this server compared to all our other
servers is that this one has dual PIII's.

After exhausing all other possibilities, I re-compiled the kernel
without SMP processor support, and downgraded the processor
selection from P-Pro to a regular Pentium.

Everything is working flawlessly now, even though I hate
having an extra processor sitting in there doing nothing.


Joshua Nekl