[pptp-server] pptpd through a cisco..?

[HiJinX]

Hi, I was wondering if it is possible to have a pptpd server (On a
Debian box), running on a 192.168 address behind a cisco801?
The client I'm testing with is a win2k - And it seems to be failing on
gre (input/output error)
Does anyone have a similiar solution working?

When the Debian box is on a live IP - The pptp connection can be made no
problems.

Thanks for any help,
Michael