I posted a similar msg to port-mac68k, pardon the cross-post, but this 
seems the more appropriate forum...

I've set up IPNAT on my NetBSD-mac68k box for my home office LAN (win95, 
NT server 3.51, powermac, 68k-mac), and it works like a charm. The only 
thing I can't do (and need to) is connect to a MS PPTP server from my 
Win95 (ugh) machine. I get some LCP transactions, and then it falls down. 
There's precious little debug info on the client side of MS-PPTP, so I'm 
not sure what the problem is. From what I've read, it looks like ipnat 
won't handle the GRE-encapsulated packets that PPTP uses.

I could upgrade NT server to 4.0 and install steelhead, but I'd rather 
support NetBSD than the M$ empire :)

Is anyone aware of any work being done to support PPTP via IPNAT (or even 
interest in it)? Looks like the Linux folks have managed it: 

<http://www.wolfenet.com/~jhardin/ip_masq_pptp.html>, 
<http://bmrc.berkeley.edu/people/chaffee/linux_pptp.html>

I'd love to hack on this myself, but I doubt I'd accomplish it in my 
lifetime (I'm not a programmer - the last I did was fortran on a 
Burroughs B6800) :( But I'll contribute whatever I can - research, 
testing...

mark