Our organisation uses the PPTP variant of remote access VPN (via a Microsoft 2000 server). Our remote users are given cisco 827, 837 and most recently 877 routers for their remote access into the network via the Internet.
What we've noticed is that PPTP pass through in at least IOS versions 12.3(8YI3) and up (including all the versions in 12.4 stream) does not work.
This has forced us to delay purchasing additional 857 and 877's for our remote users. On the other hand the 827 and 837 with lower IOS versions do not exhibit the problem.
Can someone from Cisco shed some light on this?