I forgot to post back saying that I got my 871w to finally connect to the internet. Now I'm trying to use the "vpdn enable" process to connect the MS PPTP vpn client to the router. This is easy on a pix 501 but it's confusing as sh*t on the new 12.4 IOS the 871w ships with. I've tried the various articles that come up but I'm getting the "verying username and password" which is generally an indicator the GRE is not in play.
How do I enable GRE to connect, if anyone knows?