I have a scenario where we have an 831 router at a remote location setup with ipsec and gre for multicast support back to our main site. Everything works great except we have a few clients that need to pptp to their own business server on the internet. TCP 1723 is working as we get the login but that is where the fun ends leaving me to believe GRE is not working for those clients. We are using PAT overload on the single address we have on the WAN interface. Is there a way to "allow GRE to pass through PAT"?
Thanks a million in advance for any info.