We have a Netgear DG834 router, connected to the wan port on an Instagate EX2 firewall/mail server.
The problem I am having is that I cannot VPN the Instagate system from the Internet (i.e. passing through the router). I have removed the router and VPN'd straight in to the Instagate by assigning the router IP to a laptop - this worked fine, so there is clearly nothing wrong with the wan port on the firewall.
I assume therefore that it is more likely to be a problem with the Netgear router (rather than the ISP). Incidentally, nat is switched off on the router, and it DMZ's to the Instagate (we then use this as our gateway and 2ndary DNS server). There are no blocking rules set on the router either.
Firmware version is 3.01.25 by the way.
Any ideas? I could really do with vpn'ing this box!