I've been working on creating a VPN for our office network and am running into some issues. I've got business-class internet on a Comcast-provided SMC8014 router with a static IP (x.x.x.206/30). I have DHCP on the router disabled, and Comcast has set it up for the closest thing to bridged you can get with this modem (a pseudo-bridged mode of sorts from what I've read). It's local IP is 10.1.10.1.
I've got a cable that runs from the modem into the first port of a WRT54g with DD-WRT v24-sp2 vpn installed. All of the other computers are plugged into a basic switch that's plugged into the WRT54g. DHCP is turned on and the router is assigning addresses correctly, we can get on the internet through it, etc etc. The local IP of the WRT54g is 10.1.10.2 with a gateway of 10.1.10.1. The WAN IP is x.x.x.205, subnet 255.255.255.252 and gateway x.x.x.206. According to Comcast (who I've called many many times), this is the correct setup. And that's where they always leave me--they're not allowed to go further than that.
The issue is that I can't even ping x.x.x.205. I can access x.x.x.206 from an external connection just fine, but not 205. ALL routing features on the modem are turned off, dhcp is off--I can't find a single reason why I wouldn't be able to access the Linksys from an outside connection.
Now the ultimate goal is to get OpenVPN working. All the certs and firewall stuff are plugged into DD-WRT and if something is wrong with the setup I feel like I could track the issues down and fix it, but none of that matters when you can't even ping the IP the client is supposed to connect to.
I'm really at a stand-still here. Any suggestions?