There are a number of other posts with similar questions, but none that I found were able to help me.
When you get a business line from Comcast they give you an SMC router/firewall/modem. Before switching to Comcast business, we had a SonicWall firewall configured and working perfectly for our previous ISP. It allowed inbound terminal services to our terminal services server and OWA (http/https) connections to our exchange server.
Now that I have to place this SMC router in front of the firewall, I'm in a situation where getting the double NAT'ed firewalls working is not as simple as I had hoped.
I know the setup below is wrong because although I have internet access from behind the SonicWall, I can't get in from the outside using services that previously worked (OWA and terminal services).
Comcast wrote down two IPs on the work order:
So this is my setup on the SonicWall:
WAN: NAT-Enabled Static IP: 173.xxx.xxx.205/24
LAN IP: 10.1.10.1/24
WAN IP: 173.xxx.xxx.206
Static IP Block 173.xxx.xxx.206/30
"Firewall for True Static IP Subnet Only" disabled
"Gateway Smart Packet Detection" disabled
"Static Routing" disabled
"Port Forwarding" disabled
"1 to 1 NAT" disabled
173.xxx.xxx.205 is in the DMZ (I was trying to achieve a "bridge-like" mode even though this device doesn't have a bridge mode)
When I check my public IP from behind the SonicWall, it's currently 173.xxx.xxx.205
What do I need to change for this to work properly?