How to configure backend router for 6852ac gateway
I'm trying to get my network back up after a failure. The failure happened when AT&T tech support mucked with my configuration to fix my non-working WiFi. Here's my configuration:
AT&T fiber connection -> 6852 Gateway -> CISCO RVS4000 router -> User machines and servers.
I have a block of 8 static IP addresses 76.x.x.24 thru 76.x.x.31. The RVS4000 is used for NAT.
My problem is that I can't connect to the servers from the internet anymore. I can however initiate outbound connections, e.g. web browsing. Everything had been working perfectly for almost 2 years.
Currently, on the 6852,
Settings->Broadband->SupplementaryNetwork->AddAdditionalNetwork is set to 76.x.x.30 subnet 255.255.255.248.
Is this correct?
On the RVS4000, the WAN connection type is set to DHCP. This seems mildly wrong to me. I tried setting the WAN IP to static and matching the first usable static IP namely 76.x.x.25. That just made things worse.
So, in summary, my question is: What addresses do I use for
(1) the "Additional Network" on the 6852, and
(2) the WAN address of the RVS4000?