I have one subnet 192.168.2.0
I have two TZ190 routers with both WAN and OPT being assigned public IP's from 4 different providers.
TZ190 router 1 has a gateway of 192.168.2.1
TZ190 router 2 has a gateway of 192.168.2.2
Several servers on my LAN. some servers use 192.168.2.1 as the gateway and the router 1 has NAT policy's with ports for web server as an example
Several servers on my LAN use 192.168.2.2 as the gateway and the router 2 has NAT policys with web email servers as an example.
All i have is the two sonic walls and since they are both on the same subnet I have an ethernet cable going from router1 to router2. All my servers are pluged in to router 1 and I run vmware ESX.
Everything has been working fine for months. Suddenly, yesterday router 1 stopped responding and all the servers that were using that router went down. I logged in to one of the servers by coming in from router2 and did a continuous ping on router 1 192.168.2.1
It would stop responding for many pings and then would respond every 4th 8th ping with a long time like 800ms. I replaced the router with an exact one and imported the exact configuration and the problem was gone. Next day at 8:00 AM the issue kinda came back so rebooted the router this time and it went away. Same day at 5PM the router refused to respond and then I replaced it as well with a new one. This was 3 hrs ago and everything is fine. I'm terrified that since I don't know the root cause this issue will appear again. Just to recap this configuration and setup has been running the same way for months without an issue.