Yes, you can achieve failover without CARP in a WAN environment.
Yes, you can achieve failover without CARP in a WAN environment.
Hi community, I'm currently developing a private network project and facing a challenge. I need a redundant OPNSENSE cluster with dual WAN configurations. My setup uses a modem for each connection—one receives DHCP, another requires PPPOE login. I have only one public IP from my ISP. I can create CARP IPs on my LAN networks, but the main concern is enabling failover without using a CARP IP on the WAN side. Buying another multi-WAN router would add complexity with double NAT and still risk a single point of failure. Using two switches that support LAGG/LACP might work, allowing failover between them based on network conditions. If one modem fails, the system should detect it and switch to the other modem. The same logic could apply to the WAN side. Am I missing something, or would this approach function without relying on WAN-CARP? It seems like a potential workaround, but I’d appreciate your thoughts.