I'm experimenting with a multi-wan configuration for a boat where they have a variety of uplink options and a LAN with a few VLANs.
On the WAN side, they typically will have upstream routers for a satellite uplink, a wi-fi bridge, an LTE modem. In the past they have used a mechanical A-B-C switch to choose the uplink.
I would like to configure an ER with three (or more) WANs of which one or more may be active at any time. For example, the LAN might be 192.168.1.1/24, WAN1 192.168.89.X/24, WAN2 10.0.0.X/24, and WAN3 172.16.0.X/24. These ER IP on these WAN ports may be static or assigned by DHCP, but can probably be static if need be.
It would be okay to use a ping to something like 8.8.8.8 to detect which ports are valid for internet routing, but LAN devices would need to always be able to access the first hop router on any of the WAN ports. This is because they configure the uplink by logging into the router on that link, i.e., on WAN1 they would browse to http://192.168.89.1 to setup the wireless bridge when they arrive in a marina.
I've found this problematic on other routers because when a WAN is down, no traffic will route to that port at all, which blocks the ability to configure that uplink. It's just the default route(s) which need to change when an uplink is detected to be down.
I'm mostly wondering if this is possible before I dig into it.
Thanks, Barry
