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Alright, FIB is too complex for me.

I think I'll just deploy five OpenWrt instances to handle the PPPoE dialing
then connect them to OPNsense.

Thanks for all the replies!

Hi,

I have 5 PPPoE lines from the same ISP.

After binding them to different interfaces on OPNsense and dialing each up separately, they obtain different IP addresses (all with 32-bit subnets) but the same gateway.

I configured unique monitor IPs for each gateway in the Gateway settings, and now the gateway status (including probe latency and packet loss) shows normal for all.

I also set up individual SNAT rules for each interface—with source/destination addresses set to "any", IPv4 protocol, and translation to the outgoing interface's IP.

However, when I create rules in Firewall -> Rules -> LAN and specify a gateway, only the rule pointing to the first PPPoE gateway works; the others fail to connect.

I've been using this exact setup on pfSense without issues for years. The key was just setting unique monitor IPs. But it seems this doesn't work on OPNsense?

Did I miss something crucial, or is this not supported on OPNsense? Are there any alternative workarounds?

Thanks!