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This is easier to do via source IP policy-based routing if you have a static IP, but this way you don't need to hardcode the IP anywhere, for dynamic cases. If you have multiple such interfaces then maybe connmark stuff on the way in.
Note: the routing table your fwmark gets pointed at needs to have the default route to the relevant interface (no need for static IPs if it's p2p like PPPoE, since that's interface only), and also your local subnet to its interface, else the 3rd packet onwards will hairpin.
Update: though the above does work for general Linux routers, it disables hwnat acceleration on the EdgeRouter-X. This doesn't: iptables -t mangle -A PREROUTING -j CONNMARK --restore-mark iptables -t mangle -A PREROUTING -i pppoe0 -m state --state new -j CONNMARK --set-mark 10
Incidentally, even though the Ralink hw_nat module is open source (the Cavium equivalent isn't...), I haven't been able to find where in the code it determines what firewall rules disable the fastpath. Still looking...
Check out master device a.k.a. l3mdev as it helps with this and avoids the need to manually mark the packets. It reuses the same routing tables you’re using. Just with a lot more aotumagic to make things simpler.
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