pppoe-passthrough-2.png
One use case, pppoe pass through, previously a common option on consumer home routers,
probably less so now when pppoe is less used.
Nice when your ISP would allow you to connect more than once using your credentials.
Your PC could (when necessary) get a routable IP on it directly, just by firing up a pppoe connection.
Filtering rules:
/interface bridge filter
add action=accept chain=forward in-interface=ether2 mac-protocol=\
pppoe-discovery
add action=accept chain=forward in-interface=ether3 mac-protocol=\
pppoe-discovery
add action=accept chain=forward in-interface=ether2 mac-protocol=pppoe
add action=accept chain=forward in-interface=ether3 mac-protocol=pppoe
add action=drop chain=forward in-interface=ether2
add action=drop chain=forward in-interface=ether3
I have another use case, trying to hide a bit from a bunch of IOT stuff, with
the IOT stuff likely having a different default gateway/dhcp server. I can see and connect to it
(It has more difficulty connecting to me) Though this still needs more thought, and maybe igmp proxy
would be an (better??) alternative to this.
I tried to join bridges as per @mkx, but it wouldn't let me :(
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