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'This is how to set up EoIP to bridge two (or more) Mikrotik router for central PPPoE authentication'

Using 2 routers called A and B that have an IP connection between them and B has 2 ethernet ports, i.e. you can ping B from A and A from B where the A facing eth port is called eth1 and its other port is called eth2.

1. create a new EoIP tunnel on A.
2. create a new EoIP tunnel on B, where the tunnel ID is the same as the one on A but the MAC addreses are different.
3. Add a PPPoE server to the EoIP interface on A.
4. create a new bridge on B and add eth2 and the EoIP tunnel to the bridge.
5. put an IP address onto eth2 (any address seems to work, but it maybe better to use a different subnet for routing purposes).

Now you should be able to extablish a PPPoE connection from a PC plugged into the eth2 port on router B, this PPPoE connection will terminate on router A.

This is not the most efficient method of using the available bandwidth on a network, but is perhaps easier than having a PPPoE A/C on every Mikrotik router and using RADIUS.