using FreeBSD as a pppoed server

I'm trying to use a FreeBSD computer plugged into a linksys adsl router to connect to another FreeBSD computer plugged into the wan port of the same linksys router. I printed out the pppoed man page but it's not very comprehensive. I looked on the web as well but only found links on using pppoe as a client. Does anyone have any idea how to do this?
 
The WAN port on an ADSL router isn't ethernet. It uses the same RJ-45 connector but it certainly isn't ethernet.
 
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