Good day,

i want to be able to dial a pppoe connection on my windows pc behind my mikrotik router.
But when i try to the pc gives and error and it cant connect to it.

How do i allow this?

mikrotik is just a simple nat router

Thanks

between a pppoe client and a pppoe server you must have a L2 connectivity, you cannot have a router.
you have two solutions:
1. configure the pppoe cliente in the routerboard (preferred)
2. create a bridge from the two router ports used and leave windows to create pppoe connection