Request for MPPE Source Code for PPPoE

I am trying to establish a link with a PPPoE Server running on windows and PPPoE Client running on a linux machine, MPPE 128 bit is negotiated successfully but when ping to the server, the client was unable to decypt the response causing in sending "unsupported protocol " messgae in protocol reject packet.

So as mikrotik uses MPPE encryption in linux successfully, how can i request the source (both kernel and pppd code)for that so that i can use it in my testing.

only a small number of things in RouterOS is based on open source code, you will not gain anything useful from the source code.