Penetration Testing: PPP authentication brute-force attack?

[Matheus Michels <matheusf_michels () hotmail com>]

Does anybody know a tool to perform brute force or dictionary attacks against a PPP (PAP and/or CHAP) authentication 
server? Yes, I'm very familiar with Hydra, but neither it nor Medusa have support for PPP.

I know that such a tool would actually call pppd to perform the attack. So, I even tried to write a shell script to 
read passwords from a file and call pppd for each one, but as I'm a very bad programmer I could not make nothing useful 
:(

In my case, I'm trying to audit an PPPoE PAP server.

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