Duh. Thank you. =) Sometimes you need someone to point out the obvious. I already had a rule to drop invalid connections but it was in the wrong place. Everything is working properly after relocating it.Drop invalid packets in firewall.
I'm with Teksavvy, and they provide MLPPP service. I would love to test and get support for this. I'll email support.if somebody can give us access to a client whos ISP supports these features, we can try to add them