[qasdfdsaq]

I may be missing something here but I see no reason the VMB PPP and any other customer's VPN PPP would be treated any differently by the CMTS. In both cases it is simply encapsulated in IP packets that are destined for somewhere else and are thus passed somewhere else. The CMTS neither knows nor cares if it's PPP or what's in it.

If PPP traffic formulated in a certain way can disrupt VM's CMTS that makes for a glaring denial-of-service vulnerability.