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Old 02-04-2015, 16:53   #120
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Re: Virgin Business Superhub now has Modem Mode

Quote:
Originally Posted by drsox View Post
I intend to go to site eventually and try and work out what this PPP l2TP stuff is about.. Can you even PPP and l2tp? Seems like their support department have got very confused over what you are supposed to setup.

PPPoE makes more sense to me.. l2tp doesn't.
PPPoE makes no sense to me, L2TP does. PPPoE makes sense on ADSL where it's (encapsulated) ethernet to the BRAS. VM doesn't give you an ethernet link to the VPN "server", the ethernet is terminated at the local CMTS, the remainder of the path being over VM's standard IP core.

---------- Post added at 16:53 ---------- Previous post was at 16:49 ----------

Quote:
Originally Posted by Ignitionnet View Post
The PPP session is encapsulated in L2TP to get from the CMTS to Virgin's BRAS.

PPPoE to the CMTS, which strips the 'oE' bit and puts the PPP session into its L2TP tunnel to the BRAS.
I suspect you're wrong and the Superhub directly creates the L2TP tunnel itself.


This is because a) if it were PPPoE to the CMTS, then there would be no reason for the Superhub to be issued a public routablle DHCP IP on it's cable interface and b) There are both PPP(non-oE) and L2TP up/down messages in the Superhub's local event log.
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