Cable Forum - View Single Post - Superhub Virgin Business Superhub now has Modem Mode

Ignitionnet · 03-11-2014, 20:05

The L2TP tunnel is from the CMTS back to a BRAS / LNS. The connection between CPE and CMTS is PPPoE.

L2TP is pretty basic and lacks the functionality needed for this; it is there to extend layer 2 networks, not for what is essentially emulating a dial-up connection over an IP network.

When you use an 'L2TP' or 'PPTP' VPN, the payload inside the L2TP / PPTP frame is PPP.

L2TP is for joining layer 2 networks across a layer 3 network. Great for making a PPP session think it's directly connected to a BRAS across an IP network, not so good for connecting a CPE to a VPDN.

03-11-2014, 20:05	#23
Ignitionnet Inactive Join Date: Jun 2008 Location: Leeds, West Yorkshire Age: 47 Posts: 13,995	Re: Virgin Business Superhub now has Modem Mode The L2TP tunnel is from the CMTS back to a BRAS / LNS. The connection between CPE and CMTS is PPPoE. L2TP is pretty basic and lacks the functionality needed for this; it is there to extend layer 2 networks, not for what is essentially emulating a dial-up connection over an IP network. When you use an 'L2TP' or 'PPTP' VPN, the payload inside the L2TP / PPTP frame is PPP. L2TP is for joining layer 2 networks across a layer 3 network. Great for making a PPP session think it's directly connected to a BRAS across an IP network, not so good for connecting a CPE to a VPDN.