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l2tp tunnel. IPv6 inside IPv4 using Linux box.

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Last Modified: 2016-12-01
Hi Folks,
I'm working on a project, the goal is as follows and I have it working with IPv4.
PPPoE laptop client connected to Cisco router.
The Cisco is a LAC and when the PPPoE request is received it establishes a l2tp tunnel to a Linux LNS.
This box is running Ubuntu with OpenSwan, ppp and xl2tp. We don't have budget for this project to purchase another Cisco router so need to get it done using Linux box as a router. Its a physical server, not a VM.
The tunnel comes up and the client gets its IPv4 address from the LNS and all is good. The linux box has IPv4 forwarding turned on.

Now the main mission is to accomplish the above but the client must get an IPv6 address. The tunnel will be established using IPv4.
Appreciate any tips.

This is for lab tests not production.

Regards,
Q.
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