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ACS 5.5 PPP Help

Hi, ACS 5.5 has me stumped. What I am trying to do is pretty simple and already working using ACS 4.2 but I am having trouble finding how to achieve the same in 5.5.

We have a number of 800 series routers that connect over PPP through L2TP tunnels. ACS 4 is doing the following

1. Sends the L2TP tunnel parameters to the telco's LAC (via their RADIUS server)

2. authenticates the 800 PPP sessions using CHAP.

2. Sends an IP address to the 800

3. Sends  a static route to the central LNS via an AV-pair.

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