L2TP over IPSec Multicast Tunneling

I'm currently trying to work through an L2TP over IPSec remote access setup using a Cisco ASA 5520. I'm able to successfully connect Windows 2000/XP clients, and various Linux distro clients. What I am having difficulty performing is the tunneling of multicast traffic (in the range of 239.0.0.0 to 239.255.255.255 for example). Multicast traffic does not flow down the established tunnel, but follows its physical interface connection instead.

Any thoughts?

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leecalcote
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