ipsec does not support multicasts or broadcasts. Some vendors use their own methods eg checpoint "office mode" but as far s I know their is no support as yet for the client. However there is now support for site to site multicast support between cisco ios boxes
Sounds like you should configure NAT-T (nat traversal) this should be set up on the client and the concentrator. NAT-T wraps up all the ipsec in a TCP or UDP wrapper so you can use pat. It depends on what you are terminating the clients on (and the software version)
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