IPsec with various subnets on one side

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http://serverfault.com – I have the following situation: Client subnet( /24)---->Router---->Internet---->ASA( /24)---->( /24)Gateway---->( /8)Many subnets I need to logically connect the client subnet to the "many subnets". On the left side I have a Cisco 2901 and on the other an ASA. I built an IPsec connection between the router and the ASA. The IPsec connection itself works but I cannot access any address behind the gateway. The local network of the IPsec connection is the /8 network. The ASA don't get it that it has to route the traffic through the gateway (172. (HowTos)