We want to configure a L2L-VPN with an ISA550 and a ASA5515X. The challenge is, that on the ASA side the subnet of the ISA side is in use. So we have to do a "NAT before VPN" on the ISA550 side to a transfer subnet The tunnel itself between the 2 firewalls is working fine, but I've difficulties with the NAT on the ISA550.
Here a short overview of the (planed) traffic flow between the subnets:
192.168.1.0/24 <--> ISA 550W <--> NAT to 10.11.14.0/24 <--> VPN-Tunnel <--> ASA 5515X <--> 10.11.12.0/24
So access from clients on the ISA-side 192.168.1.x to 10.11.12.0 have to be natted to 10.11.14.x and this traffic should be routed into the VPN-Tunnel. As I said, the tunnel (between 10.11.14.0/24 and 10.11.12.0/24) itself is up, but I have troubles configure this NAT.
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