I have found a guide on how to set up Net2Net tunnel between ASL and Zywall2 VPN gateway in www.astaro.com/kb. However I have a NAT router between the Zywall and the ISP and cannot get the VPN tunnel to work.
I have found out that the NAT router supports IPsec passthrough.
Problem seems to be that it isn't possible to define peer ID different from remote gateway IP on ASLv5 when using PSK.
In what order is VPN traffic and packet-filtering/NAT handeled on ASL? Maybe it's possible to fix problem with additional NAT functions, or traffic routing?
Thanks,
Michael
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