For IPCOP versions above v1.3, IPSEC VPN passthrough should work out of the box. As you have confirmed, the VPN worked great until the upgrade. I'm not familiar with the Cisco VPN client, but maybe someone who uses it regularly may be able to shed some more light on any changes in the new version.
Re: cisco vpn client behind ipcop
13 years 1 month ago #12937