I'm running MacOS 10.4.8 with the latest Vmodem software for Intel Macs, and Cisco Systems VPN Client 4.9.00 (0050) with the following settings required to talk to the VPN srvers:
Enable Transparent Tunneling, IPSEC over UDP (NAT/PAT)
I don't have the option of chagning those settings on either server.
When I am using the Vodem the VPN client cannot make the connection to either server.
Both configurations work fine when I connect through satellite modem or DSL or university network.
Googling around, I see other people mention that they lose VPN when they use a Vodem, but I have seen no explanations about exactly what is going on, nor any suggestions to try.