NetworkManager-vpnc plugin doesn't support vpnc's "--disable-natt" option, would be great to have it, seems like similar issue described here https://launchpad.net/ubuntu/+source/network-manager-vpnc/+bug/88073
I have a patch ready. I looked at the Ubuntu patch and *cough* fixed it, added better spacing in the glade file to make it look more like a Gnome control panel. I also added a field for the NAT Keepalive value. Testing welcomed, especially around the import/export features. David, Dan, if you would kindly review the GUI modifications (nm-vpn-properties) and comment, to know whether i should submit this upstream. src rpm (for FC-6 & FC-7) is here : http://www.poolshark.org/src/NetworkManager-vpnc-0.6.4-3.fc6.src.rpm
Built for FC-6 and FC-7.