Does anyone know of a way to put layer 4 switching in front of a VPN client such that (for example) email and nntp dont get tunnelled while everything else does, or vice-versa? We're probably talking Windows software here I know...... Jon.
The VPN solutions I have used (e.g. Bay Networks, MS PPTP) send *every* packet from the end user machine to the VPN end-point, not just selected packets (like with SSH tunneling). If you want a commercial solution that does selective tunnelling - the FW-1 addin (VPN-1) exports a "topography" file to the client at setup; this really consists of a list of subnets that the VPN will handle, and is set at the server side. anything not on the topography list goes out via the dialup adaptor or network card as normal.