Linux and Cisco IPsec VPNs

Many corporate LAN users are familiar with Cisco VPNs. Cisco VPNs depend on IPSec servers and have a linux client called VPNC. VPNC allows VPN connections via linux and is bleeding edge software. This means that if you are not running the unstable version of your distribution, there is a good chance that you will have to install two libraries in order to force your distribution into working order with VPNC. Not very difficult for an intermediate Linux user, but forewarning that there needs to be a small bit of tweaking.