BT Home Hub 3 and Cisco VPN - Clamp Those Ports, Baby

This morning, I was struggling to get a Cisco VPN client ( Version 5.0.07.0410 ) to connect to its target VPN server, even though I'd previously used it - ON A DIFFERENT NETWORK.

Thanks to a quick Google search, I found reference to a Port Clamping setting within my BT Home Hub's configuration screen: -

Once I enabled this ( no restart required ), it worked like a dream, and I was up and running in no time at all.

Thanks, Google :-)