Authentication Tab of the VPN Client Properties Window
The Transport tab in the VPN Client Properties window enables you to configure the
transparent tunneling properties for the VPN connection (see Figure 14-10). Transparent
tunneling enables your VPN connection to travel across devices that are performing NAT or
PAT on the traffic. Without transparent tunneling, the traffic would be considered invalid
because the integrity checks on the packets would fail.
The Backup Servers tab of the VPN Client Properties window defines backup Easy VPN
Servers (see Figure 14-11), and the Dial-Up tab of the VPN Client Properties window defines
whether the connection to the Internet using dialup networking is enabled (see Figure 14-12).
An enterprise network may have multiple Easy VPN Servers. Backup servers for the
connections enable your Cisco VPN Clients to utilize these alternate Easy VPN Servers if the
primary Easy VPN Server is unavailable. When establishing a VPN connection, clients
attempt to connect to the primary Easy VPN Server first. If that device is unavailable, one of
the backup servers will be used.
NOTE You also can configure the backup servers on the Easy VPN Server and have them
pushed to the VPN Client after a successful connection. Then, on subsequent connections,
the VPN Client can use these backup servers if the primary server is unavailable.