Configure Cisco Easy VPN Remote for Access Routers
Task 1 – configure the DHCP server pool

To use the DHCP server of the local router to assign IP addresses to the hosts that are connected to the LAN interface of the router, a pool of IP addresses must be created for the internal DHCP server . The DHCP server then assigns an IP address from this pool to each host when it connects to the router.

In a typical VPN connection, the hosts connected to the LAN interface of the router are assigned an IP address in a private address space. The router then uses NAT/PAT to translate those IP addresses into a single IP address that is transmitted across the VPN tunnel connection.

The following steps are used to create the DHCP server pool:

Step 1
Create a DHCP server address pool using the ip dhcp pool pool-name command. This places the administrator in DHCP pool configuration mode.

Step 2
Use the network command to specify the IP network and subnet mask of the address pool that will be used by the hosts connected to the local Ethernet interface of the router.

Step 3
Use the default-router command to specify the IP address of the default router for a DHCP client. At least one address must be specified. Up to eight addresses can be specified per command.

Step 4
Use the import all command to ensure that the router is configured with the proper DHCP parameters from the central DHCP server. This option requires a central DHCP server be configured to provide the DHCP options. This server can be on a different subnet or network.

Step 5
The lease command is optional. Use this command to specify the duration of the DHCP lease. Use the exit command to leave the DHCP pool configuration mode.

Step 6
Use the ip dhcp excluded-address command to exclude the specified address from the DHCP server pool. The lan-ip-address should be the IP address assigned to the LAN interface of the router.

One example of a DHCP server pool configuration is shown in Figure .