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Cisco Router and Security Device Manager Version 2.2 User’s Guide
OL-4015-08
Chapter8 Site-to-Site VPN
Create Site to Site VPN
Details
Click to obtain details about the interface that you selected. The details window
shows any access rules, IPSec policies, NAT rules, or Inspection rules associated
with the interface. If a NAT rule has been applied to this interface that causes the
address to be unroutable, the tunnel will not operate properly. To examine any of
these rules in more detail, go to Additional Tasks/ACL Editor and examine the in
the Rules window.

Tunnel Destination

Enter the IP address of the interface on the remote router at the other end of the
tunnel. This is the source interface from the point of view of the other end of the
tunnel.
Make sure that this address is reachable by using the ping command. The ping
command is available from the Tools menu. If the destination address cannot be
reached, the tunnel will not be created properly.

IP Address of the GRE tunnel

Enter the IP address of the tunnel. The IP addresses of b oth ends of the tunnel
must be in the same subnet. The tunnel is given a separate IP address so that it can
be a private address, if necessary.
IP Address
Enter the IP address of the tunnel in dotted decimal format. For more information,
see IP Addresses and Subnet Masks.
Subnet Mask
Enter the subnet mask for the tunnel address in dotted decimal format.
VPN Authentication Information
VPN peers use a pre-shared key to authenticate connections from each other. This
key must be the same on each side of the VPN connection.