User`s guide

Chapter 10 IPSec VPN Config Screens
LAN-Cell 2 User’s Guide
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Virtual Address Mapping
Virtual address mapping (NAT over IPSec) changes the source IP addresses of packets from
your local devices to virtual IP addresses before sending them through the VPN tunnel.
Avoiding Overlapping Local And Remote Network IP Addresses
If both IPSec routers support virtual address mapping, you can access devices on both
networks, even if their IP addresses overlap. You map the LAN-Cell’s local network addresses
to virtual IP addresses and map the remote IPSec router’s local IP addresses to other
(nonoverlapping) virtual IP addresses.
The following diagram shows an example of using virutal address mapping to avoid
overlapping local and remote IP addresses. You can set up virtual address mapping on both
IPSec routers to allow computers on network X to access network X and network Y computers
with the same IP address.
• You set LAN-Cell A to change the source IP addresses of packets from local network
X (192.168.1.2 to 192.168.1.4) to virtual IP addresses 10.0.0.2 to 10.0.0.4 before
sending them through the VPN tunnel.
• You set LAN-Cell B to change the source IP addresses of packets from the remote
network Y (192.168.1.2 to 192.168.1.27) to virtual IP addresses 172.21.2.2 to
172.21.2.27 before sending them through the VPN tunnel.
• On LAN-Cell A, you specify 172.21.2.2 to 172.21.2.27 as the remote network. On
LAN-Cell B, you specify 10.0.0.2 to 10.0.0.4 as the remote network.
Figure 153 Virtual Mapping of Local and Remote Network IP Addresses
Computers on network X use IP addresses 192.168.1.2 to 192.168.1.4 to access local network
devices and IP addresses 172.21.2.2 to 172.21.2.27 to access the remote network devices.
Computers on network Y use IP addresses 192.168.1.2 to 192.168.1.27 to access local
network devices and IP addresses 10.0.0.2 to 10.0.0.4 to access the remote network devices.