Sample Implementation on Two Gateways
Chapter 8: Configuring High Availability 251
Gateway A Gateway B
DMZ Network IP Address 192.169.101.1 192.169.101.2
DMZ Network
Subnet Mask
255.255.255.0 255.255.255.0
The gateways have two internal networks in common, LAN and DMZ. This means that
you can configure HA for the LAN network, the DMZ network, or both. You can use
either of the networks as the synchronization interface.
The procedure below shows how to configure HA for both the LAN and DMZ networks.
The synchronization interface is the DMZ network, the LAN virtual IP address is
192.168.100.3, and the DMZ virtual IP address is 192.168.101.3. Gateway A is the Active
Gateway.
To configure HA for Gateway A and Gateway B
1. Connect the LAN port of Gateways A and B to hub 1.
2. Connect the DMZ port of Gateways A and B to hub 2.
3. Connect the LAN network computers of Gateways A and B to hub 1.
4. Connect the DMZ network computers of Gateways A and B to hub 2.
5. Do the following on Gateway A:
a. Set the gateway's internal IP addresses and network range to the values
specified in the table above.
See Changing IP Addresses on page
162.
b. Click Setup in the main menu, and click the High Availability tab.
The High Availability page appears.
c. Select the Gateway High Availability check box.
The Gateway High Availability area is enabled. The LAN and DMZ networks are
listed.
d. Next to LAN, select the HA check box.
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