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SonicOS 5.8.1 Administrator Guide
Adding a Secondary Subnet using the Static ARP Method
Step 1 Add a 'published' static ARP entry for the gateway address that will be used for the secondary
subnet, assigning it the MAC address of the SonicWALL interface to which it will be connected.
Step 2 Add a static route for that subnet, so that the SonicWALL regards it as valid traffic, and knows
to which interface to route that subnet's traffic.
Step 3 Add Access Rules to allow traffic destined for that subnet to traverse the correct network
interface.
Step 4 Optional: Add a static route on upstream device(s) so that they know which gateway IP to use
to reach the secondary subnet.
Consider the following network example:
To support the above configuration, first create a published static ARP entry for 192.168.50.1,
the address which will serve as the gateway for the secondary subnet, and associate it with the
appropriate LAN interface. From the Network > ARP page, select the Add button in the Static
ARP Entries section, and add the following entry:
Internet
Network Security Appliance
NSA
LAN IP
MAC
DMZ/CTP IP
MAC
WAN IP
192.168.168.168
00:06:81:04:00:E4
192.168.50.1
00:06:01:04:00:E5
66.178.222.123 (ISP assgined)
192.168.168.5
192.168.50.5 192.168.50.10
192.168.50.1
192.168.168.7
Simplified NSA ARP Table
192.168.168.x/24
LAN
192.168.50.x/24
DMZ
WAN