SonicWALL TZ 190 Secondary Subnets with Static ARP

Network > ARP
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SonicOS Enhanced 4.0 Administrator Guide
address on any other interface. It will also remove any dynamically cached references to
that MAC address that might have been present, and it will prohibit additional (non-unique)
static mappings of that MAC address.
• Update IP Address Dynamically - The Update IP Address Dynamically setting in the
Add Static ARP window is a sub-feature of the Bind MAC Address option. This allows for
a MAC address to be bound to an interface when DHCP is being used to dynamically
allocate IP addressing. Enabling this option will blur the IP Address field, and will populate
the ARP Cache with the IP Address allocated by the SonicWALL's internal DHCP server,
or by the external DHCP server if IP Helper is in use.
Secondary Subnets with Static ARP
The Static ARP feature allows for secondary subnets to be added on other interfaces, and
without the addition of automatic NAT rules.
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: