Route traffic to downstream Subnets

You can choose to split your internal network into subnetworks (Subnets) for increased security and easier network management. You must have a Subnet Rule for any network not physically attached to the Smoothwall Appliance to allow routing to that network.

Add a Subnet rule

1. Go to Network > Routing > Subnets and go to the Add a new rule section.
2. Enter the Network IP address to specify the network ID part of the subnet.
3. Enter a Netmask to specify the size of the subnet.
4. Enter the Gateway IP address of the subnet on a network directly connected to the Smoothwall Appliance.
5. Leave the router Metric as 0, or enter a new value to set the order in which ip route applies the Subnet rules when they are available.

     Important

   Smoothwall Appliance sends commands to ip route, which selects a Subnet rule. Lower Metric values take precedence over higher values. When two Subnet rules have the same Metric, ip route chooses a Subnet rule to apply. Ensure all Subnet rules have a unique Metric value to prevent network issues.

6. (Optional) Enter a descriptive Comment.
7. Ensure the Enabled checkbox is selected.
8. Select Add.

Edit a Subnet rule

1. Go to Network > Routing > Subnets.
2. In the Current rules table, select the checkbox in the Mark column.
3. Select Edit. The selected rule appears in the Add a new rule section.
4. Edit the fields as needed.
5. (Optional) Clear the Enabled checkbox to keep the rule in the list while having Smoothwall Appliance ignore it.
6. Select Add.

Delete a Subnet rule

1. Go to Network > Routing > Subnets.
2. In the Current rules table, select the checkbox in the Mark column.
3. Select Remove.