DGA0122 Dual LAN Subnets

Dual LAN Subnets

Desired outcome: You want the router to have a main NAT's IPv4 block and allocate IPs by DHCP to your LAN, but you want an additional public subnet which you can use on specific devices on your LAN that you configure manually.

Prerequisites: The router is in the initial state as delivered, configured without a public (Internet facing) block of IPv4 addresses. It only has one public IP address, and all IP addresses on the LAN are private and rely on network address translation (NAT).

Then, the IP block can be allocated to your line and some manual configuration can be applied to the router as follows:

System Menu

Setup your Gateway button

Routed Subnet tab

Routed Subnet settings

1. Go to gateway tile / System Info (top left)
2. Click 'Configuration' and then click 'setup your gateway'
3. Click 'Advanced', then click the 'Routed Subnet' tab
4. Here set:
   1. Firewall setting
   2. disable 'In Range WAN IP'
   3. Set the the Gateway Address to be the first usable IP in your block
   4. Select the correct subnet mask
   5. Click Save
5. you should now be able to statically configure the IP address settings on your devices using the IPs available in your block.

Note:

• DHCP will use the private IPs, it's not possible to change it (although see DGA0122 DHCP Public IPs).

• Sending a config from the A&A control pages will overwite these changes.