UniFi Video is a legacy product line.

This application and its related devices will no longer receive any manner of technical support, including functional and security updates. Additionally, there will be no further updates to Help Center content pertaining to UniFi Video.

UniFi Network - L3 Routing with Third-Party Gateways

This article describes how to use L3 (Inter-VLAN) Routing on a UniFi Switch alongside a third-party gateway. All device-specific assistance should be directed to the third-party manufacturer.

Requirements & Notes

  • For the best experience, we recommend to use a UniFi Gateway instead of a third-party gateway.
  • When using a third-party router, it needs to support VLAN tagging and manual configuration of static routes.
  • If either of the above features are not supported on the third-party router, then it cannot be used with L3 UniFi switches.

Using a Third-Party Gateway Router

Once the network with a UniFi switch set as the Router is created, an additional network is created automatically with the Inter-VLAN routing name. This network is used to route the traffic between the (UniFi or third-party) gateway and the L3 UniFi switch.

  • The Inter-VLAN routing network is assigned the 10.255.253.0/24 IP range and uses VLAN4040.
  • The first L3 UniFi switch set as a Router will use the 10.255.253.2 IP address.
  • Additional L3 UniFi switches will use the 10.255.253.3 IP address and so on.
  • The L3 UniFi switch uses 10.255.253.1 as the default gateway to the internet (default route).

Note: It is not possible to modify the UniFi switch network range (10.255.253.0/24) or use a different VLAN than 4040. The third-party router needs to match the UniFi configuration.


The following needs to be added to the third-party gateway router to match the UniFi configuration:

  • Configure a VLAN Virtual Interface (VIF) on the third-party router and tag VLAN4040 on an interface that connects to the UniFi switch. This will be the uplink port of the switch.
  • Ensure that the UniFi switch tags VLAN4040 on the uplink port to the third-party gateway using either the All switch port profile or a custom profile.
  • Assign the 10.255.253.1/24 IP address to the interface of the third-party router.
  • Create a static route on the third-party router that matches the Subnet of the network configured in UniFi (for example 192.168.2.0/24) and set 10.255.253.2 as the next-hop. 
  • If more than one network is configured in UniFi, add additional static routes.

Note: If additional L3 UniFi switches are used, the next-hop needs to be modified, for example 10.255.253.3.

Was this article helpful?
176 out of 324 found this helpful