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The LAN2 port is a 10/100/1000Base-T Ethernet connector on the front panel of the TE-815, TE-825, TE-1415, TE-1425, TE-2215, TE-2225, TE-4015 and TE-4025 the X5 and X6 appliances. By default, the LAN2 port is disabled and the appliance uses the LAN1 port (and HA port when deployed in an HA pair). Before you can enable and configure the LAN2 port on a Grid member, you must first configure the member and join it to the Grid. You must also have read/write permission to the Grid member on which you want to enable the port. When you enable the LAN2 port and SNMP, the appliance sends traps from this port for LAN2 related events. The LAN2 port does not work on all public cloud (AWS, Azure, GCP) appliances.

You can configure the LAN2 port in different ways. You can enable the port redundancy or port failover feature, which groups the LAN1 and LAN2 ports into one logical interface. The LAN1/LAN2 grouping can be activated for both IPv4 and IPv6. Alternatively, you can configure the LAN2 port on a different IP network than LAN1, and enable the LAN2 port to provide DNS and DHCP services. 

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The LAN1 or LAN1 (VLAN) and LAN2 or LAN2 (VLAN) ports share the IP address of the LAN1 or LAN1 (VLAN) port; the port that is currently active owns the IP address. When you enable services on the appliance, such as DNS and DHCP, clients send their service requests to the LAN1 or LAN1 (VLAN) port IP address and receive replies from it as well. The port supports the services and features supported on the LAN1 or LAN1 (VLAN) port as listed in Appliance Roles table and Sources and Destinations for Services table, see Configuring Ethernet Ports. You cannot enable the port redundancy feature if the LAN2 or LAN2 (VLAN) port is serving DNS or DHCP.
For example, you can use the MGMT port for Grid communications, and the LAN1 and LAN2 ports are connected to the same switch. The LAN1 and LAN2 port share the IP address of the LAN1 port, which is 1.1.1.5. In the illustration, LAN1 is the active port.

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