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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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1. From the Data Management tab, select the DNS tab -> Members tab -> Grid_member checkbox, and then click the Edit icon.

2. In the General -> BasicAdvanced tab of the Member DNS Configuration editor, do the following:
   If you are running DNS for IPv4: In the General -> BasicAdvanced tab of the Member DHCP Configuration editor, select the IPv4 checkbox for LAN2 under DNS Interfaces. 
   If you are running DNS for IPv6: In the General -> BasicAdvanced tab of the Member DHCP Configuration editor, select the IPv6 checkbox for LAN2 under DNS Interfaces. (An IPv6 address must also be provisioned for the port.) 
   You can run either or both protocols for DNS depending on your network deployment. 

   • Automatically   create  IPv4 glue   A   and   PTR   records   for   LAN2's   address: The NIOS appliance can automatically generate A (address) and PTR records for a primary name server whose host name belongs to the name space of the zone. Select this checkbox to enable the appliance to automatically generate an A and PTR record. 

   • Automatically create IPv6 glue AAAA and PTR records for LAN2's address: automatically generate AAAA and PTR records for the LAN2 IPv6 address. A glue record is the IP address of a name server held at the domain name registry. They are needed to set a domain's name server to a host name within the domain. Example: to set the name servers of ns1.corpxyz.com and ns2.corpxyz.com, provide the glue records, which are in effect the IP addresses, for ns1.corpxyz.com and ns2.corpxyz.com, within specific DNS record types.
     Without the glue records, DNS requests never resolve to the correct IP address because the domain registry does not associate the IP with the correct records.

3. In the General -> Advanced tab (click Toggle Advanced Mode if necessary), select Select one of the following from the Send queries from and the Send notify messages and zone transfer request from drop-down lists:

   • VIP: The appliance uses the IP address of the HA port as the source for queries, notifies, and zone transfer requests.

   • MGMT: The appliance uses the IP address of the MGMT port as the source for queries, notifies, and zone transfer requests.

   • LAN2: The appliance uses the IP address of the LAN2 port as the source for queries, notifies, and zone transfer requests.

   • Any: The appliance chooses which port to use as the source for queries, notifies, and zone transfer requests.
     The Send queries from drop-down list also includes loopback IP addresses that you configured. You can select a loopback address as the source for queries.

4. Save the configuration and click Restart if it appears at the top of the screen.

5. Click Restart to restart services.