Note: You can configure multiple interfaces on the Infoblox-4030 appliance only. For information, see Advertising Loopback Addresses to the Network. When you configure non-anycast addresses on the loopback interface, ensure that you establish a static route between the appliance and the router so queries to these addresses are routed correctly. For information, see Specifying Source Ports. You then configure the appliance to listen for DNS queries solely on this address. You first add an IP address you want to use for DNS queries on the loopback interface. You can also add an IP address that is used solely for DNS queries, to separate the DNS traffic. After the server migration, you can shut down the old servers and use the new one for services.ДЇigure 24.1 DNS Server Migration Using the Loopback Interface You can add all three IP addresses to the loopback interface of a NIOS appliance, and then configure the appliance to provide DNS services on all addresses. The migration takes a few weeks and you want DNS services to be available on all three addresses during the migration. As illustrated in Figure 24.1, you have two existing DNS servers ( 192.204.18.11 and 192.204.18.12) and you want to replace these servers with a new one ( 192.204.18.88). You can configure IP addresses on the loopback interface to minimize service downtime during a server migration. For information, see Configuring IP Addresses on the Loopback Interface.

Add an IP address of the source port for DNS queries.

To separate DNS queries from DNS transfers and notify messages, complete the following: For information, see Specifying Port Settings for DNS and its subtopic, Specifying Source Ports. This is the primary application for routing protocols in the NIOS appliance.

For information, see Configuring OSPF on the NIOS Appliance and Configuring BGP in the NIOS Appliance.

Configure anycast addressing protocols.

For information, see Configuring Anycast Addresses.

Add anycast addresses to the loopback interface.

To configure DNS anycast addresses and their advertising protocols, complete the following:

Enable DNS services on the loopback addresses.

Add IP addresses to the loopback interface.

To configure non-anycast addresses on the loopback interface, complete the following:

When you use the loopback interface for anycast addressing, the upstream and neighboring routers can continue to advertise anycast addresses without being affected by hardware malfunctions.

Separate DNS traffic by assigning an IP address as the source port for DNS queries.

For information, see About Anycast Addressing for DNS.

Add anycast addresses to improve the reliability and performance of DNS services in multiple locations.

Configure IP addresses to consolidate DNS servers for migration purposes.

You can do the following on the loopback interface:

The loopback interface is a virtual network interface on the appliance.

Ipv4 loopback address