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Mapping network configuration on the target for post-failover

Make sure you have a valid source and target specified, click Configure protection from the main Full-Server Failover Manager page, and then select the Failover tab.
Specify how you want to handle network configurations on the target after failover.

Apply source network configuration to the target—If you select this option, the source IP addresses will be failed over to the target. The IP addresses associated with each NIC on the source will be mapped to the NIC you specify on the target. If the source has more NICs than the target, some of the source NICs will not be mapped to the target, or the target NICs may need to be used for more than one source NIC. If there are more NICs on the target than the source, the additional NICs will still be available after failover. If you are using a LAN environment, you should select this option.
Retain target network configuration—If you select this option, the source IP addresses will not be failed over to the target. The target will retain all of its original IP addresses. If your target is on a different subnet (typical of a WAN environment), you should select this option. The following options are available if you want to update DNS.
DNS Server—The source’s primary DNS server is selected by default. If desired, you can select a different DNS server.
Source Server IP—Select the IP address from the source that you want to remap to an IP address on the target.
Target Server IP—Select an IP address on the target that will be replace the source IP address in DNS.
Username—Specify a user that has privileges to access and modify DNS records. The account must be a DNS Admin for the domain in which the DNS server resides. You can enter a user name for a different domain by entering a fully qualified user name. The fully qualified user name must be in the format domain\username or username@domain. If you enter a non-qualified name, the DNS domain will be used by default. The domain name is obtained from the DNS server name, provided that reverse lookup in DNS is enabled.
Password—Enter the password that is associated with the specified user name.

After you have entered the DNS information, click Test to validate that DNS is configured correctly and that the specified credentials are sufficient to update DNS. When the DNS configuration is complete, click OK to save your entries and return to the Configure Protection window.
Click OK to save the settings.