Multihoming enables a system to assume multiple IP addresses on the same network. A secondary IP address can be configured on the same interface that has the primary IP address, or a secondary address can be configured on a different interface. When multiple interfaces exist, the secondary address is associated with the interface that is bound to an address that is on the same network. If the secondary address is not valid on any of the networks bound to existing interfaces, the address is rejected and an error message is produced.

When multihoming is used with the proxy server, Virtual Private Network (VPN), or Network Address Translation (NAT), the secondary addresses must be configured manually as described in this section.

To configure secondary IP addresses, complete the following steps:

1. Load NIASCFG and select the following path:

   Select Configure NIAS > Protocols and Routing

2. If you have not done so previously, configure TCP/IP under Protocols and assign one IP address to an interface under Bindings.

3. Press Esc until you are prompted to save your changes, then select Yes.

4. Select the following parameter path:

   Select Manage Configuration > Edit AUTOEXEC.NCF

5. Add a secondary IP address by entering the following command at the end of the file:

   add secondary IPAddress x.x.x.x

6. To delete or display secondary IP addresses, press Alt + Esc to display the server console prompt.

   You can delete the secondary IP address by entering the following command:

   del secondary IPAddress x.x.x.x

   You can display the secondary IP addresses by entering the following command:

   display secondary IPAddress