Loopback IP addresses for firewalls

You can use Loopback IP addresses to assign IP addresses that do not belong to any directly connected networks to the firewall.

Loopback IP addresses are not connected to any physical interface and they do not create connectivity to any network.
  • You can add several loopback IP addresses to each Firewall.
  • Any IP address that is not already used as a Cluster Virtual IP Addresses (CVI) or Node Dedicated IP Addresses (NDI) on another interface can be used as a loopback IP address.
  • The same IP address can be used as a loopback IP address and as the IP address of a Tunnel Interface.
  • Loopback IP addresses can be used as the Identity for Authentication Requests, the Source for Authentication Requests, and the Default IP Address for Outgoing Traffic.
  • Loopback IP addresses cannot be used as Control IP addresses for communication with the Management Server or as Heartbeat Interfaces.