# System Aliases

System Aliases are automatically created non-editable Aliases.

The System Aliases are preceded with two $$ characters. The following table lists the definitions of all System Aliases. These Aliases are used in the Engine’s default policies.

Table 1. System Aliases
System Alias | Description
--- | ---
$$ DHCP Enabled Interface Addresses | IP addresses (of CVIs on clusters) which have DHCP relay enabled.
$$ DHCP Enabled interface addresses for Mobile VPN clients | IP addresses (of NDIs on clusters) which have DHCP relay enabled for mobile VPN clients.
$$ DHCP Interface X.dns | IP address of the DHCP-assigned DNS server for the interface with DHCP index number X.
$$ DHCP Interface X.gateways | IP address of the DHCP-assigned default router for the interface with DHCP index number X.
$$ DHCP Interface X.ip | DHCP-assigned IP address for the interface with DHCP index number X.
$$ DHCP Interface X.net | Directly connected network behind the interface with DHCP index number X.
$$ Interface ID X.ip | First IP address (CVI) of Physical Interface ID X.
$$ Interface ID X.net | Directly connected networks behind Physical Interface ID X.
$$ Local Cluster | All addresses of the cluster.
$$ Local Cluster (CVI addresses only) | All CVI addresses of the cluster.
$$ Local Cluster (DHCP Interface Addresses) | All DHCP-assigned IP addresses of the engine.
$$ Local Cluster (NDI addresses only) | All NDI addresses of all nodes in the cluster.
$$ Local Cluster (NDI for heartbeat addresses only) | Heartbeat NDI addresses of all nodes in the cluster.
$$ Local Cluster (NDI for management addresses only) | Management NDI addresses of all nodes in the cluster.
$$ Log Servers | IP addresses of all Log Servers.
$$ Management Servers | IP addresses of all Management Servers.
$$ Valid DHCP Address Pools for Mobile VPN clients | Address pools defined for assigning virtual IP addresses to mobile VPN clients.
$$ Valid DHCP Servers | All DHCP servers defined for the Engine.
$$ Valid DHCP Servers for Mobile VPN clients | The DHCP servers defined for assigning virtual IP addresses to mobile VPN clients.