Address Group

An address group is a collection of host addresses, address ranges, and other address groups. After you set up an address group, you can use it to identify multiple hosts as a single element. You can define groups in terms of the addresses they include ("Address group A consists of the IP address 1.2.3.4 and the members of address group B"), the addresses they exclude ("Address group C consists of all the hosts on the 192.4.5.0 network except 192.4.5.5 and 192.4.5.9"), or both. Address groups cannot be self-referential; that is, you cannot include address group X as a member of address group Y and then define address group Y as a member of address group X.

There are two addresses you cannot modify: localhost, which is the IP address or addresses of the actual Screen and *, which represents all IP addresses.

The value of an address group is determined first by all included addresses, which means that all the IP addresses explicitly specified and all IP addresses contained in any other address groups included in the group are added to the address group. Next, all IP addresses of all the addresses and address groups that are excluded are removed from the address group. Note that you cannot control the order in which the IP addresses are added or removed: all includes are done before all excludes.