To apply the policies described above, write the following content policy language (CPL):
define condition InstantMsg
end condition InstantMsg
client.address=203.0.*.0 condition=InstantMsg deny
IP address wildcards are supported in several CPL conditions; refer to the Content Policy Language Reference for more information.
In the Visual Policy Manager (VPM), you can use IP address wildcards in some Source and Destination objects. If you add or edit an object that supports wildcards, the dialog displays a hint below the entry field.
For more information, refer to the Visual Policy Manager and Advanced Policy Tasks Reference.
You can also use IP address wildcards in RDNS restrictions and in subnet definitions. For more information, refer to "restrict rdns" and "define subnet" in the Content Policy Language Reference.
For information on specifying an IP range in policy, see How so I specify a range of IP addresses in policy?.