About host labels
Host label settings are located on the Administration > Networking: Host Labels page.
Host labels enable you to group sets of hostnames and subnets to streamline configuration. Host labels are compatible with autodiscover, pass-through, and fixed-target (not packet mode) in-path rules. Host labels aren’t compatible with IPv6.
Having a large number of hosts under a single host label might result in the error “No such host is known.” If you receive this error, reduce the number of hosts under a single label.
You can define a set of file servers in a host label, use that host label in an in-path rule, and apply a policy limiting all IP traffic to and from the servers (independent of what protocol or application is in use). Other ways to use host labels include:
• List multiple dedicated application servers by hostname in a single rule and apply a policy.
• List multiple business websites and servers to protect.
• List recreational websites to restrict.
These guidelines apply to host labels:
• Use a comma-separated list when entering multiple hostnames and subnets. You can also use spaces or line breaks to separate multiple hostnames and subnets.
• Use this format: xxx.xxx.xxx.xxx/xx where /xx is a subnet mask value between 0 and 32.
• A host label can be a fully qualified domain name (FQDN).
• A hostname can appear in multiple host labels. You can use up to 100 unique hostnames.
• A host label can contain up to 64 subnets and hostnames.
For general information about labels, see
About labels.