HP-UX IPFilter Version 15.01 Administrator's Guide

ResultAliasOperand
true if port is less than or equal to the specified valuele<=
true if port is greater than or equal to the specified valuege>=
Service Names
You can specify a service name defined in the /etc/services file instead of the port number
when specifying a single port (when using the = operand). For example, you can configure the
following rule:
block in proto tcp from any to any port = telnet
Basic Rule Syntax: Specifying the Action, Direction, Protocol, IP Addresses, and Ports 27