Port

This specifies the range of port numbers for the TCP or UDP protocols. For example, UDP port 500 corresponds to the IKE used by IPsec.

If this value is not equal to 0, then the rule only applies when an IPv4 TCP or UDP packet arrives or when the source of the target TCP/UDP port is within the range defined by these two values.

If a zero (0) is entered as the end port, the rule applies only for the start port. The port numbers of the receiving port and the target port are compared, and a rule applies if just one of these is within the defined range. If the protocol and the sub-protocol are set, but the port fields have the value 0, then the rule applies to all packets of the specified sub-protocol (e.g. for all packets for protocol 0800/6).