C Port Assignments       

Table C-1 lists common port numbers-well-known ports-assigned to TCP and UDP services-well-known services-by IANA. A more complete list is available in RFC 1700, "Assigned Numbers."

ChoiceNet always uses the port numbers for comparison. Filters stored on the server cannot use the service name. On most hosts, you can find the port numbers in the /etc/services file.

If you are not using a filter that is dynamically downloaded from the ChoiceNet server, the filters are stored on the PortMaster. If you create the filter using PMconsole, you can specify a service name for comparison only if you have configured the Internet services and aliases database-the /etc/services file-on the host correctly. PMconsole uses NIS to look up the specified name and converts it to the assigned port number.

If you are configuring a filter on a PortMaster from the command line interface, you must use the port number. The PortMaster does not have the /etc/services file and cannot use NIS to get the equivalent information.