* Michael D. Berger <m.d.berger@xxxxxxxx> [2005-12-17 19:53 +0100]: > On RH-E-WS-4 I need to open a UDP socket for internal use. How shall > I select the port number? Rules for selecting an UDP port: - UDP port numbers can be between 1 and 65535. - For listening on ports <1024, your daemon needs to run with UID 0 (root user). - As long as you're not listening on a broadcast IP, there must be no other program using this port (that is, neither listening or as source-port) - Run "netstat -puna" to see which UDP ports are aready in use on your machine. - Download http://www.iana.org/assignments/port-numbers and look for "Unassigned" ports, to avoid conflicts with services you might install later. - Better choose a port outside the range given in /proc/sys/net/ipv4/ip_local_port_range, because these ports might already be in use as source-ports by other programs on later boots. -- Johannes Franken Red Hat Certfied Engineer mailto:jfranken@xxxxxxxxxxx http://www.jfranken.de/ -- redhat-list mailing list unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe https://www.redhat.com/mailman/listinfo/redhat-list
