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| Selecting UDP ports | ||
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When you select a UDP port, select an available 16-bit integer from the range that follows:
Use available ports in the private range 49152 to 65535
To check which ports are defined as defaults for a node, examine the file /etc/services. You should also use the netstat command to list the UDP ports currently in use. For example:
# netstat -a | more
UDP: IPv4
Local Address Remote Address State
-------------------- -------------------- ----------
*.sunrpc Idle
*.* Unbound
*.32772 Idle
*.* Unbound
*.32773 Idle
*.lockd Idle
*.32777 Idle
*.32778 Idle
*.32779 Idle
*.32780 Idle
*.servicetag Idle
*.syslog Idle
*.16161 Idle
*.32789 Idle
*.177 Idle
*.32792 Idle
*.32798 Idle
*.snmpd Idle
*.32802 Idle
*.* Unbound
*.* Unbound
*.* Unbound
UDP: IPv6
Local Address Remote Address State If
------------------------- ------------------------- ---------- -----
*.servicetag Idle
*.177 Idle
Look in the UDP section of the output; the UDP ports that are listed under Local Address are already in use. If a port is listed in the /etc/services file, its associated name is displayed rather than the port number in the output.