Selecting UDP ports


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
Do not use the following ports:
- Ports from the range of well-known ports, 0 to 1023
- Ports from the range of registered ports, 1024 to 49151

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
Active Internet connections (including servers)
Proto Recv-Q Send-Q  Local Address   Foreign Address   (state)
tcp        0      0  *.32778         *.*               LISTEN
tcp        0      0  *.32781         *.*               LISTEN
udp4       0      0  *.daytime       *.*
udp4       0      0  *.time          *.*
udp4       0      0  *.sunrpc        *.*
udp        0      0  *.snmp          *.*

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.

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