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Full Discussion: opening port
Top Forums UNIX for Dummies Questions & Answers opening port Post 11648 by rwb1959 on Monday 10th of December 2001 11:19:31 AM
Old 12-10-2001
There's not really any specific "command" to "open"
a port. All that is really needed is that some service
program be "listening" on that port. What you should verify
is that no other program is listening on that port.
You can typically find this out by doing..

netstat -a | grep 1470

...if there is anything currently listening, you'll see it in the output.
Also...

grep 1470 /etc/services

... to check the service mapping file for other services mapped
to that port.

You can also make an entry in the /etc/services file which
is a "mapping" of service names to ports. Many service programs
do not need this but in general, it will allow you to place serivces
on any port you like (as long as the service program does a name
lookup prior to defaulting to some other port).
 

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straps(8)							 Tnm Tcl Extension							 straps(8)

__________________________________________________________________________________________________________________________________________________

NAME
straps - A simple SNMP trap multiplexer. SYNOPSIS
straps [ port ] _________________________________________________________________ DESCRIPTION
The straps trap daemon listens on the snmp-trap port (usually port 162/udp) for incoming SNMP trap or inform messages and forwards them to all connected clients (like scotty). The optional port argument allows to use the straps daemon to forward messages received on a non stan- dard SNMP trap port. However, port numbers below 1024 will be rejected. Clients connect to the straps daemon by opening the AF_UNIX domain stream socket /tmp/.straps-port. Thus, the default AF_UNIX domain stream socket is named /tmp/.straps-162. Received messages are forwarded using the following format: 4 byte IP address of the sender (network-byte-order). 2 byte Port number of the sender (network byte order). 4 byte Length of the trap message (host-byte-order). n bytes The trap message itself. The straps daemon must be installed setuid root because normal operating systems require root permissions to open the standard SNMP trap port 162/udp. The straps daemon rejects all port numbers below 1024 in order to protect the system security. SEE ALSO
scotty(1), tkined(1), Tnm(n) AUTHORS
Erik Schoenfelder <schoenfr@gaertner.de> Juergen Schoenwaelder <schoenw@cs.utwente.nl> Tnm straps(8)
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