10-29-2009
Generally you can telnet to the port to see if it's open. If you get "Connection refused" that means 1) you can't get to that port/ip or 2) there's nothing listening on that port. If you are able to connect and have to break out of the telnet session you were successful.
To telnet to a specific port use:
telnet <ip> <port>
so:
telnet 10.20.30.1 1020
telnet 10.20.30.1 21
...
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LEARN ABOUT OPENSOLARIS
cports
cports(1M) System Administration Commands cports(1M)
NAME
cports - expand host names into <host, server, port> triples
SYNOPSIS
$CLUSTER_HOME/bin/cports hostname [hostname...]
DESCRIPTION
The cports utility expands the hostname arguments into a list of <host, server, port> triples. The returned information is used to access
the serial port consoles of the named hosts by way of the terminal server returned in the triples.
If an entry for serialports has been made in the /etc/nisswitch.conf file, then the order of lookups is controlled by that entry. If there
is no such file or no such entry, then the nameservice look up order is implicitly nis files.
EXAMPLES
Example 1 Using the cports Command
If the /etc/serialports file contains the entry:
pepsi soda-tc 5002
the following command:
% cports pepsi
prints the following string:
pepsi soda-tc 5002
This information can be used by the telnet(1) command to remotely access pepsi's console:
% telnet soda-tc 5002
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWccon |
+-----------------------------+-----------------------------+
|Interface Stability |Evolving |
+-----------------------------+-----------------------------+
SEE ALSO
telnet(1), cconsole(1M), ccp(1M), chosts(1M), crlogin(1M), cssh(1M), ctelnet(1M), serialports(4), attributes(5)
Sun Cluster 3.2 8 Sep 2007 cports(1M)