UNIX for Dummies Questions & Answers

hi, given this 111.22.31.123:1554, isnt this 1554 defined in /etc/services? i am on aix. and this 1554 is a port?

thanks

Are you talking about a 'client port' or a 'server port' ? Client ports are not mapped in /etc/services. Generally, (not multicast) TCP/IP connections have two endpoints, the listening socket and the client socket.

It would be helpful to post the results of the command:

Code:

netstat -an | grep 111.22.31.123:1554

or simply:

Code:

netstat -an | grep 1554

netstat -an | grep 1554 gives me the below

tcp4 0 0 *.1580 *.* LISTEN



and from your reply, i gather the following:

1) server ports are mapped in /etc/services?

2) where is the client port defined?

3) from the output, this 1580 port is a listening port then?

thanks!

Well, first please help me understand the puzzle in your reply:

that is simply is not possible

it is always possible to run things like irc deamon on such ports ;-) or that someone is running something ont hat withouth asking (above 1K users can run services ;-) ).

It is 'not possible' because you can't grep for a number in a line and get a line without the number (as you have written the command). (not a networking puzzle, a grep issue)

That is the puzzle......... the output of the grep command is not possible.

NEO, my understanding to your reply is that my command as below

netstat -an | grep 1554

contains the number 1554 BUT

the output as belows has no 1554 but 1580

tcp4 0 0 *.1580 *.* LISTEN

and according to u, there is NO WAY for this to happen....., right?


Okay, i have made an typo error, the command and output should be as below

netstat -an | grep 1580 gives me the below

tcp4 0 0 *.1580 *.* LISTEN

is this okay?

back to my three little questions.. Thanks pal!