On Tue, 8 Feb 2000, Kenneth E. Lussier wrote:
> That's a really good question (and I wish I had an answer). I'm guessing
> that `netstat` can somehow tell you what's listening on what ports. A
$ netstat -an
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 172.16.1.1:1023 206.135.68.99:1019
ESTABLISHED
tcp 1 0 172.16.1.1:2069 208.51.139.19:80
CLOSE_WAIT
tcp 0 0 0.0.0.0:6000 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:1024 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:25 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:515 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:98 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:79 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:513 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:514 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:23 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:21 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN
udp 0 0 0.0.0.0:177 0.0.0.0:*
udp 0 0 0.0.0.0:518 0.0.0.0:*
udp 0 0 0.0.0.0:517 0.0.0.0:*
udp 0 0 0.0.0.0:111 0.0.0.0:*
raw 0 0 0.0.0.0:1 0.0.0.0:* 7
raw 0 0 0.0.0.0:6 0.0.0.0:* 7
[SNIP]
Look at the local address column... if you see 0.0.0.0:110 or
MACHINE_IP:110 with a state of LISTEN, it means something is bound to port
110. You can see that I'm running an X server (port 6000), sendmail (port
25), a web server (port 80), lpd (port 515), sshd (port 22), etc. etc. ad
nauseum.
However, the only thing that should be binding to port 110 is a pop
server, so it's unlikely that you're accidentally running something else
that has it locked up.
You can also use the -p option on RH 6.1 (and maybe other distros...) to
identify what process is associated with each open socket.
--
"Quis custodiet ipsos custodes?" "Who watches the watchmen?"
-Juvenal, Satires, VI, 347
Derek D. Martin | Senior UNIX Systems/Network Administrator
Arris Interactive | A Nortel Company
[EMAIL PROTECTED] | [EMAIL PROTECTED]
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