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Old 08-02-2001, 09:43 AM   #1
smurf
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Registered: Apr 2001
Posts: 113

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Blocking Chat programs


I am using IPChains for my Redhat 7 server.

What I intend to do is stop 1 user from accessing the following chat programs from 11:00pm to 12:00am.

1. Mirc
2. ICQ
3. MSN

I know I should be using Cron but i dont know the port numbers for any of the chat programs listed above.

Can anyone help me

Cheers
 
Old 08-02-2001, 01:04 PM   #2
dilberim82
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Run those programs on a windowz machine and then go to command line and type netstat or netstat -a(n) and it should tell you which ports it uses to connect server.
 
Old 08-04-2001, 08:11 AM   #3
smurf
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Thanks for the reply

I typed the netstat -a command in while the chat programs were on.

Active Connections

Proto Local Address Foreign Address State
TCP karl:1026 KARL:0 LISTENING
TCP karl:1032 KARL:0 LISTENING
TCP karl:1044 KARL:0 LISTENING
TCP karl:21588 KARL:0 LISTENING
TCP karl:1073 KARL:0 LISTENING
TCP karl:1025 KARL:0 LISTENING
TCP karl:1025 HOMER:nbsession ESTABLISHED
TCP karl:1026 msgr-ns15.msgr.hotmail.com:1863 ESTABLISHED
TCP karl:1032 irc.isdnet.net:6669 ESTABLISHED
TCP karl:1044 64.12.24.187:5190 ESTABLISHED
TCP karl:137 KARL:0 LISTENING
TCP karl:138 KARL:0 LISTENING
TCP karl:nbsession KARL:0 LISTENING
UDP karl:1073 *:*
UDP karl:nbname *:*
UDP karl:nbdatagram *:*

But now i need to know the ipchains command for blocking the ports and which ports to block (cant understand the output of netstat very well, Newbie) I think the ports or 1863, 6669 and 5190.

My setup is :-

Eth0 = LAN
Eth1 = Cable modem
kernal 2.2.18
Redhat 7

Its just 1 user with the IP 192.168.0.3 i want to block at certain times.

Cheers
 
  


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