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Old 08-23-2010, 03:41 AM   #1
thomas2004ch
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How to check if a port is allowed in iptables?


I want to check if a port is allowed in iptables. How to do this?
 
Old 08-23-2010, 04:00 AM   #2
chrism01
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iptables -L

as root user
 
Old 08-23-2010, 04:18 AM   #3
thomas2004ch
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Quote:
Originally Posted by chrism01 View Post
iptables -L

as root user
I got followings:

Code:
[root@s003ap25-test ~]# iptables -L
Chain INPUT (policy ACCEPT)
target     prot opt source               destination

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination
Assumed I will check the port 8999 is allowed in the iptables, how can I do this?
 
Old 08-23-2010, 04:28 AM   #4
blue_print
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You do not have any rules configured in Iptables. It is showing empty table. To check the opened ports in iptables, you may use the following command,

iptables -nL | grep <port number>
 
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Old 08-23-2010, 04:38 AM   #5
thomas2004ch
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I type

iptables -nL | grep 8999

But I get nothing shown. What does this mean?

Then I try and iptables -nL. But still nothing shown.

Last edited by thomas2004ch; 08-23-2010 at 04:42 AM.
 
Old 08-23-2010, 04:41 AM   #6
blue_print
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As I said already, the iptables in your system doesn't have any rules configured. For this reason, you are not getting anything after executing "iptables -nL | grep 8999".

You may refer the link http://www.linuxhomenetworking.com/w...Using_iptables

to configure iptables rules in your system.
 
  


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