Exact syntax and examples for iptables

[Aaron Bliss]

Assuming that you already have iptables running

/sbin/iptables -I RH-Firewall-1-INPUT -s 10.5.5.25 -j DROP
/sbin/service iptables save

-----Original Message-----
From: redhat-list-bounces at redhat.com [mailto:redhat-list-bounces at redhat.com]
On Behalf Of sunhux G
Sent: Thursday, September 17, 2009 10:30 PM
To: General Red Hat Linux discussion list
Subject: Exact syntax and examples for iptables

Hi,

I have a RHEL 5.1  cluster that's constantly being accessed by
application from a Windows server application via sqlnet (ie Tcp
port 1521) which caused a specific Oracle accounts to be locked.

Thus I would like to set up iptables / firewall on this Linux box to
stop the sqlnet access.  Can someone provide me some example
commands / syntax ?

Source IP address : 10.5.5.25   (Windows server)
Tcp port : 1521
My Linux boxes IP address :  10.5.5.46 / .47
My Linux cluster virtual addr : 10.5.5.45

In fact I would like to block on all ports on the Linux cluster to stop
this Windows server from accessing it.  So what's the exact commands
I should issue on each of the Linux box?  Would iptables also block
the Windows server from accessing the cluster virtual IP addr?


Thanks
U
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