Exact syntax and examples for iptables

Ahmed Sharif ahmed.sharif.bd at gmail.com
Fri Sep 18 08:59:38 UTC 2009


To start IPtables use:
#service iptables start

To stop iptables use:
#service iptables stop

Now after inserting the rules if you want to revert back, you need to delete
the rules using -D option of iptables command.

For example the following command will delete rule number 1 from INPUT
chain.

#iptables -D INPUT 1


Regards,

Ahmed Sharif

On Fri, Sep 18, 2009 at 10:44 AM, Aaron Bliss <abliss at brockport.edu> wrote:

> You will want to consult this doc, how to setup Iptables on a RedHat box.
> Rules are written to /etc/sysconfig/iptables.
>
> http://kbase.redhat.com/faq/docs/DOC-9017
>
> Aaron
>
> -----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 11:27 PM
> To: General Red Hat Linux discussion list
> Subject: Re: Exact syntax and examples for iptables
>
> Hi Aaron,
>
> iptables is not running as the previous sysadmin hardened the server.
>
> How do I turn it on?
>
>
> So I issue the two commands you gave on both cluster nodes & it will
> stop the Windows server from accessing on both nodes as well as the
> cluster virtual IP address?
>
> What's the command to reverse back, in case there's problem, I'll
> need to fallback
>
>
> Thanks
> U
> On Fri, Sep 18, 2009 at 10:35 AM, Aaron Bliss <abliss at brockport.edu>
> wrote:
>
> > 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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