[Linux] Unblock IP Address using iptables

[NetReaper]

Hello everyone,

I am new to the board and also new to Linux. I am from South Africa, working for 3 years as a Programmer (now I am a Senior Programmer).

We run a dedicated internet linux server at work and I was wondering if someone can help me. I read QT_ post on block IP addresses and it was very usefully but now I want to unblock an IP but I am NOT SURE how....erm ....help please

[NetReaper]

I figured it out,

iptables -D INPUT -s 25.55.55.55 -j DROP

But I have another problem, I rebooted this morning and I lost all the IP addresses that I have block, can someone help me please???

[aster.dongeorge]

Hope you can make use of the firewalls than this iptables. Better to make use of csf fire wall.

Here are the things to install a csf firewall and to block a particular IP

1) Log into your server and switch to the root user
2) Switch directories to your download directory
3) Download the latest version of the software: # wget http://www.configserver.com/free/csf.tgz
4) Untar the package: # tar -xzf csf.tgz
5) Switch into the new extracted folder: # cd csf
6) Run the installer: # sh install.sh
7) If you are still running APF and BFD on your server it is necessary to disable those applications: # sh disable_apf_bfd.sh

after this just use the command csf -d <ip that you want to block>
eg: csf -d 127.0.0.0

If you are running WHM you can now configure CSF and LFD from WHM. CSF/LFD comes pre-configured for a cpanel/WHM server and so there is not that much to do after the installation. Log into WHM and inspect the new configuration utility. As an example you can uninstall APF and BFD from here with the click of the button. If you want to manually edit the CSF/LFD configuration you can do so at / etc/csf/*. Make sure to make backups before you make changes as well as using the debug mode to avoid being locked out.

If for whatever reason you need to uninstall CSF and LFD you can do this easily yourself as well. Login to your server via SSH and switch to the root user.

1) Switch to the folder holding the uninstaller: # cd /etc/csf
2) Run the uninstaller: # sh uninstall.sh