Linux - SecurityThis forum is for all security related questions.
Questions, tips, system compromises, firewalls, etc. are all included here.
Welcome to LinuxQuestions.org, a friendly and active Linux Community.
You are currently viewing LQ as a guest. By joining our community you will have the ability to post topics, receive our newsletter, use the advanced search, subscribe to threads and access many other special features. Registration is quick, simple and absolutely free. Join our community today!
Note that registered members see fewer ads, and ContentLink is completely disabled once you log in.
If you have any problems with the registration process or your account login, please contact us. If you need to reset your password, click here.
Having a problem logging in? Please visit this page to clear all LQ-related cookies.
Introduction to Linux - A Hands on Guide
This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter.
For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. This book contains many real life examples derived from the author's experience as a Linux system and network administrator, trainer and consultant. They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own.
Click Here to receive this Complete Guide absolutely free.
If you wanted to block the entire 126.96.36.199-188.8.131.52 range, then use either:
sbin/iptables -I INPUT -s 184.108.40.206/255.0.0.0 -j DROP
sbin/iptables -I INPUT -s 220.127.116.11/8 -j DROP
They do the same thing, you're just using CIDR notation instead of netmasks...
Note that using /24 will just block 18.104.22.168-22.214.171.124
if you do not want to do this manually, you can edit your /etc/sysconfig/iptables file.
You should never directly edit that file. It's very sensitive to syntax, including things that you can't see (like CRLF characters) which can be very difficult to diagnose. Use iptables-save (or "service iptables save" on RH-ish systems) instead.
My mistake, I meant to put in the /8 bit mask, not the /24 bit mask. I posted my response without re-reading it first.
And Capt Cavemean is right, you really shouldn't edit the /etc/sysconfig/iptables file, unless you really know what you are doing. I just mess around with it for fun... If you do decide to tinker, then make sure you make a backup of the file... Or any other system file you decide to mess with. Always good practice....