Using IPTables rules we can block a Single IP address or a block of IP Addresses. The following command (via ssh) will drop any packet coming from the IP address 1.2.3.4 : # iptables -I INPUT -s 1.2.3.4 -j DROP or you can use append # iptables -A INPUT -s 1.2.3.4 -j DROP How To Block Subnet…
Continue readingTag: linux
ConfigServer installation IPtables problem in OpenVZ or Virtuozzo (solved!)
ConfigServer Firewall (AKA csf) is an essential security tool for Linux based server and VPS. The installation of CSF is pretty straight forward and is described here: http://configserver.com/free/csf/install.txt However, some of the iptables modules required by the csf might not be present in the server and when the perl test command ( # perl /usr/local/csf/bin/csftest.pl…
Continue readingHow to disable IPtables Firewall in Linux (Red hat/CentOS/Fedora Core)
Disable / Turn off Linux Firewall (Red hat/CentOS/Fedora Core) Type the following two commands to save the IPtables first and then to stop it (you must login as the root user): # /etc/init.d/iptables save # /etc/init.d/iptables stop Turn off firewall on boot # chkconfig iptables off Enable / Turn on Linux Firewall (Red hat/CentOS/Fedora Core)…
Continue readingSSH commands to check Hard Drive usage information in Linux Server
Login to your Linux server using SSH Client (ie, PuTTy) Once you are connected to your server: Use to following command to check Hard Drive and partitions: (without the "#") # df -h It will show you output like this: Filesystem Size Used Avail Use% Mounted on /dev/simfs 489G 42G 447G 9% / none 7.8G…
Continue reading