Block ping request from a specific IP using iptables on Ubuntu 12 04 Tested
Block ping request from a specific IP using iptables on Ubuntu 12 04 Tested My Sever OS:Ubuntu 12.04 IP: 192.168.56.100 My Client OS:Ubuntu 13.04 IP 192.168.56.101 Task Block the ping request from client to server, so that when client ping the server, client should not get any reply. Solution Add the below rule in iptable of the server iptables -A INPUT -i eth0 -p icmp --icmp-type echo-request -s 192.168.56.101 -j DROP You have to specify the icmp-type as echo-request other wise the outgoing ping from server to client also will get blocked because when you ping client from server following happens :-ICMP echo-request is send to client :-ICMP echo-reply is send back from client to server(this get dropped if no icmp-type is indicated) Save rules in iptables permanently If you give iptables-save rules will be saved for the current session but will be gone once you reboot your machine. To save them permanently Open / etc/network/interfaces file vim /etc/network/interfaces Append the below...