Managing PING through iptables
Allow/deny ping on Linux server. PING – Packet InterNet Gopher, is a computer network administration utility used to test the reachability of a host on an Internet Protocol (IP) network and to measure the total round-trip time for messages sent from the originating host to a destination computer and back.
Blocking PING on server is helpful sometimes, if the server is continue to face any type of DDoS attack by using the PING feature. By using iptables we can simply stop the PING option to and from your server. Before starting this, you must have an idea about What is iptables in Linux?
We can call it is the basics of Firewall in Linux. Iptables is a rule based firewall system and is normally pre-installed on a Unix operating system which is controlling the incoming and outgoing packets. By-default the iptables is running without any rules, we can create, add, edit rules to it. You will get more details from the abouve link. In this article I am going to explain how we can alow/block PING in and out to a server. This would be more useful as you are Linux server admin.
We can manage it by the help of ‘iptables‘. The ‘ping‘ is using ICMP to communicate. We can simply manage the ‘icmp : Internet Controlled Message Protocol’ from iptables. Continue reading