How to disable PING or ICMP replies from a Ubuntu Server 16.04.2 Temporarily:

A server admin or an user can disable ping or icmp replies from a server for the following reasons,

  1. Security.
  2. Avoid network congestion.
  3. Avoid network flood using ping hostname -f

Prerequisites:

  1. Ubuntu Server 16.04.2

Implementation:

Follow the below instructions in order to disable PING or ICMP replies from Ubuntu server temporarily,

From the command line type ,

echo "1" >  /proc/sys/net/ipv4/icmp_echo_ignore_all

Note: Once the server is rebooted, the settings will go away, you have to reinforce it.

In order to re-enable the Ping and ICMP replies, either reboot the server or type the below command,

echo "0" >  /proc/sys/net/ipv4/icmp_echo_ignore_all

 

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