Belajar Linux - How to disable Ping response in Ubuntu

If you want to disable ping response in your ubuntu to protect your machine.You can try following commands in terminal.
First of all,open up a terminal window from Applications->Accessories menu and run this to get super user privilege:

sudo -i

Then:
Method 1:
run this command to disable ping response:

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

and you can type this to re-enable:

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

Method 2:
run this to disable ping response:

iptables  -I  INPUT  -i  ech0  -p   icmp  -s  0/0  -d  0/0   -j  DROP

and this to allow ping response:

iptables  -I  INPUT  -i  ech0  -p   icmp  -s  0/0  -d  0/0   -j  ACCEPT