Ping is used to check if a machine is up or to find whether it can accept packet datas , Most of the hackers uses ping for finding the hackable machine. The hacking chances can be reduced by blocking ping.
in ubuntu ping can be disable by adding following line to /etc/init.d/networking (network init script)
echo 1 >/proc/sys/net/ipv4/icmp_echo_ignore_all
to re-enable
echo 0 >/proc/sys/net/ipv4/icmp_echo_ignore_all
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