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Making your edirectory servers invisible.


echo "1" > /proc/sys/net/ipv4/icmp_echo_ignore_all and to make it stick after a reboot you can add following line to /etc/sysctl.conf file:

  1. vi /etc/sysctl.conf

Append following line: net.ipv4.icmp_echo_ignore_all = 1


Use filtcfg to create a filter to not allow icmp (make a note in the autoexec.ncf that this has been done).