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Old 05-18-2011, 12:07 AM   #1
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sysctl help needed.(Server Hardening).

As per Hardening guide for the server.

ICMP Broadcast Response: The kernel parameter icmp_echo_ignore_broadcasts must match to 1

However when i check the value of icmp_echo_ignore_broadcasts it thrown an error as unkonwn key.

# sysctl icmp_echo_ignore_broadcasts
error: "icmp_echo_ignore_broadcasts" is an unknown key
I would like to know what is recommended at this point.
Shall i add it? Is there any way of adding the key?
Just ignore it as this key doesn't exists in my distribution.
Old 05-18-2011, 12:23 AM   #2
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You're not using the full name, try running 'sysctl -a | grep icmp' and you'll see it listed as 'net.ipv4.icmp_echo_ignore_broadcasts'

Just add it to /etc/sysctl.conf if it's not there already:
net.ipv4.icmp_echo_ignore_broadcasts = 1


Last edited by kbp; 05-18-2011 at 12:24 AM.
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