Linux HOWTO Enable Miltucast Ping (ICMP) Replies (Echo)

The 2.6 Linux kernel does not respond to multicast ICMP Echo requests by default. This is a setting in /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts

Test it:

# cat /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts

Set it to 0 for ping replies:

# echo "0" > /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts
# cat /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts

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