Multicast on linux

Multicast on linux

# setup the routes
ip route add 224.0.0.0/4 dev eth0

# try to ping the multicast aware hosts on your lan with 2 pings
ping -c 2 224.0.0.1
# 100% packet loss

# stop ignoring broadcasts
sudo echo 0 > /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts

# try to ping the multicast aware hosts on your lan with 2 pings
ping -c 2 224.0.0.1
# 100% packet success!

# make your change permanent
echo "net.ipv4.icmp_echo_ignore_broadcasts = 0" >> /etc/sysctl.conf