@ wrote... (7 years, 5 months ago)

I was trying to get multicast working and all of the ancient howtos weren't helping.

Purely by accident I found the solution to the multicast “hello world” of pinging 224.0.0.1.

# 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
sudo echo "net.ipv4.icmp_echo_ignore_broadcasts = 0" >> /etc/sysctl.conf
Category: tech, Tags: linux, networking
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