Linux 7 Multicast Configuration: Difference between revisions

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displays multicast group membership information for IPv4 and IPv6. Optionally use -n to prevent DNS lookups (faster).
displays multicast group membership information for IPv4 and IPv6. Optionally use -n to prevent DNS lookups (faster).
The same information can be obtained from /proc:
<pre>
cat /proc/net/dev_mcast
cat /proc/net/igmp
cat /proc/net/igmp6
</pre>


==Ping==
==Ping==

Revision as of 16:50, 21 March 2017

Internal

Concepts

Multicast

Procedure

Multicast at Kernel Level

Make sure multicast is enabled at kernel level.

To compile multicast support into the kernel, CONFIG_IP_MULTICAST must be present in the kernel configuration file.

Multicast Support at Interface Level

Troubleshooting

Display Multicast Group Membership Information

netstat -g

displays multicast group membership information for IPv4 and IPv6. Optionally use -n to prevent DNS lookups (faster).

The same information can be obtained from /proc:

cat /proc/net/dev_mcast
cat /proc/net/igmp
cat /proc/net/igmp6

Ping

Send Multicast Traffic

See

Java Network Traffic Generator

Organizatorium

TODO http://lartc.org/howto/lartc.multicast.html


echo 1 > /proc/sys/net/ipv4/ip_forward