Linux 7 Multicast Configuration: Difference between revisions

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For more details on these files see [#.2Fproc|/proc]] above.
For more details on these files see [[#.2Fproc|/proc]] above.


==Ping==
==Ping==

Revision as of 16:56, 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

/proc

/proc/net/dev_mcast

Contains Layer2 multicast groups which a device is listening to (interface index, label, number of references, number of bound addresses).

/proc/net/igmp

Contains IPv4 multicast groups joined by this host.

/proc/net/igmp6

Contains IPv6 multicast groups joined by this host.

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

For more details on these files see /proc above.

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