08-01-2002
According to the man page you can use
# snoop multicast
multicast
True if the packet is a multicast packet.
Equivalent to "ether[0] & 1 = 1".
Definition:
multicast
(1) In communications networks, to transmit a message to multiple recipents at the same time. Multicast is a one-to-many transmission similar to broadcasting, except that multicasting means sending to specific groups, whereas broadcasting implies sending to everybody. When sending large volumes of data, multicast saves considerable bandwidth, because the bulk of the data is transmitted once from its source through major backbones and is multiplied, or distributed out, at switching points closer to the end users.
According to the definition, using snoop multicast didn't work for me since it also gave me broadcast messages (Solaris). Piping to egrep seemed to work.
# snoop |egrep multicast
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mrinfo(1M) mrinfo(1M)
NAME
mrinfo - Multicast Routing Configuration Information Tool
SYNOPSIS
debuglevel] retries] timeout] [ multicast-router ]
DESCRIPTION
requests the configuration information from the multicast-ourter, and prints the information to the standard out. multicast-router can be
either an IP address or a system name. sends out the ASK_NEIGHBORS igmp message to the specified multicast-router, when the router
receives the request, it sends back its configuration information. If the multicast-router is not specified, the request is sent the local
router.
The the configuration information for each interface is printed in the following format:
If there are multiple neighbor routers on one interface, they will all be reported on the output. The possible values for flag are:
Neighbors are reached via tunnel.
The tunnel uses IP source routing.
The interface is down.
The interface is administratively disabled for multicast routing.
The local router is the querier of the subnet.
Please see mrouted(1M) for and
The command line options are:
Sets the level for printing out the debug message. The default is 0,
only error and warning messages will be printed. Debug level three prints most the messages.
Sets the retry times to pull the routing daemon for information. The
default is 3.
Specifies the timeout value in seconds for waiting the reply. The default value
is 4.
EXAMPLE
The following is an example of quering the multicasting configuration from the local routing daemon.
127.0.0.1 (localhost) [version 3.3]:
15.13.106.144 -> 15.13.106.145 (hpntcbs.cup.hp.com) [10/1/querier]
193.2.1.39 -> 0.0.0.0 (all-zeros-broadcast) [1/1/disabled]
15.13.106.144 -> 15.255.176.33 (matmos.hpl.hp.com) [10/1/tunnel]
15.13.106.144 -> 15.17.20.7 (hpspddc.vid.hp.com) [10/1/tunnel/down]
Note
must be run as root.
AUTHOR
was developed by Van Jacobson.
SEE ALSO
mrouted(1M), map-mbone(1M).
mrinfo(1M)