CODEWITHSUNDEEP
ipmulticast
seewalker
seewalker

Reputation: 1243

How To Determine How I'm Using IP Multicasting?

It's my understanding that IP multicasting works by receivers joining IP multicast groups with IGMP messages, senders sending to those addresses, and routers addressed in that way duplicating the message and sending to all receivers in the group.

I've never elected to join a multicast group. What software that I might use would likely join a group on my behalf? Do commonly-used programs often send to multicast addresses on my behalf? What tools, especially command-line tools, expose this information? Something similar to what ipcs provides for shared memory, what ps provides for processes, etc. I'm especially interested in linux or OSX environments.

Upvotes: 0

Views: 71

Answers (1)

user207421
user207421

Reputation: 310885

Use

netstat -g

NB there is no duplication. If a router has members inside, it propagates the datagram, once, on the inside LAN.

Upvotes: 1

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