Multicast not working in GNS3

Hi friends,


Iam studying multicast now in GNS3.I am using 3725 router with (C3725-ADVENTERPRISEK9-M), Version 12.4(15)T14.When I configured the PIM dense mode everywhere i am seeing all the interface are in forward/Dense when i sent the multicast from the server but  with out any receivers even after 2 min .Can anyone tell me which device/IOS is good for multicast study.



Arun Mohan


  • Hi Arun,

    Which module you are adding into the C3725? I think there is an issue with some network modules in GNS3. You can properly simulate the technology on C3640 IOS as well. Personally, I have done lots of multicast tasks on this platform. So, there shouldn't be any kind of issue with it.

    Hope this helps!

  • it works perfect, you need to disabe ip mroute cache and no ip route cache. this is bug in GT interfaces emulation..

  • Hi Hari,


    I changed to  using 3660 and is working fine for me.Thanks


    One more query i have.Seems this is a very basic question.


    How can I sent broadcast over the routers.Lets say PC A and PC B is seperated by three routers how can i sent the broadcast from PC A to PC B.

  • ip directed-broadcast should work for that. I don't recommend it though.

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