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Client PC send Multicast packets

By jayesh_nishane ·
I have a seperate Network with around 60 PC's for real time application. 50 nos. PC are DOS based and others are Windows 2000 PC's. 3 of my Windows 2000 PC's started sending multicast packets continously due to which my Network bandwidth utilization shooted to more than 90%.
What may be the reason for my client PC sending multicast packets continously.

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by Bobsta In reply to Client PC send Multicast ...

If it happened all of a sudden, I'm guessing you could have some serious Virus activity on your Win 2000 PC's. Check your security on those PC's.

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by Oldefar In reply to Client PC send Multicast ...

Two situations where Windows 2000 will send multicast packets are when OSPF routing is enabled on the workstation and when trying to join a multicast audio or video session.

Check the network configuration on those 3 nodes first and make sure they aren't configured to route OSPF.

Next, check to see if they are trying to join something like NetMeeting. The stations will transmit IBMP packets while searching for a meeting to join.

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by Oldefar In reply to

At you can download a trial monitor to see what the PC are sending.

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by CG IT In reply to Client PC send Multicast ...

answer # 2 sounds about right. IGMP multicast packets sounds like someone is trying netmeeting or someone sending video or sound so others and see or hear it. 3 computers all "singing out" to their hearts content on IGMP multicast certainly would chew up bandwidth.

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