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New Member

Duplication of Packets

In wireshark i can see lots of duplicate udp packets flowing in between ip-phone and h323 gateway. What could be the reason?

5 REPLIES
New Member

Re: Duplication of Packets

Are you using SPAN to capture them? If you have SPAN configured on several ports on your LAN switch, and the packets traverse more than one port (eg, in one port, out another) SPAN may be copying the packet on ingress and also on egress.

c

New Member

Re: Duplication of Packets

Thanks for the reply.

Yes we are using RSPAN to capture IP-Phone and Voice gateway traffic for voice recording. Is there any solution to avoid this thing?

Thanks & Regards,

Santosh

New Member

Re: Duplication of Packets

All IP-Phones and Voice Gateway are in same voice vlan and we are spanning that vlan.

New Member

Re: Duplication of Packets

Either reconfigure your LAN switch (eg, capture on only one port), or modify your application to deal with the duplicates. If you want a solution that works in a variety of environments, you really need to deal with the duplicates.

c

New Member

Re: Duplication of Packets

Thank you very much

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