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Need advise. Need to capture 802.11b/g voip packets in a packet trace to examine headers for QoS settings (i.e. Diffserv).

Posted on 2008-11-04
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I need to verify that VoWIFI (802.11 b/g/a) packets have DIFFSERV bits are flipped in the TOS header. The traffic will be from a WIFI phone (Cisco; Spectralink; Abscom) and other WIFI VoIP phones, wired LAN based VoIP phones,  as well as TDM phones. If I need to buy a product ... any recommedations? Thanks
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Question by:PMcDevitt
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by:TNL_Engr
ID: 22876384
Wireshark is a great open source packet analyzer which I use for this.  I have some other tools which I use for mapping wireless coverage, and simulating VoIP calls to pre-qualify existing networks, but Wireshark is all you should need for DSCP verification.

http://www.wireshark.org 
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by:PMcDevitt
ID: 22876662
Dahhh ..... did not consider running Wireshark in promiscuous mode. Thanks.
Can you comment on how you simulate a VoIP calls?

Thanks
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TNL_Engr earned 1500 total points
ID: 22877734
For VoIP traffic analysis I use NetIQ.  This is a fairly expensive product, but absolutely the best I've ever used.
http://www.netiq.com/products/va/default.asp

SolarWinds also has a VoIP Monitor:  
http://www.solarwinds.com/products/orion/voip/voip_quality_measurement.aspx
I haven't used it, but I've heard good things about it, and I use some of their other products regularly.

PingPlotter has a pretty good program for generating tagged traffic, but there's no real analysis capability:
http://www.pingplotter.com/
I use the PingPlotter Pro tool a lot for quick testing.

For wireless coverage analysis I use Ekahau.  Great product, but also fairly expensive.
http://www.ekahau.com/

Hope this helps you.
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