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
Last Modified: 2013-11-09
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
Question by:PMcDevitt
    LVL 4

    Expert Comment

    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.

    Author Comment

    Dahhh ..... did not consider running Wireshark in promiscuous mode. Thanks.
    Can you comment on how you simulate a VoIP calls?

    LVL 4

    Accepted Solution

    For VoIP traffic analysis I use NetIQ.  This is a fairly expensive product, but absolutely the best I've ever used.

    SolarWinds also has a VoIP Monitor:
    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:
    I use the PingPlotter Pro tool a lot for quick testing.

    For wireless coverage analysis I use Ekahau.  Great product, but also fairly expensive.

    Hope this helps you.

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