Wireshark-users: Re: [Wireshark-users] Looking for a portable sniffing-friendlyhub/switch
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From: Lee <ler762@xxxxxxxxx>
Date: Mon, 12 Apr 2010 17:17:55 -0400
On 4/12/10, Oldcommguy - Tim <oldcommguy@xxxxxxxxxxxxx> wrote:
> The DIY tap actually works....depending on how well one follows directions.
>
> For VoIP with a SPAN port , please remember, there will not be any jitter
> and loss frames for your analysis.

Where are you getting that from?   Work has VoIP & a span port on a
cisco cat6500 worked just fine for me - vlan tags are correct &
packets not showing up at the sniffer match up with voice drop-outs on
the phone as do packets delayed beyond [whatever the jitter buffer is
*] matching up with poor voice quality on the phone.

Regards,
Lee


* it's been a while since I've had to use a sniffer to debug voip
problems - I don't remember what the jitter buffer is now.