Ethereal-users: Re: [Ethereal-users] Multiple retransmissions

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From: Jeffrey Ross <jeff@xxxxxxxxxx>
Date: Tue, 22 Nov 2005 08:54:39 -0500 (EST)
> 
> The method I used to capture packets is as follows - I have a Cisco 2970
> switch, and all but two ports are in Vlan1, and I have set up port 23 to
> be the span destination, and vlan1 to be the span source.  The app nodes
> and the db node are all in vlan1.  I then put my laptop with Ethereal
> into port 23, and started a packet capture.  I suppose this could get
> packets twice, but I don't understand how there could be a time
> difference if it's the exact same packet. 
> 

when you specify a VLAN as the source do no specify "both" for the traffic
flow, just specify either rx or tx

Jeff