Wireshark · Wireshark-users: Re: [Wireshark-users] Duplicate Packets when importing .pcap from Cisco NAM module.

[Kevin Cullimore <kcullimo@xxxxxxxxxx>]

On 8/10/2010 11:14 AM, Sake Blok wrote:
> Not sure how to do it in NAM,
It may well vary by product line (given the vendor in question, how 
could it not?), but my current understanding is that NAM requires the 
configuration of data sources, which generally are a subset of available 
mechanisms on the platforms hosting the ports to be captured from, such 
as SPAN or NDE. I went with the example I knew best.
> but the principe is to only capture "incoming" (RX) packets  instead of "both" incoming and outgoing. You need to do this, since every packet enters *and* leaves the VLAN, thus is captured twice if you capture both. This should be configured at the source side of the SPAN definition...
>
> Cheers,
>
>
> Sake
>
>
>
> On 10 aug 2010, at 16:19, Fraasch, James M. wrote:
>
>    
> > How do you do that?
> >
> > James Fraasch
> > Network Engineer
> >
> >
> > From: wireshark-users-bounces@xxxxxxxxxxxxx [mailto:wireshark-users-bounces@xxxxxxxxxxxxx] On Behalf Of Kevin Cullimore
> > Sent: Monday, August 09, 2010 5:45 PM
> > To: wireshark-users@xxxxxxxxxxxxx
> > Subject: Re: [Wireshark-users] Duplicate Packets when importing .pcap from Cisco NAM module.
> >
> > On 8/9/2010 1:01 PM, Akhtar Rasool wrote:
> >      
> > > Hello everyone,
> > >
> > > I am seeing duplicate packets when importing packet captures from Cisco NAM module into Wireshark. Would appreciate any ideas to avoid that. Thanks.
> > >        
> > If you're relying upon SPAN to monitor VLANs, you may want to ensure that you're doing so unidirectionally.
> >      
> > > Regards,
> > >
> > > Akhtar
> > >
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