Not sure how to do it in NAM, 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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