Wireshark · Wireshark-users: Re: [Wireshark-users] Destination capture filtering not working

[Cliff Fogle <cliff@xxxxxxxxxxxx>]

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Thanks!  It was the vlan bit.  I was assuming the forwarding switch
would send the mirrored packets stripped of any tags.

Guy Harris wrote:
> Cliff Fogle wrote:
>
>> This also applies to tcpdump.
>
> Not surprising, as this is probably a libpcap issue, and both
> tcpdump and Wireshark/TShark use libpcap to do capturing.
>
>> If I do an unfiltered capture and use a display filter I see
>> these packets,
>
> If you look at those packets, is there an 802.1Q VLAN header
> between the Ethernet header and the IP header?
>
> If so, you need to prefix the filters with "vlan and", e.g. "vlan
> and dst port 80". _______________________________________________
> Wireshark-users mailing list Wireshark-users@xxxxxxxxxxxxx
> http://www.wireshark.org/mailman/listinfo/wireshark-users

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