Wireshark-users: Re: [Wireshark-users] Newbie Questions for a Specific Problem
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From: Stephen Fisher <steve@xxxxxxxxxxxxxxxxxx>
Date: Fri, 28 Jan 2011 11:18:35 -0700
On Fri, Jan 28, 2011 at 11:06:41AM -0700, Mark Phillips wrote:

> 3. I fired up wireshark on my work network and starting capturing 
> packets on eth0. I looked at the DHCP routing table in the router and 
> found the phone was assigned 192.168.25.203. I set a filter for that 
> address (ip == 192.168.25.203 or eth.addr == f8:db:7f:42:db:75), hit a 
> web page on the phone and no packets were captured, even though the 
> phone says it was connected to the wireless network. The page loaded 
> on the phone. Tried sending/receiving an email. I also tried hitting 
> the "enable wifi calling" button, and no packets. What am I doing 
> wrong?

Start by reading this page and some of the pages it links to:

  http://wiki.wireshark.org/CaptureSetup