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Wireshark-users: Re: [Wireshark-users] tshark, wlan.flags consistency & format

From: Gerald Combs <gerald@xxxxxxxxxxxxx>
Date: Thu, 25 Mar 2010 10:53:11 -0700
Anthony Murabito wrote:
Hi All,

I am currently making some changes to some automation software that uses tshark's output. My development has been primarily in a linux environment and is tied to wireless lans. I have noticed that tsharks default output is different between a windows & linux machine, and essentially I am hoping to get the nice "Flags" bitmap that appears in linux, to appear in windows.

For example, currently I am using

tshark -r (filename) -z proto,colinfo,frame.len,frame.len -z proto,colinfo,wlan.bssid,wlan.bssid

here is the corresponding tshark output:

*(linux)*
34659 372.477882 OUI_05:02:a9 -> OUI_34:cb:0e IEEE 802.11 Data, SN=285, FN=0, *Flags=.p.....TC* wlan.bssid == 00:00:00:79:37:70 frame.len == 408

*(windows)*
34659 372.477882 OUI_05:02:a9 -> OUI_34:cb:0e IEEE 802.11 Data,SN=285,FN=0 wlan.bssid == 00:15:70:79:37:70 frame.len == 408

What versions of Wireshark are you running? The "Flags" string was added to the Info column in 2007, about 6 months before the 1.0 release.