ipfw question

William A. Mahaffey III wam at hiwaay.net
Sat Mar 28 21:34:36 UTC 2015

On 03/28/15 14:40, Michael Powell wrote:
> William A. Mahaffey III wrote:
> [snip]
>>>> "The M1 Garand is without doubt the finest implement of war
>>>> ever devised by man."
>>>>                              -- Gen. George S. Patton Jr.
> And, oddly enough after many, many years mine still works fine.
>>> Wireshark is pretty but requires X11. It also does a better job of making
>>> the output understandable.
>>> tcpdump should be included in the base system and is text so works
>>> without a GUI. You used to be able to take a tcpdump output file and feed
>>> it to Wireshark for viewing.
> [snip]
>> Very well, I have wireshark already installed (this is a desktop box),
>> I'll poke around & see what I find. Thanks :-).
> tcpdump can save output in a file which Wireshark can import and read. Both
> have filtering capabilities, so you can use tcpdump to capture everything
> and use Wireshark to winnow out of the spew what you find interesting. Or,
> if you already know pretty much which traffic you want to see it's often
> easier and quicker (come time to view in Wireshark) to do some basic
> filtering with tcpdump's myriad command line switches first. I do this on
> interfaces of remote machines which are servers and have no X, copying the
> file to the desktop with Wireshark. This can improve signal-to-noise ratio.
> The same information is present, but Wireshark is just better presentation-
> wise and can perform some analysis that tcpdump can not.
> -Mike
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Thanks, I am running it now, saving output:

( tcpdump -v > & LIST.tcpdump.txt & )

1 question. does tcpdump print stuff before or after ipfw messes with it 
? I only see 2 lines w/ the word BROADCAST in it (& they are input from 
another box), but still see lines indicating BROADCAST stuff being 
filtered out (& logged) by ipfw ....


	William A. Mahaffey III


	"The M1 Garand is without doubt the finest implement of war
	 ever devised by man."
                            -- Gen. George S. Patton Jr.

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