[GLLUG] tcpdump

[Martin Konrad]

Hi Chick,
You can use tcpdump to save traffic into a file and analyze that data
with Wireshark later [1].

Cheers,

Martin

[1] https://www.wireshark.org/docs/wsug_html_chunked/AppToolstcpdump.html

On 08/13/2016 04:13 PM, Chick Tower wrote:
> I upgraded to the new Slackware (14.2), and it has a newer version of
> Firefox (45.3.0, after one upgrade).  I'm on dial-up, and as soon as I
> fire up Firefox the modem lights start flashing away, and my effective
> modem speed seems to be at least halved.  So, in addition to trying
> other, less "chatty" browsers, I wanted try and analyze the traffic to
> see if I could block it or modify Firefox to stop it.
> 
> Has anyone used tcpdump?  I was looking at wireshark, but it said it was
> a graphical version of tcpdump, and tcpdump is already installed.
> However, when I run it, even according to the examples, it doesn't catch
> anything at all.  I've tried the following commands, as root:
> 
> tcpdump host <myhostname>
> tcpdump -v host <myhostname>
> tcpdump -v host <myfullyqualifiedhostname>
> tcpdump -v host localhost
> 
> Does anyone have any tips?