You could do this with a small Perl script:
tcpdump -nl icmp | perl -e '$|;while(<>){print "\a";}'
This will give you a beep on your PC speaker every time it sees an ICMP
packet.
Hope this helps.
-Stephen
On Tue, Jan 25, 2005 at 04:04:05AM -0500, Doug Lee wrote:
> Ok, this may be odd to many, but here's what I want:
>
> I like tcpdump's powerful ways of selecting and analyzing specific
> portions of packet traffic, but I want a real-time way to represent
> the results. I am blind, so graphs don't help. <grin> Usually all I
> want to know is the pattern of packet match frequency vs. time, so a
> little click for each matching packet would translate nicely into what
> I'm looking for.
>
> My normal tactic involves directing output from tcpdump to /dev/audio
> or even /dev/pcaudio:
>
> tcpdump -l -n [... rules for traffic ...] >/dev/audio
>
> is the first trick I tried. Problem: It causes me to get kernel
> errors like "runt packet" and such, presumably because it adds too
> mmuch overhead to packet processing somehow. (This is a P166; maybe
> that problem wouldn't exist on faster hardware?)
>
> My next trick was like
>
> tcpdump -s 1 -w /dev/audio [... rules for traffic ...]
>
> No errors this time, but the output of -w is buffered regardless of -l
> (which normally makes a lot of sense, of course), so it wasn't very
> real-time.
>
> I currently run FreeBSD 4.10-STABLE, but I'd be interested in any
> solutions requiring 5.x features as well, for future planning.
>
> Please Cc me if you have any ideas.
>
> Thanks much.
>
>
> --
> Doug Lee [EMAIL PROTECTED] http://www.dlee.org
> Bartimaeus Group [EMAIL PROTECTED] http://www.bartsite.com
> The very smart may feel they have nothing to learn from anyone;
> The very wise will find something to learn from everyone. (7/14/01)
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