D'oh...should be:
tcpdump -nl icmp |perl -e '$|=1;while(<>){print "\a";}'
-Stephen
On Tue, Jan 25, 2005 at 02:43:36PM -0500, Stephen L. Martin wrote:
> You could do this with a small Perl script:
>
> tcpdump -nl icmp | perl -e '$|;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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>
> --
> "....the number of UNIX installations has grown to 10, with more
> expected...." - Dennis Ritchie and Ken Thompson, June 1972
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--
"....the number of UNIX installations has grown to 10, with more expected...."
- Dennis Ritchie and Ken Thompson, June 1972
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