On Wed, Jan 02, 2008 at 04:01:18PM +0100, Rogier Wolff wrote:
> How traceroute decides that it reaches the destination I don't
> remember. Traceroute however takes ages: It sends out one packet,
> waits for the result or times out, and then tries the next hop.
> (after trying the same hop 3 times).
Dunno about all versions of traceroute, but at least a couple of them send
out packets to the first hop to a high UDP port number, then the next hop to
that port number + 1, then the third hop to port number + 2, etc.
ICMP doesn't have port numbers, but you can tuck freeform data into the
echo request packet, which in theory makes it back in the reply. For most
routers. I think.
--
Robert Woodcock - [EMAIL PROTECTED]
"We would like to return to work with our writers. If we cannot, we would
like to express our ambivalence, but without our writers we are unable to
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