On Tue, 2 Dec 2008, Antonio Querubin wrote:
On Wed, 3 Dec 2008, Pekka Savola wrote:
FWIW, Mtr measures latency/delay and loss based on ICMP messages heard
back from the routers on path. As a result, in almost all cases, the real
hop-by-hop latency of actual end-to-end data packets is better than it can
report.
mtr has a recently added '-u' option to use UDP instead of ICMP echo
requests.
But that doesn't change the gist of my message: it's still relying on
ICMP ttl exceeded messages sent by the routers on the path to check
the delays etc. As such it suffers from basically the same
limitations as ICMP probing.
--
Pekka Savola "You each name yourselves king, yet the
Netcore Oy kingdom bleeds."
Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings