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