North American Network Operators Group
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Re: Recommendation of Tools

  • From: Pekka Savola
  • Date: Wed Dec 03 06:01:12 2008
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