[80606] in North American Network Operators' Group
Re: Acceptable DSL Speeds (ms based)
daemon@ATHENA.MIT.EDU (Florian Weimer)
Wed May 4 12:58:54 2005
From: Florian Weimer <fw@deneb.enyo.de>
To: Luke Parrish <lukep@centurytel.net>
Cc: Andrew Lee <leea@grnoc.iu.edu>, nanog@merit.edu
Date: Wed, 04 May 2005 18:58:21 +0200
In-Reply-To: <6.2.0.14.0.20050504113006.074607a0@mail.so.centurytel.net> (Luke
Parrish's message of "Wed, 04 May 2005 11:31:50 -0500")
Errors-To: owner-nanog@merit.edu
* Luke Parrish:
> Andrew, traceroute is an effective tool is measuring roundtrip in ms
> format.
No, it's not, because routers generate ICMP TTL Exceeded packets with
totally different machinery, separated from the forwarding path. Many
factors influence the ms numbers traceroute reports (MPLS, main CPU
load, priority on internal busses), and only some of them correlate
with forwarding latency.
