nanog mailing list archives
Re: Internet Backbone Index
From: "David P. Maynard" <dpm () flametree com>
Date: Fri, 27 Jun 1997 23:54:22 -0500
Here is one alternative metric. I have a monitor program that measures single-packet ping times to name servers that are registered as in-addr.arpa authorities. I figure that people should put their name servers in a "good" position on their network and that they should always be up and running. My goal is to monitor O(1000) hosts at regular intervals (currently 10 minutes), but the list currently hast just over 400 sites. I started with the web access logs for a very large site with a worldwide user base, looked up the registered in-addr.arpa servers, then hand-pruned the list to weed out sites that block ICMP, etc. ICMP echo obviously isn't the best metric in the world, but it has low overhead and allows me to monitor a large number of sites without being disruptive. (Most people shouldn't mind a single ICMP echo packet every 10 minutes.) It's been very interesting to watch the graphs as various backbones have glitches. For awhile I was comparing connectivity from a single-homed site to a 5-way multi-homed site. The difference in fault tolerance was dramatic. The next step is to combine some policy routing with some /24 network announcements that are only announced from one backbone to compare connectivity via MCI, Sprint, BBN, and UUNET. (Ie, run parallel copies of the monitor in an environment that simulates single-homed connectivity from each provider.) The results should be interesting, but I wouldn't want to claim that they represented anything more than a measure of connection quality from the particular sites where the tests were run. At the moment, the tool and the data are proprietary since I wrote it for a particular client, but I'm hoping to get permission to release the data once there are some results that are closer to "research quality." (We have been collecting data continuously since early March.) -dpm -- David P. Maynard, Flametree Corporation EMail: dpm () flametree com, Tel: +1 512 670 4090, Fax: +1 512 251 8308 --
Current thread:
- Internet Backbone Index Sean Donelan (Jun 26)
- Re: Internet Backbone Index Larry Vaden (Jun 26)
- Re: Internet Backbone Index Justin W. Newton (Jun 27)
- <Possible follow-ups>
- RE: Internet Backbone Index Chris A. Icide (Jun 26)
- Re: Internet Backbone Index Joseph T. Klein (Jun 26)
- Re: Internet Backbone Index Tim Gibson (Jun 27)
- Re: Internet Backbone Index Joe Shaw (Jun 27)
- Re: Internet Backbone Index Joseph T. Klein (Jun 26)
- RE: Internet Backbone Index Chris A. Icide (Jun 27)
- Re: Internet Backbone Index David P. Maynard (Jun 27)
- Re: Internet Backbone Index Art Houle (Jun 28)
- Re: Internet Backbone Index David P. Maynard (Jun 27)
- Re: Internet Backbone Index Stan Barber (Jun 27)
- Re: Internet Backbone Index Jack Rickard (Jun 27)
- Re: Internet Backbone Index Justin W. Newton (Jun 27)
- Re: Internet Backbone Index Stan Barber (Jun 27)
- Re: Internet Backbone Index Sean Donelan (Jun 27)
- Re: Internet Backbone Index Tim Flavin (Jun 27)
- Re: Internet Backbone Index Scott Huddle (Jun 28)
- Re: Internet Backbone Index Jack Rickard (Jun 27)
- Re: Internet Backbone Index Ben Black (Jun 27)
(Thread continues...)
- Re: Internet Backbone Index Larry Vaden (Jun 26)