Internet Backbone Index
houle at zeppo.acns.fsu.edu
Sat Jun 28 16:58:41 UTC 1997
We also have a 'ping' based local monitoring program. We monitor
response from our ISPs, national NAP's and DNS of local interest. See:
And you can get the source at:
It is table configurable to meet your local needs.
On Fri, 27 Jun 1997, David P. Maynard wrote:
> 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.)
> David P. Maynard, Flametree Corporation
> EMail: dpm at flametree.com, Tel: +1 512 670 4090, Fax: +1 512 251 8308
Art Houle e-mail: houle at zeppo.acns.fsu.edu.
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Florida State University FAX: 644-8722
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