nanog mailing list archives
Re: How to tell if something is anycasted?
From: Peter Boothe <peter () cs uoregon edu>
Date: Tue, 16 May 2006 23:59:54 -0700 (PDT)
On Tue, 16 May 2006, David Hubbard wrote:
So I'm looking at a company who offers anycasted DNS; how do I tell if it's really anycasted? Just hop on different route servers to see if I can find different AS paths and then do traceroutes to see if they suggest the packets are not ending in the same location?From my routers' perspective I don't see a difference,but then I don't think I should, correct?
If they conform to the convention that the DNS root servers practice, then a dig query from several locations should suffice. Choosing an anycasted DNS root at random, you can do dig @f.root-servers.net hostname.bind chaos txt And the response should include a line like hostname.bind. 0 CH TXT "pao1b.f.root-servers.org"
From other locations, it might be "sfo2c.f.root-servers.net" or somesuch.
If they don't do that, then you are stuck with more ad-hoc methods like traceroutes from many different locations, or checking out AS-PATHS in Routeviews and using your intuition. -Peter -- Peter Boothe PhD Student "Young man, you think you're very Computer Science smart, but it's turtles all the way University of Oregon down!" http://www.cs.uoregon.edu/~peter
Current thread:
- How to tell if something is anycasted? David Hubbard (May 16)
- Re: How to tell if something is anycasted? Steve Gibbard (May 16)
- Re: How to tell if something is anycasted? Edward Lewis (May 17)
- Re: How to tell if something is anycasted? Edward B. DREGER (May 16)
- Re: How to tell if something is anycasted? Peter Boothe (May 17)
- Re: How to tell if something is anycasted? bmanning (May 17)
- Re: How to tell if something is anycasted? Martin Hannigan (May 17)
- Re: How to tell if something is anycasted? Steve Gibbard (May 17)
- Re: How to tell if something is anycasted? Joe Abley (May 17)
- Re: How to tell if something is anycasted? Martin Hannigan (May 17)
- Re: How to tell if something is anycasted? Gustavo Lozano (May 17)
- Re: How to tell if something is anycasted? bmanning (May 17)
- Re: How to tell if something is anycasted? Joe Abley (May 17)
- Re: How to tell if something is anycasted? Peter Boothe (May 18)
- Re: How to tell if something is anycasted? Steve Gibbard (May 16)
- <Possible follow-ups>
- Re: How to tell if something is anycasted? Peter Boothe (May 18)