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Re: How to tell if something is anycasted?
From: bmanning () vacation karoshi com
Date: Wed, 17 May 2006 14:45:41 +0000
well Peter, ONE root server operator has that practice. Others have different practices regarding anycast. --bill On Tue, May 16, 2006 at 11:59:54PM -0700, Peter Boothe wrote:
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)