How to tell if something is anycasted?
bmanning at vacation.karoshi.com
bmanning at vacation.karoshi.com
Wed May 17 14:45:41 UTC 2006
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
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