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DNS anycasting - multiple DNS servers on same subnet Vs registrar/registry policies
- Subject: DNS anycasting - multiple DNS servers on same subnet Vs registrar/registry policies
- From: bortzmeyer at nic.fr (Stephane Bortzmeyer)
- Date: Tue, 29 May 2012 12:34:51 +0200
- In-reply-to: <[email protected]>
- References: <25604_1338233229_4FC3D18D_25604_1794_1_CAJ0+aXabEt=3eG-JFH1TXXWGS3JsnuAtqzQuGA78bj-6oxAgMQ@mail.gmail.com> <[email protected]> <[email protected]>
On Mon, May 28, 2012 at 06:56:29PM -0500,
Brett Frankenberger <rbf+nanog at panix.com> wrote
a message of 15 lines which said:
> How does your employer know if two nameservers (two IP addresses) are
> on the same subnet?
The current heuristic for IPv4 is "belongs in the same /28" (and /64
for IPv6). Otherwise, Mark Andrews is right, we should use a BGP feed
but it would be complicated for a command-line tool.