[162414] in North American Network Operators' Group
Re: What do people use public suffix for?
daemon@ATHENA.MIT.EDU (Jay Ashworth)
Mon Apr 15 12:01:19 2013
Date: Mon, 15 Apr 2013 12:00:23 -0400 (EDT)
From: Jay Ashworth <jra@baylink.com>
To: NANOG <nanog@nanog.org>
In-Reply-To: <20130415131017.9047.qmail@joyce.lan>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
----- Original Message -----
> From: "John Levine" <johnl@iecc.com>
> The public suffix list contains points in the DNS where (roughly
> speaking) names below that point are under different management from
> each other and from that name. It's here: http://publicsuffix.org/
>
> The idea is that abc.foo.com and xyz.foo.com have the same management,
> but abc.co.uk and xyz.co.uk do not.
>
> You don't have to tell me that it's a gross crock, but it seems to
> be a useful one. What do people use it for? Here's what I know of:
>
> * Web browsers use it to manage cookies to keep a site from putting
> cookies that will affect other sites, e.g. abc.foo.co.uk can set a
> cookie for foo.co.uk but not for co.uk.
>
> * DMARC (www.dmarc.org) uses it to find a policy record in the DNS
> that describes a subtree, e.g., if you get mail that purports to be
> from eBay@reply1.ebay.com it checks the policy at ebay.com.
>
> What other current applications are there?
Seems to me that it's a crock because *it should be in the DNS*.
I should be able to retrieve the AS (administrative split) record
for .co.uk, and there should be one that says, "yup, there's an
administrative split below me; nothing under there is mine unless
you also get an exception record for a subdomain".
The people who know authoritatively that their subdomains are within
someone else's administrative span of control *are the people who own
those domains*.
No?
Cheers,
-- jra
--
Jay R. Ashworth Baylink jra@baylink.com
Designer The Things I Think RFC 2100
Ashworth & Associates http://baylink.pitas.com 2000 Land Rover DII
St Petersburg FL USA #natog +1 727 647 1274
