[dns-operations] subzone delegation best practice
gtaylor at tnetconsulting.net
Tue Sep 25 20:19:19 UTC 2018
On 09/25/2018 12:19 PM, Sue Steffen wrote:
> I would like to get the opinions of this list concerning subzone
> delegations to 3rd parties.
Aside: I think you mean sub-domains and / or separate domains. Zones
are closely related, but distinct. Namely, there is no such thing as a
sub-zone. Sub-domain(s) can be part of the parent zone, or in their own
> We also have a multitude of 3rd party vendors providing various niche
> services. These vendors want to have subzones delegated to them so
> they can manage their own email-related records an such. Most of them
> we have setup with their own domains to use on our behalf ( like
> xyz-them.com <http://xyz-them.com>, xyz-those.com
> <http://xyz-those.com>, etc). We constantly get requests to use a
> subzone off of our main zone for these vendors (like them.xyz.com
> <http://them.xyz.com>, those.xyz.com <http://those.xyz.com>).
> Is it preferable to have 3rd parties use an entirely separate zone, thus
> protecting the reputation of our primary zone? I worry about a mistake
> by a vendor causing our main zone to be blacklisted.
> Or is it preferable to use subzones off of the main zone, thus giving
> the public comfort that they are clicking a link or receiving an email
> from a valid xyz.com <http://xyz.com> site?
My personal preference is to use a sub-domain of the main domain. This
implies that there is a technical (thus likely also business)
relationship between a parent domain and it's child sub-domain(s).
Anybody can go out and register secure-google.com. But there is no
implied relationship with the real google.com. There /is/ implied
relationship between secure.google.com and google.com.
> How does your firm handle 3rd party delegations?
I personally prefer delegating sub-domains as necessary.
> Thanks for your thoughts,
Grant. . . .
unix || die
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