Selective forwarding from an internal only name server
barmar at alum.mit.edu
Thu Aug 18 01:07:48 UTC 2016
In article <mailman.301.1471466524.15653.bind-users at lists.isc.org>,
"Darcy Kevin (FCA)" <kevin.darcy at fcagroup.com> wrote:
> Cloudflare has been doing this for a while, so that their customers won't be
> "limited by the DNS specifications (RFCs)" <rolls eyes>. Having done that,
> they were compelled to offer another service -- so-called "CNAME flattening"
> -- to fix the brokenness that's caused by their base offering.
> I think Akamai also offers something similar.
But these don't work by sending an actual CNAME record. The server that
implements flattening looks ip the IP of the target, and returns it as
an A record for the domain.
That's why Cloudflare's method is "RFC-compliant", but what MS is doing
with sharepoint.com is not.
> - Kevin
> -----Original Message-----
> From: bind-users [mailto:bind-users-bounces at lists.isc.org] On Behalf Of Barry
> Sent: Wednesday, August 17, 2016 4:34 PM
> To: comp-protocols-dns-bind at isc.org
> Subject: Re: Selective forwarding from an internal only name server
> In article <mailman.299.1471461214.15653.bind-users at lists.isc.org>,
> "Darcy Kevin (FCA)" <kevin.darcy at fcagroup.com> wrote:
> > Well, sharepoint.com is a CNAME to sharepoint.microsoft.com, so you
> > might need to make arrangements for that to be resolvable as well.
> That doesn't seem valid to begin with. The .COM zone has delegation NS
> records for sharepoint.com. Having a CNAME record for the same name is wrong.
> Barry Margolin
> Arlington, MA
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