Re: [Add] Relaxed validation and delegated IPv6 prefixes (Was: New Version Notification for draft-schwartz-add-ddr-forwarders-00.txt)

Ben Schwartz <bemasc@google.com> Wed, 13 October 2021 15:27 UTC

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From: Ben Schwartz <bemasc@google.com>
Date: Wed, 13 Oct 2021 11:26:48 -0400
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To: "STARK, BARBARA H" <bs7652@att.com>
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Subject: Re: [Add] Relaxed validation and delegated IPv6 prefixes (Was: New Version Notification for draft-schwartz-add-ddr-forwarders-00.txt)
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On Mon, Oct 11, 2021 at 9:09 AM STARK, BARBARA H <bs7652@att.com> wrote:

>
>
> *From:* Ben Schwartz <bemasc@google.com>
>
> In DDR, the Encrypted Resolver must hold a certificate that covers the IP
> address of the Unencrypted Resolver unless the resolvers have the same IP.
> Thus, if the gateway uses a public IP address, and is actually a forwarder,
> then the upstream resolver must return a certificate that covers the
> gateway's IP address.
>
>
>
> <bhs2> Oh good! So by “covers”, do you think it would be acceptable to
> have the certificate contain the IPv6 prefixes AT&T uses to delegate
> prefixes to wireline customers? Like 2600:1700::/28 and 2602:300::/24?
>

In principle, yes.  X.509 doesn't seem to support IP ranges (or IP
wildcards) in subjectAltName, but I think someone could write a draft to
enable that.