Re: [dns-privacy] Ben Campbell's No Objection on draft-ietf-dprive-dnsodtls-13: (with COMMENT)

"Tirumaleswar Reddy (tireddy)" <tireddy@cisco.com> Thu, 15 December 2016 02:13 UTC

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From: "Tirumaleswar Reddy (tireddy)" <tireddy@cisco.com>
To: Ben Campbell <ben@nostrum.com>, The IESG <iesg@ietf.org>
Thread-Topic: Ben Campbell's No Objection on draft-ietf-dprive-dnsodtls-13: (with COMMENT)
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Date: Thu, 15 Dec 2016 02:12:57 +0000
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Subject: Re: [dns-privacy] Ben Campbell's No Objection on draft-ietf-dprive-dnsodtls-13: (with COMMENT)
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Hi Ben,

Thanks for the review. Please see inline

> -----Original Message-----
> From: Ben Campbell [mailto:ben@nostrum.com]
> Sent: Thursday, December 15, 2016 2:56 AM
> To: The IESG <iesg@ietf.org>
> Cc: draft-ietf-dprive-dnsodtls@ietf.org; Tim Wicinski <tjw.ietf@gmail.com>;
> dprive-chairs@ietf.org; tjw.ietf@gmail.com; dns-privacy@ietf.org
> Subject: Ben Campbell's No Objection on draft-ietf-dprive-dnsodtls-13: (with
> COMMENT)
> 
> Ben Campbell has entered the following ballot position for
> draft-ietf-dprive-dnsodtls-13: No Objection
> 
> When responding, please keep the subject line intact and reply to all email
> addresses included in the To and CC lines. (Feel free to cut this introductory
> paragraph, however.)
> 
> 
> Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html
> for more information about IESG DISCUSS and COMMENT positions.
> 
> 
> The document, along with other ballot positions, can be found here:
> https://datatracker.ietf.org/doc/draft-ietf-dprive-dnsodtls/
> 
> 
> 
> ----------------------------------------------------------------------
> COMMENT:
> ----------------------------------------------------------------------
> 
> Update: Looks like the address for Dan Wing needs to be updated.

Yes, will update.

> 
> -1: Is TCP head of line blocking considered a problem between the client and
> cacheing resolver? 

Yes, DNS resolver may not be in the local/access networks, it can be a public DNS recursive server (e.g. OpenDNS, Google). There are other use-cases where packets may be lost or delivered out of order, like we recently enhanced Cisco routers to encrypt DNS requests (using DNSCrypt) from clients and re-direct to OpenDNS.

> Otherwise, between that and the potential to use TCP fast
> open, the motivation for not just using TLS seems weak (which may not be a
> problem for an experimental RFC.)
> 
> - 3.1: "DNS clients and servers MUST NOT use port 853 to transport cleartext
>    DNS messages. "
> Am I correct to assume that this requirement is really about clients and servers
> that do not implement this spec? While I see the point, how would such a
> client or server even know about the restriction ?

No, this requirement is for clients and servers that implement this spec (similar to https://tools.ietf.org/html/rfc7858#section-3.1) 

-Tiru 

>