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Re: [DNSOP] broken compressed names, was A draft about the Name:Wreck problem draft-dashevskyi-dnsrr-antipatterns

"Wellington, Brian" <bwelling@akamai.com> Thu, 15 April 2021 16:23 UTC

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From: "Wellington, Brian" <bwelling@akamai.com>
To: John R Levine <johnl@taugh.com>
CC: Christian Huitema <huitema@huitema.net>, "dnsop@ietf.org" <dnsop@ietf.org>
Thread-Topic: [DNSOP] broken compressed names, was A draft about the Name:Wreck problem draft-dashevskyi-dnsrr-antipatterns
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Date: Thu, 15 Apr 2021 16:22:50 +0000
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References: <20210414133641.A18B572E0509@ary.qy> <59df7967-2fef-371a-4d34-4c8efec74ca0@dotat.at> <628E22EC-3395-45AB-9FD8-2405A92682BA@isc.org> <49f57263-c68c-eb2a-a7b7-7b3028dacbc8@huitema.net> <2fd24a58-b0b4-cd10-816-e94d586d8c6@taugh.com>
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Subject: Re: [DNSOP] broken compressed names, was A draft about the Name:Wreck problem draft-dashevskyi-dnsrr-antipatterns
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RFC 1035 says “prior occurance”, which would mean no.

4.1.4. Message compression

In order to reduce the size of messages, the domain system utilizes a
compression scheme which eliminates the repetition of domain names in a
message.  In this scheme, an entire domain name or a list of labels at
the end of a domain name is replaced with a pointer to a prior occurance
of the same name.


Brian


> On Apr 15, 2021, at 8:39 AM, John R Levine <johnl@taugh.com> wrote:
> 
> On Thu, 15 Apr 2021, Christian Huitema wrote:
>>> Adding test vectors would help, especially broken vectors.
>> 
>> +1. That would be a pretty good way for the IETF to help clean the mess. That, and maybe a DNS site that would serve the test vectors.
> 
> In this case I think it's a reasonable idea but I echo jck's concern that test vectors can turn into de-facto standards, particularly when the tests and the text turn out not to exactly match.
> 
> On the other hand, is it valid for a DNS compression pointer to point forward in the message?  Why or why not?
> 
> Regards,
> John Levine, johnl@taugh.com, Taughannock Networks, Trumansburg NY
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