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Re: [dnsext] loads of TXT records for fun and profit

Doug Barton <dougb@dougbarton.us> Fri, 03 May 2013 22:30 UTC

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Date: Fri, 03 May 2013 15:30:43 -0700
From: Doug Barton <dougb@dougbarton.us>
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To: "Murray S. Kucherawy" <superuser@gmail.com>
References: <20130425013317.36729.qmail@joyce.lan> <80ADB3EE-17FD-4628-B818-801CB71BCBFE@virtualized.org> <alpine.BSF.2.00.1304242309150.38677@joyce.lan> <46778ED3-35A2-44B4-BE3C-AAC4F7B314FF@virtualized.org> <92BBD83F-676D-4B05-B927-4101DD5CAD3E@neustar.biz> <DC121025-A014-492B-AFAD-22CDE49D866E@rfc1035.com> <CAMm+Lwi4MAjX8BAk_ro9usf6AJo=1UERhGBJ1rUa-AbrX09dqg@mail.gmail.com> <E5E3F801-6490-48A8-A12F-A6561893D78A@icsi.berkeley.edu> <D00A1E79-40F2-4EFF-975C-8618C7AC750A@virtualized.org> <20130503203921.GA22566@redoubt.spodhuis.org> <EB1F5846-C500-4277-90EA-CF37923A0212@virtualized.org> <CAL0qLwbx0OVPRJGBgbjHFzZbL3nD6+mTaMH8-Z=JkONgyWx9RQ@mail.gmail.com>
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Subject: Re: [dnsext] loads of TXT records for fun and profit
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On 05/03/2013 02:57 PM, Murray S. Kucherawy wrote:
> On Fri, May 3, 2013 at 2:01 PM, David Conrad <drc@virtualized.org
> <mailto:drc@virtualized.org>> wrote:
>
>     Last sentence of RFC 4408, section 3.1.3:
>
>     "  SPF or TXT records containing multiple strings are useful in
>         constructing records that would exceed the 255-byte maximum
>     length of
>         a string within a single TXT or SPF RR record."
>
>     Sure sounds to me like 4408 anticipates multiple TXT RRs.
>
>
> No, that section is all about having a single TXT RR whose complete
> content doesn't fit in 255 characters.  It illustrates how to achieve
> this within a single RR in zone file format.

... which doesn't prevent people from splitting them across multiple 
records.

Doug

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