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

Florian Weimer <fw@deneb.enyo.de> Sat, 11 May 2013 20:36 UTC

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From: Florian Weimer <fw@deneb.enyo.de>
To: David Miller <dmiller@tiggee.com>
References: <20130504014825.42875.qmail@joyce.lan> <5184870C.5020904@tiggee.com>
Date: Sat, 11 May 2013 22:36:41 +0200
In-Reply-To: <5184870C.5020904@tiggee.com> (David Miller's message of "Fri, 03 May 2013 23:57:00 -0400")
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Subject: Re: [dnsext] loads of TXT records for fun and profit
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* David Miller:

> TXT records don't have a specified maximum length, but they cannot be
> arbitrarily long.  They have to fit into an RR.  RDLENGTH, which
> specifies the length of the RDATA field, is an unsigned 16 bit integer
> (max 65535).  See RFC 1035 sec 3.2.1.
>
> 64k is very long, but not arbitrarily long.

It's also the overall packet length limit, so an entire RRset cannot
be larger.

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