[dns-operations] creeping poorness of judgement

John Levine johnl at taugh.com
Sat Mar 14 13:19:33 UTC 2020


In article <b82f993d-b59f-6535-87f8-3aad6b0095f0 at redbarn.org> you write:
>
>
>SM wrote on 2020-03-13 20:52:
>
>who are you? "SM" is not personal enough for my tastes.
>
>> Hi Paul,
>> ...
>> 
>> That matches https://kb.isc.org/docs/aa-00356  The RFC referenced in 
>> that article is RFC 4408 instead of RFC 7208.
>
>the concatenation of <character-strings> on 255-octet boundaries has 
>never been specified in a DNS RFC, and if the DKIM and SPF 
>specifications require this, they are legislating from the bench.

Fortunately, that's not what they say.  They say to catenate the
strings in the TXT record when they are interpreted as SPF or DKIM
instructions.  The strings are however long they are.  

Some zone management software breaks overlong strings into 255 octet
chunks but that's hardly new.  djbdns did it in the 1990s.

Spaces in SPF and DKIM records are significant so if you use master
files, you have to quote the spaces.



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