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Re: Updating SPF type99 and TXT RR's: Simultaneity is not guaranteed.

2005-08-11 07:22:40
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Florian Weimer wrote:
* Scott Kitterman:


Interesting.  One quick comment for you...

enyo.de.         3600  IN TXT  ("v=spf1 a:212.9.189.167 "
                               "a:212.9.189.169 -all")

won't give you what you want.  The 'a' mechanism takes a domain name
arguement, not a IP address.


Oops, thanks.  These bugs should be fixed.


Why not just activate the new IP, add a second A record for
mail.enyo.de and then delete the first one after you are sure that
TTLs have expired?


Yes, my example misses the point.  I need something which actually
requires a change in the published SPF record.

On the contrary, since you have an example of something which
does not require a change in the SPF record it can be converted
into a positive example of how to write a DNS lag tolerant SPF
record.

It is the ip4: mechanism that is intolerant of DNS lag, since
it saves lookups at the cost of re-encoding information.

- --
Daniel Taylor          VP Operations            Vocal Laboratories, Inc.
dtaylor(_at_)vocalabs(_dot_)com   http://www.vocalabs.com/        
(952)941-6580x203
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