Re: base32 alphabet rant - rhaaaaa rfc3548

[David Blacka <davidb@verisignlabs.com>]

On Oct 24, 2005, at 1:14 PM, Paul Vixie wrote:


> # What happens when pre-EDNS0 DNS software sees an extended label  
> type?
>
> it won't, since it will not do the EDNS negotiation, and this  
> element will
> not be usable in messages to such agents.
>
> # What happens when post-ENDS0 softwares sees an unknown extended  
> label type?
>
> again, it won't.  this would be a new element whose structure is  
> not known
> by EDNS0 agents, and so it would require a version number  
> increment.  (unlike
> flags, whose structure is known but whose meaning is not... with a  
> flag, you
> only have to increment the version number if "ignored by older  
> agents" is not
> acceptable to the flag-designer.)

I see.  Adding an extended label type implies increasing the EDNS  
version.  This wasn't clear to me.  It doesn't seem to be stated one  
way or another in RFC 2671.

--
David Blacka    <davidb@verisignlabs.com>
Sr. Engineer    VeriSign Applied Research




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