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Re: Domain names for ISP infrastructure links
From: dlc () avtel net (David Carmean)
Date: Tue, 7 Jan 1997 14:21:32 -0800 (PST)


In one message, Paul Vixie wrote:

       [<iface>.]<router>.<pop>.<toplev>

In another message, Philip J. Nesser II wrote:

Alex.Bligh supposedly said:


<2 letter POP code> <router number> - <1 let card type> <card no>
  - <i/f number> [ - <sub i/f number> [ - <DLCI num> ]]
  [ <2 letter POP code> <router number> ]

TH1-S2-3-4-5-ME6


Well I think this is the best suggestion I have seen but I have a few
comments:

1.  I really like the addition of the final pop-router combo so its easy to
follow connections.  This has been missing in other suggestions so I am
curious as to what others think.


It doesn't tell you what interface on the upstream router it's talking 
to, so I don't see an advantage.


2.  Using an fixed width format as proposed keeps the maximum length (not
including the domain suffix) short. Assuming 2 digit router/interface
numbers and a four digit DLCI, the max length is 24 characters.  (Even if
we allow 3 digits to router numbers we max at 29).  I would propose to add
a little more information in the form of 1 letter types in from of the
numbers (like a 'd' before the DLCI number).  Looking at the example above
is marginally okay because all field are present but what if there was
either no subinterface or no DLCI, how would you tell what the last number
is supposed to mean?


Just personal preference here, but I think Paul's example is easier to 
grok, especially if you don't know the "convention" beforehand.  The 
similarity to DNS subdomain heirarchy lends itself directly to the 
router, then the slot, then the interface, and then the sub-interface/
DLCI/PVC/what-have-you.


3.  How do people feel about putting the speed of the link in the DNS name,
I have seen one yea and one nay.  I am ambivilant, but leaning towards no,
not for privacy but for administrative ease.  If I upgrade a connection I
don't want to have to remember to change my DNS entries.

4. Are people actually interested in pursuing this formally?  If a spec was
written would you change your DNS names to conform?  Would you be willing
to set up a formal registration process with the IANA for 2(or 3) letter
pop codes to be consistant?

I like the idea of using the ICAO/IATA identifier of the nearest 
(major) airport as Paul seems to have done.  All the work in 
defining them has already been done.

My question is: who's the audience for this info?  

-- 
David Carmean                                           <dlc () avtel net>
Avtel Communications, Santa Barbara, CA                 +1-805-730-7740
  Opinions herein are those of the author only, unless otherwise noted
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