North American Network Operators Group

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Re: Selection of Appropriate Local SMTP Relay

  • From: Andrew Brown
  • Date: Tue Jan 11 14:31:52 2000

> | > Ny using octet boundaries, you're making an inference that the IP
> | > addresses are being used in a classful fashion. It's doubtful this will
> | > be the case in today's network.
> | 
> | I don't buy your logic. By that reasoning, PTR records are not supported
> | on today's network either, since they also work on octet boundaries.
> | 
>Yes but the methods for delegating PTR records that are smaller then a /24
>are ugly hacks.  See RFC 2317 if you don't already know why.

actually...the real problem is that since ip addresses aren't
necessarily allocated on octet boundaries, you'd need more than one
set of mx records at the boundary point in the dns.  just having        MX 10
                                   MX 20

wouldn't work if was divided up into a few /18 or /19
blocks and used by different providers.

>Sorry, off topic, just had to get my gripe in there.

perhaps.  :)

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