Bill Manning writes -
>
> The basic problem here is that people are -STILL- thinking in terms
> of classfull addressing. These things aren't "C" addresses, they
> are /24 prefixes.
>
> Now when we start carving up /8 space into /24 allocations, that will
> be interesting.
>
>
True, but somewhat of a pink elephant.
Classless aggregation is mostly an 'external' routing feature, insofar
as private networks are concerned. The idea of classless aggregation
is more of an 'internet end-to-end' routing mechanism, at least for the
moment. While there are certainly valid (and valuable) methods for
summarizing routes internally, we will begin to see more and more
folks opting for RFC-1597 addressing internally, while announcing
one or two valid networks (or CIDR blocks) to the Internet community.
This is where many folks are currently looking to, perhaps foolishly,
combine the functionality of a firewall, proxy services, DNS and mail
tosser.
I totally agree with Bill in that people really need to stop thinking
of IP address space as classful, and beging to think of it as classless.
The down-side to this is that there are thousands of networks using
classful routing internally and unable (for whatever reason) to use
BGP(4) to summarize and announce aggregate networks to the remainder
of The World. Most of this summarization is now being done by the
ISP.
Philosophies abound. ,-)
- paul
_______________________________________________________________________________
Paul Ferguson
US Sprint tel: 703.689.6828
Managed Network Engineering internet: paul @
hawk .
sprintmrn .
com
Reston, Virginia USA http://www.sprintmrn.com
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