A slight call to order (Re: Internic address allocation policy )

Karl Denninger karl at mcs.com
Mon Mar 20 17:21:12 UTC 1995

> First, may I ask that when you reply to a message from the nanog mailing list,
> you edit the headers so that they say "To: nanog at merit.edu" and have no CC?
> Right now there is a strong penalty for anyone who adds to a thread, since we
> will be on the CC list forever (getting two copies) even when it moves to a
> different topic.  We are all on the nanog list, no need to CC us.

Ok :-)

>Second, I've seen Karl and now Alan misuse a term.  I'll pick on Alan since his
>message is right in front of me, but the complaint is general (sorry Alan!):
> > Taking a relatively small chunk of the remaining address space
> > (say, 210.*.*.*) gives us 64k addresses to hand out in convenient
> That's 16M addresses, not 64K addresses.  We should not equivocate "addresses"
> and "Class C networks".  210.*.*.* has 2^24 (minus subnet zero and broadcast
> lossage) addresses -- 16M.  210.*.*.* has 2^16 "Class C networks" -- 64K.  We
> must not assume that every customer will get a Class C -- many will get just a
> subnet since they will only have a handful of hosts.  I know of several 
> providers who are chopping things up on nybble boundaries (16 hosts/net, or
> actually 14 with the subnet zero and broadcast taken out).

Not me!

I consider a "Class B equivalent" to be 256 NETWORKS, by the common use of
the term, but 65K *addresses*.

For many of our account classifications we chop up network numbers to
significantly smaller pieces.  For some of them we chop them up to the
*address* level, that is, ONE ADDRESS (  For others we chop it up
to the four-address level (mask, yielding three usable
hosts if you can use "zero" (two if not) and for others we hand out 
larger blocks, including full Class "C"s.  

Right now, for political reasons, anything that a customer can take away
from us is a class "C", primarily because not all providers are CIDR
capable and the SWIP process is not really good for sub-C blocks, and 
until the backbone folks start insisting on this (we do for resale 
connections) this is the only way to insure that a customer doesn't
get screwed somewhere down the line.

A customer with a single SLIP connection gets one *address*; that is,, and that's it.  Our backbone routes that internally.  Yes, that 
is hell on the routers.  However, it is also efficient on address space.

Karl Denninger (karl at MCS.Net)| MCSNet - The Finest Internet Connectivity
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