Whoa; the 3 network?

Eric Osborne osborne at notcom.com
Wed Dec 24 03:13:40 UTC 1997


Right, but since each border router off of the public Internet can't 
advertise anything smaller than /24 (would *your* router accept an 
advertisement for 3.0.0.0/27?), each seperate office needs at least a /24.
Yeah, NAT can take care of the internal addressing, but you're still stuck 
with the fact that you "only" can have 256 seperate border routers.

I was never arguing that GE needs and/or deserves the full 3.0.0.0, as I have
little or no experience with their network needs.  (I do note, however, that
I can't find *any* of 3.0.0.0/8 in Mae-East via Digex right now).  I believe
it was Lee Ving who said "Let's have a war/We need the space". 


Fini.




eric




> Okay...
> 
> RFC1918 host
>   |
>   |
> border router  <----+
>   |                 |
>   |                 |
> public internet     |
>   |                 |
>   |                 |  IP tunnel between corporate offices
> border router       |  preserving RFC1918 addressing.
>   |                 |
>   |                 |
> RFC1918 host   <----+
> 
> With carefull use of NAT at appropriate points, it is technically
> possible to limit the amount of publicly visible addresses you use to
> (quite conceivably) 2 or 3 traditional class C blocks. Obviously this
> is not necessarily a real world model but you get the picture. I don't
> personally believe that an "enterprise" network should ever require
> more than one (PERHAPS two) /16 networks. When you get to ISPs and
> similar, the need for addresses will rise dramatically but it can
> still be kept under control if you're carefull about maintaining
> hierarchical addressing structures.
> 
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