[c-nsp] Large networks

[Mikael Abrahamsson]

On Wed, 26 Aug 2009, Ivan Pepelnjak wrote:

> The only disadvantage of this approach is that you waste up to 75% of 
> the address space (assuming you have one server per customer). If you 
> want to do some really weird things you could configure mismatched 
> subnet masks on servers and routers, use host routes to point toward the 
> servers ... This will reclaim almost all the address space, but result 
> in somewhat more complex addressing and routing.

It's not weird.

<http://www.gossamer-threads.com/lists/nanog/users/116897#116897>

If you do it like that with local-proxy-arp then you can have multiple 
vlans per IP subnet, so you get L2 isolation between customers but you do 
not waste any IP addresses.

-- 
Mikael Abrahamsson    email: swmike at swm.pp.se