Network Design Advice

[Roy S. Rapoport]

On Wed, 12 Mar 2003, Dean Kao wrote:
> We're redesigning our network and an interesting issue
> came up.  Currently, our wan links in our network are unnumbered
> and we want to number them.  In our design plans, we want to
> designate 10.128/9 to the wan network and subnet that further
> into /21, which allows for 4096 networks.  If we number
> the wan links, it'll only give us 2048 networks (assuming you use
> a /21 for the wan link).  Is there any design tricks that I can use
> so I dont have to use up a whole /21 for just the two ips between
> the routers?  Or am I stuck losing all those ips.

I'll take the honours of being the first to ask a stupid question:

Why not just use /30 networks for WAN links?

This gives you something on the order of 2^21 networks, if I've got my math
right.

-roy