Re: Extending a /64 (ATN/IPS worked example)

[Philip Homburg <[e-mail]>]

> Each aircraft operator could individually register (e.g.) a /32
> with an RIR for their Home Network Prefix. However, there are more
> than 5,000 airlines and if you want to have firewall rules that
> refer to "all uplink packets", an un-coordinated registration of
> Home Network Prefixes would lead to a big configuration maintenance
> problem for every firewall in the ATN/IPS. The 
> 
> I believe that American Airlines currently has the largest fleet
> with about 1,300 aircraft. You would need a minimum of 11 bits for
> this fleet - rounded up to 12 for a nibble boundary.

This a clear example of a bad addressing plan. If you have 5000 airlines and
the biggest has 1300 aircraft then you don't give all tiny airlines the 
same amount of space you need for the biggest.