>However, once you start to use one of these private network addresses,
>you are setting yourself up for renumbering (or worse). In today's
>corporate environment, large organizations tend to grow by taking
>over other organizations in order to acheive economies of scale.
>Having to have firewalls between different parts of the same
>orgnaization (to handle the routing) somewhat reduces the advantages
>of the merger.
I know of one major corporation whose auditors dictated firewalls between
Also if the organizations merge to the extent of moving people, as happened
with me coming from AMC to Chrysler, there is massive renumbering as it is.
Finally this issue is (or was) covered in the RFC as a down-side.