North American Network Operators Group

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Re: Fwd: 41/8 announcement

  • From: william(at)
  • Date: Fri May 26 10:45:19 2006

On Fri, 26 May 2006, Bill Woodcock wrote:

     On Fri, 26 May 2006, Mikisa Richard wrote:
   > Can't be sure what they did, but I received an e-mail asking me to check
   > on my connectivity to them and well, it worked.

Presumably they're double-natting.  I had to do that once for Y2K
compliance for three large governmental networks that were all statically
addressed in net-10 and wouldn't/couldn't renumber in time.  In fact,
there were _specific hosts_ which had the same IP address, and _had to
talk to each other_.  Gross.  But it can be done.
Please explain how. I simply can't imagine my computer communicating
with another one with exactly same ip address - the packet would never
leave it. The only way I see to achieve this is to have dns resolver
on the fly convert remote addresses from same network into some other
network and then NAT from those other addresses.

William Leibzon
Elan Networks
[email protected]