On Thu, Feb 10, 2011 at 10:46 PM, Ricky Beam <jfbeam@gmail.com> wrote:
On Thu, 10 Feb 2011 11:43:50 -0500, Matthew Kaufman <matthew@matthew.at> wrote:
There is no one universal "global routing table". They probably appear in someone's routing table, somewhere... just not yours.
Using public address space for private networking is a gross misuse of the resource.
Ricky, One example I heard was a generic financial exchange connected to perhaps a hundred other companies. Those companies also connect to the Internet but the exchange itself does not. It's valuable for the exchange to use addressing which will not conflict with any of its customers' RFC1918 use or overlap any Internet destinations they want to access. This is why ULA in IPv6 has statistical uniqueness -- so that organizations with similar requirements don't need to use Internet-routable addresses. We can't backport ULA into IPv4 private addressing; there aren't enough addresses for the math to work. So we either make such folks jump through all kinds of hoops to get their networks to function, or we assign addresses that could otherwise be used on the big-I Internet. Regards, Bill Herrin -- William D. Herrin ................ herrin@dirtside.com bill@herrin.us 3005 Crane Dr. ...................... Web: <http://bill.herrin.us/> Falls Church, VA 22042-3004