On Friday 01 June 2007, Vince Fuller wrote:
If you think about it, the NAT approach actually offers the possibility of improved routing scalability: site multihomed with NATs connected to each of its providers could use topologically-significant (read "PA") global addresses on the NATs while using the same private address space on their network.
Cisco has a whitepaper entitled "Enabling Enterprise Multihoming with Cisco IOS NAT" that addresses this. See http://www.cisco.com/en/US/tech/tk648/tk361/technologies_white_paper09186a00... as well as RFC2260. There are indeed a few thorny issues with this approach; the largest issue is that all connectivity becomes DNS-dependent and raw IP addresses (from both the inside and outside) become virtually useless. Running servers behind this scheme, while doable, is difficult. -- Lamar Owen Chief Information Officer Pisgah Astronomical Research Institute 1 PARI Drive Rosman, NC 28772 (828)862-5554 www.pari.edu