On 3/11/21 5:22 AM, Nico Schottelius wrote:
Another question I have is whether such ULA allocations will realistically remain local.ULAs are unlikely staying local, as we have seen with radio networks in Germany. Tunnels are being used to interconnect remote cities and non-collision (not necessarily public routing) are a primary concern.
Despite the name, there's no reason that ULAs should stay local. As long as they are properly chosen, it's perfectly reasonable to route them privately between cooperating networks, and IMO this is part of their design. One of the problems with RFC 1918 addresses in IPv4 was that enterprises had a need to route traffic between networks each using that space. The resulting address collisions generally required explicit NAT configurations to work around, and these were failure-prone and difficult to manage. ULAs were intended in part to remedy this problem.
Keith
