On Mar 27, 2022, at 5:00 AM, Masataka Ohta <mohta@necom830.hpcl.titech.ac.jp> wrote:
james.cutler@consultant.com wrote:
I have yet to find an economical way to manage a business merger involving two large rfc1918 networks where end to end peering is required and which partially or fully overlap.
As you mention "overlap", you should mean business merger implies network and office merger, which causes relocation of a office,
Overlap here refers to network address space address space, a fundamental part of this discussion. Formerly separate networks containing separately managed rfc1918 spaces are prone to overlap require ingenious solutions for end-to-end traffic without renumbering. Mergers do not cause relocation of an office, which is not germane to this discussion.
which, in general, requires provider change and renumbering of globally unique addresses, unless you own /24.
Moot since we are not discussing office moves. However, renumbering to global IPv6 addressing allows easy coexistence with the global Internet
Ignoring short-sighted financial management views, the best long term solution is globally unique IPv6 addressing wherever possible.
See above.
See previous.
Or, if you mean network merger remotely with VPN, small number of hosts requiring E2E transparency may be renumbered, but it is not so painful.
Nobody mentioned VPN or limiting the number of hosts requiring E2E. “not so painful” is not meaningful metric in this discussion.
Masataka Ohta