On Fri, Jun 19, 2026 at 12:06 PM Gary Sparkes via NANOG < nanog@lists.nanog.org> wrote:
Internal clients are 1:1 NPT'd to provider addresses, and on failover, the internal addressing doesn't change, but all the traffic flips to the other provider's addresses.
And now we've got to have a mechanism to update external DNS for the SMB or Enterprise that hosts their own MX, a remote access server, and all those SSH port forwards the IT guys use to remotely access/manage stuff. I thought I was promised an IPv6 where there were so many dang addresses that every business could have their own *public* /48 with enough room left over to allocate a /48 to every molecule on the planet or whatever. I don't want to renumber everything because I ditch one ISP and switch to another. In IPv4 I don't have to thanks to RFC1918 space. In IPv6 I guess I have fc00::/7 that gets allocated "pseudo-randomly". So in IPv6 I either have to renumber because I ditched some ISP for another...or I have to pay for my addressing space and my ISPs have to support routing my address space, right? -A