What I can do is leave the old server up at its old address and have it continue forwarding packets that are still sent to it from people who didn't get the word, and contact them to get them to update before I have to shut down the old machine. We'll send their inbound traffic to them from the new machine, but it's anybody's guess if they'll get it because of firewalling.
I really can't do anything about the outbound addresses being different though, since the two machines are on distinctly different subnets and I can't change the campus backbone. I've already had to hassle the campus networking folks to get the RPF disabled, and I really don't like to bother them. - Brian
On Fri, May 26, 2017 at 01:23:29PM -0700, Tom Hayward wrote:
Can you anycast the old address from the new server so there's no "cutoff" during the transition?