On Fri, Jun 02, 2017 at 05:14:57PM +0300, Marius Petrescu wrote:
About that old gateway traffic: remember that all replies from the internet still return via the old gw, since that is the official 44.0.0.0/8 route, and commercial ISPs and core routers don't use connection tracking of any kind.
It's not the traffic from 44.0.0.0/8 to the gateways that concerns me (that traffic is expected for now), it's the traffic in the other direction, outbound from the various gateways to old amprgw to be routed to 44.0.0.0/8 that is the concern. That path will stop working on Monday.
If the AS BGP announcement of the new 44.0.0.0/8 will propagate, this will cease.
Both old and new amprgw are behind the same border router. I believe the BGP announcement will not change at all, what's scheduled is merely an on-campus internal routing change to switch the 'next-hop' route destination in the border router from old to new. We'll still be publicly announcing the same path to 44.0.0.0/8 via our border router as before. - Brian