Re:Tell HN: Amazon now owns 3.0.0.0/8
by floatingatoll on Thursday November 08, 2018 @08:37PM
(#18411743)
You can also use a fake IP for the default gateway on a wholly different segment with local segment ARP, or an IPv6 default router with 4-wrapping, or set up a router that uses promiscuous mode to capture all packets it receives from your “default route eth0” host. These are all irregular solutions, though, so I didn’t want to go too deep into the confusing weeds.
That requirement is about how you advertise your routes not how you subnetted the internal network. .0 and .255 of your advertised /24 can work fine as /32s on the server. Using the internet FW to NAT the network and broadcast addresses is another common trick to get more addresses, particularly when you only get an e.g. /29 from a carrier who is just routing that /29 to your specified next hop and 2 more addresses is a big bump.