Do you know you can have DENY FROM ALL by default in any IPv4 firewall?
Do you know what you would be hardly pressed to find a router without firewall not only in the year 2022, but in the year 2012 too, when there was 10G *switches* capable of routing AND firewalling traffic almost at the line rate?
Exposing your LAN configuration for the whole world to see is insanity. (Yes, we sometimes do this, but only because we still don't have sane VPN solutions here in the year 2022.)
You can have the public IPs on everything in your LAN... and still it would be completely inaccessible to the outside world. Because you know, firewalls exists.
> Exposing your LAN configuration for the whole world to see is insanity
Bullshit. BGP doesn't 'expose' your internal routing configuration and there is absolutely no other way for someone to see how exactly the things in your network. OSPF could be used for it, but it requires: 1) being right next to your router 2) be configured to send on the external interface.
Do you know what you would be hardly pressed to find a router without firewall not only in the year 2022, but in the year 2012 too, when there was 10G *switches* capable of routing AND firewalling traffic almost at the line rate?