Is it possible to put an HSRP configuration on 2 routers that face the internet? Would I eat 3 public addresses doing it?
router 1: 220.127.116.11
router 2: 18.104.22.168
Is this possible?
Assuming that router1 and router2 are connected on a common subnet, which is the Internet facing interfaces, then yes this is possible. And yes it would consume 3 public addresses.
A somewhat different question from "can I do this" is the question of "why would I want to do this". Since HSRP generally is to solve the problem of redundant gateways on the local subnet, what problem is it solving to put it on the Internet facing interfaces?