#!/usr/bin/env ansible-playbook
---
- hosts:
    - edge-1.back.infra.auro.re
    - edge-2.back.infra.auro.re
    - infra-1.back.infra.auro.re
    - infra-2.back.infra.auro.re
    - vpn-1.back.infra.auro.re
  roles:
    - ip_forward
...