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| | Packets originating from our (non-routable) $ipsec are marked; there is
no xfrm lookup (i.e., no matching IPSec association), the packet will
retain its mark and be null routed later on, thanks to
    ip rule  add fwmark "$secmark" table 666 priority 666
    ip route add blackhole default table 666 | 
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| | At the each IPSec end-point the traffic is DNAT'ed to / MASQUERADE'd
from our dedicated IP after ESP decapsulation. Also, some IP tables
ensure that alien (not coming from / going to the tunnel end-point) is
dropped. | 
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| | These rules are automatically included by third-party servers such as
strongSwan or fail2ban. | 
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| | update-firewall.sh -c does not update the firewall, but returns a
non-zero value iff. running it without the switch would modify it. | 
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|  | To run the playbook:
  cd ./ansible
  ansible-playbook -i vms site.yml |