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| | To be clearer, and to follow the recommendation of the FSF, we include
a full header rather than a single sentence. | 
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| | 'syslog' is meant for the messages generated internally by syslogd,
whereas 'user' is for user-level messages. | 
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| | We use ESP only, so other protocols shouldn't be ACCEPTed. | 
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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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| | Also, added some options:
    -f force:   no confirmation asked
    -c check:   check (dry-run) mode
    -v verbose: see the difference between old and new ruleset
    -4 IPv4 only
    -6 IPv6 only | 
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