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We use a dedicated instance for each role: MDA, MTA out, MX, etc.
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${distro_codename} doesn't work properly there, so we put stable and/or
oldstable instead.
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Replaced [ -n "$string" ] with [ "$string" ], and [ -z "$string" ] with
[ ! "$string" ].
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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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Also, use ESP tunnel mode instead of transport mode.
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I.e., as packets are treated along the way: mangle -> nat -> filter.
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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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These rules are automatically included by third-party servers such as
strongSwan or fail2ban.
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So it doesn't mess with the high-priority rules regarding IPSec.
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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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