16 lines
1.1 KiB
Plaintext
16 lines
1.1 KiB
Plaintext
A connection between two identical <b>10.0.0.0/14</b> networks behind the gateways <b>moon</b>
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and <b>sun</b> is set up. In order to make network routing work, the subnet behind <b>moon</b>
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sees the subnet behind <b>sun</b> as <b>10.4.0.0/14</b> whereas the subnet behind <b>sun</b>
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sees the subnet behind <b>moon</b> as <b>10.8.0.0/14</b>. The necessary network mappings are
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done on gateway <b>sun</b> using the iptables <b>MARK</b> and <b>NETMAP</b> targets.
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<p/>
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Upon the successful establishment of the IPsec tunnel, on gateway <b>moon</b> the directive
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<b>leftfirewall=yes</b> automatically inserts iptables-based firewall rules that let pass
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the tunneled traffic whereas on gateway <b>sun</b> the script indicated by
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<b>leftupdown=/etc/mark_updown</b> inserts iptables rules that set marks defined in the
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connection definition of <b>ipsec.conf</b> both on the inbound and outbound traffic, create
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the necessary NETMAP operations and forward the tunneled traffic.
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<p/>
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In order to test both tunnel and firewall, client <b>alice</b> behind gateway <b>moon</b>
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pings client <b>bob</b> located behind gateway <b>sun</b> and vice versa.
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