sees the subnet behind <b>moon</b> as <b>10.8.0.0/14</b>. The necessary network mappings are
done on gateway <b>sun</b> using the iptables <b>MARK</b> and <b>NETMAP</b> targets.
<p/>
-Upon the successful establishment of the IPsec tunnel, on gateway <b>moon</b> the directive
-<b>leftfirewall=yes</b> automatically inserts iptables-based firewall rules that let pass
-the tunneled traffic whereas on gateway <b>sun</b> the script indicated by
-<b>leftupdown=/etc/mark_updown</b> inserts iptables rules that set marks defined in the
-connection definition of <b>ipsec.conf</b> both on the inbound and outbound traffic, create
-the necessary NETMAP operations and forward the tunneled traffic.
+Upon the successful establishment of the IPsec tunnel, on gateway <b>moon</b> the updown
+script automatically inserts iptables-based firewall rules that let pass
+the tunneled traffic. On gateway <b>sun</b>, a custom updown script
+inserts iptables rules that create the necessary NETMAP operations and forward the
+tunneled traffic.
<p/>
In order to test both tunnel and firewall, client <b>alice</b> behind gateway <b>moon</b>
pings client <b>bob</b> located behind gateway <b>sun</b> and vice versa.