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1.1 misho 1: The router <b>moon</b> sets up a connection to gateway <b>sun</b> in order 2: to reach the subnet hidden behind <b>sun</b>. The gateway <b>sun</b> assigns a 3: virtual IP address to router <b>moon</b>. A special updown script on <b>moon</b> 4: specified by <b>leftupdown=/etc/nat_updown</b> dynamically inserts a source NAT rule 5: which maps the IP address of client <b>alice</b> to the virtual IP of <b>moon</b>. 6: This allows <b>alice</b> to access client <b>bob</b> via the established IPsec tunnel.