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- An IPsec <b>transport-mode</b> connection between the natted host <b>alice</b>
- and gateway <b>sun</b> is successfully set up. The client <b>venus</b> behind
- the same NAT as client <b>alice</b> also establishes the same <b>transport-mode</b>
- connection. <b>sun</b> uses the connmark plugin and a <b>%unique</b> mark on
- the CHILD_SAs to select the correct return path SA using connection tracking.
- This allows <b>sun</b> to talk to both nodes for client initiated flows, even
- if the SAs are actually both over <b>moon</b>.<br/>
- To test the connection, both hosts establish an SSH connection to <b>sun</b>.
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