Server S (219.237.60.1)
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+---------------+----------------+--------------+---------------+
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NAT A (外网IP:202.187.45.3) NAT B (外网IP:187.34.1.56)
(内网IP:192.168.0.1) (内网IP:192.168.0.1)
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Client A (192.168.0.20:4000) Client B (192.168.0.10:40000)