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2.7. netstat-nat - Show the natted connections on a linux iptable firewall

neo@monitor:~$ sudo netstat-nat
Proto NATed Address                  Destination Address            State
tcp   10.8.0.14:1355                 172.16.1.25:ssh                ESTABLISHED
tcp   10.8.0.14:1345                 172.16.1.63:ssh                ESTABLISHED
tcp   10.8.0.14:1340                 172.16.1.46:ssh                ESTABLISHED
tcp   10.8.0.14:1346                 172.16.1.25:ssh                ESTABLISHED
tcp   10.8.0.14:1344                 172.16.1.62:ssh                ESTABLISHED
tcp   10.8.0.14:1343                 172.16.1.48:ssh                ESTABLISHED
		

你也同时可以使用下面命令查看

$ cat /proc/net/ip_conntrack
$ cat /proc/net/nf_conntrack