3 lines for linux nat

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iptables nat table:

/sbin/iptables -t nat -A PREROUTING -d 172.17.72.6 -j DNAT --to-destination 10.21.1.6
/sbin/iptables -t nat -A POSTROUTING -s 10.21.1.6 -j SNAT --to-source 172.17.72.6
/sbin/iptables -t nat -A FORWARD -s 172.17.72.2 -j ACCEPT