$ sudo sysctl -w net.inet.ip.forwarding=1
$ sudo natd -interface en1
$ sudo ipfw add divert natd ip from any to any via en1
mac下设置nat
$ sudo sysctl -w net.
$ sudo sysctl -w net.
$ sudo sysctl -w net.inet.ip.forwarding=1
$ sudo natd -interface en1
$ sudo ipfw add divert natd ip from any to any via en1