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$ sysctl net.ipv4.ip_forward

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$ sudo sysctl -w net.ipv4.ip_forward=1

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$ sudo ifconfig eth0 <¹«¹²IPµØµã> netmask <¹«¹²×ÓÍøÑÚÂë>
$ sudo ifconfig eth1 <˽ÓÐIPµØµã> netmask <˽ÓÐ×ÓÍøÑÚÂë>

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$ sudo ifconfig eth0 192.168.0.100 netmask 255.255.255.0
$ sudo ifconfig eth1 10.0.0.1 netmask 255.255.255.0

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$ sudo iptables -A FORWARD -o eth0 -i eth1 -s 10.0.0.0/24 -m conntrack --ctstate NEW -j ACCEPT
$ sudo iptables -A FORWARD -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
$ sudo iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE

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$ sudo iptables-save > /etc/iptables/rules.v4

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$ sudo nano /etc/sysctl.conf

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#net.ipv4.ip_forward=1

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net.ipv4.ip_forward=1

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$ sudo sysctl -p

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