Network.md

 sudo update-alternatives --list iptables
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 sudo update-alternatives --config iptables
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 sudo mv /usr/sbin/iptables /root/scripts
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 sudo ln -s /usr/sbin/iptables-legacy /usr/sbin/iptables
 
 
 iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
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 iptables -A FORWARD -i eth1 -o eth0 -m state --state RELATED,ESTABLISHED -j ACCEPT
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 iptables -A FORWARD -i eth1 -o eth0 -j ACCEPT
 
 vi /etc/dhcpd.conf
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 interface eth1
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 static ip_address=172.16.12.100 /24
 
 apt-get install -y dnsmasq
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 vi /etc/dnsmasq.conf
 
 interface=eth1
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 dhcp-range=172.16.12.10,172.16.12.50,255.255.255.0,24h
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 dhcp-option=option:router,172.16.12.100
 
 service dnsmasq restart