linux 单网卡配置NAT共享上网

echo "1" >/proc/sys/net/ipv4/ip_forward

iptables -F

iptables -F -t nat

iptables -P FORWARD DROP

iptables -A FORWARD -s 192.168.1.0/24 -j ACCEPT

iptables -A FORWARD -i eth0 -m state --state ESTABLISHED,RELATED -j ACCEPT

iptables -t nat -A POSTROUTING -o eth0 -s 192.168.1.0/24 -j SNAT --to 外网IP

或

echo "1" >/proc/sys/net/ipv4/ip_forward

iptables -t nat -A POSTROUTING -j SNAT --to IP