保存规则：iptables-save > /etc/iptables-script
恢复规则：iptables-restore < /etc/iptables-script
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| # Generated by iptables-save v1.4.21 on Mon Nov 21 14:49:30 2016
*nat
:PREROUTING ACCEPT [75958158:4710517785]
:INPUT ACCEPT [11156433:697999260]
:OUTPUT ACCEPT [11270560:679018758]
:POSTROUTING ACCEPT [0:0]
-A POSTROUTING -j MASQUERADE
COMMIT
# Completed on Mon Nov 21 14:49:30 2016
# Generated by iptables-save v1.4.21 on Mon Nov 21 14:49:30 2016
*filter
:INPUT ACCEPT [1937717187:1020106795408]
:FORWARD ACCEPT [2772458722:1915560771769]
:OUTPUT ACCEPT [2100892309:1998825790936]
COMMIT
# Completed on Mon Nov 21 14:49:30 2016
|
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| > iptables-restore < iptables.conf
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配置网卡转发
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| echo 1 > /proc/sys/net/ipv4/ip_forward
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