Linux iptables命令詳解

iptables命令主要是設置防火牆信息的

常見命令參數

Usage: iptables -[AD] chain rule-specification [options]
       iptables -I chain [rulenum] rule-specification [options]
       iptables -R chain rulenum rule-specification [options]
       iptables -D chain rulenum [options]
       iptables -[LS] [chain [rulenum]] [options]
       iptables -[FZ] [chain] [options]
       iptables -[NX] chain
       iptables -E old-chain-name new-chain-name
       iptables -P chain target [options]
       iptables -h (print this help information)

Commands:
Either long or short options are allowed.
  --append  -A chain            Append to chain
  --delete  -D chain            Delete matching rule from chain
  --delete  -D chain rulenum
                                Delete rule rulenum (1 = first) from chain
  --insert  -I chain [rulenum]
                                Insert in chain as rulenum (default 1=first)
  --replace -R chain rulenum
                                Replace rule rulenum (1 = first) in chain
  --list    -L [chain [rulenum]]
                                List the rules in a chain or all chains
  --list-rules -S [chain [rulenum]]
                                Print the rules in a chain or all chains
  --flush   -F [chain]          Delete all rules in  chain or all chains
  --zero    -Z [chain [rulenum]]
                                Zero counters in chain or all chains
  --new     -N chain            Create a new user-defined chain
  --delete-chain
            -X [chain]          Delete a user-defined chain
  --policy  -P chain target
                                Change policy on chain to target
  --rename-chain
            -E old-chain new-chain
                                Change chain name, (moving any references)

常見命令展示

1、查看

iptables -nL --line-number

-L 查看當前表的所有規則，默認查看的是filter表，如果要查看NAT表，加上-t NAT參數
-n 不對ip地址進行反查，加上這個參數顯示速度會快很多
-v 輸出詳細信息，包含通過該規則的數據包數量，總字節數及相應的網絡接口
–line-number 顯示規則的序列號，這個參數在刪除或修改規則時會用到

 

2、添加

添加規則有兩個參數：-A和-I。其中-A是添加到規則的末尾；-I可以插入到指定位置，沒有指定位置的話默認插入到規則的首部。  

# 2.1添加一條規則到尾部：
iptables -A INPUT -s 192.168.1.5 -j DROP
# 2.2插入一條規則到第三行，將行數直接寫到規則鏈的后面
iptables -I INPUT 3 -s 192.168.1.3 -j DROP

3、刪除

# 刪除第二行規則 iptables -D INPUT 2

4、修改

# 修改用-R參數
iptables -R INPUT 3 -j ACCEPT