いつも忘れるので、memo。。。

iptables -I Chain rulenum(位置)

まずは、位置を確認

$ iptables -L

Chain INPUT (policy ACCEPT)
target     prot opt source               destination
ACCEPT     all  --  anywhere             anywhere            state RELATED,ESTABLISHED
ACCEPT     icmp --  anywhere             anywhere
ACCEPT     all  --  anywhere             anywhere
ACCEPT     tcp  --  anywhere             anywhere            state NEW tcp dpt:ssh
REJECT     all  --  anywhere             anywhere            reject-with icmp-host-prohibited

例）インサートコマンド（-I）で Chain INPUTの4番目に挿入する場合
$ iptables -I INPUT 4 -p tcp --dport 80 -j ACCEPT