Iptables: 如何只解决一个 ip 通过某个港口？

iptables -I INPUT \! --src 1.2.3.4 -m tcp -p tcp --dport 777 -j DROP  # if it's not 1.2.3.4, drop it

iptables -N xxx # create a new chain

iptables -A xxx --src 1.2.3.4 -j ACCEPT  # allow 1.2.3.4

iptables -A xxx --src 1.2.3.5 -j ACCEPT  # allow 1.2.3.5

iptables -A xxx --src 1.2.3.6 -j ACCEPT  # allow 1.2.3.6

iptables -A xxx -j DROP  # drop everyone else

iptables -I INPUT -m tcp -p tcp --dport 777 -j xxx  # use chain xxx for packets coming to TCP port 777

-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp -s 1.2.3.4 -d 5.6.7.8 --dport 22 -j ACCEPT