iptables -A INPUT -p tcp --dport 8080 -j ACCEPT
#出栈规则
iptables -A OUTPUT -p tcp --sport 8080 -j ACCEPT
禁止某个IP访问
iptables -A INPUT -p tcp -s 192.168.1.2 -j DROP
删除规则
iptables -D INPUT 2 #删除INPUT链编号为2的规则
参数讲解：
-A 添加一条规则
-p 指定协议，我们常用的tcp 协议，当然也有udp，例如53端口的DNS
--dport 进入端口，当数据从外部进入服务器为目标端口
--sport 出入端口，数据从服务器出去，则为数据源端口使用
-j 就是指定是 ACCEPT 接收，或者 DROP 不接收
-s 指定来源IP等（如192.168.1.2）
具体看iptables --help
Usage: iptables -[ACD] 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 chainAppend to chain
--check -C chainCheck for the existence of a rule
--delete -D chainDelete 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)
Options:
[!] --proto-p protoprotocol: by number or name, eg. `tcp'
[!] --source -s address[/mask][...] source specification
[!] --destination -d address[/mask][...] destination specification
[!] --in-interface -i input name[+] network interface name ([+] for wildcard)
--jump -j target target for rule (may load target extension)