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1.命令行手册查缺补漏
2.开始练习,从最陌生的参数练习开启
2.1 --list-rules -S #xff1a;打印链或所有链中的规则
2.2 --zero -Z 链或所有链中的零计数器 2.3 --policy -P 修改默认链的默认规则
2.4 --new -N 接下来练习添加和删除自定义链 1.命令行手册查缺补…
目录
1.命令行手册查缺补漏
2.开始练习,从最陌生的参数练习开启
2.1 --list-rules -S 打印链或所有链中的规则
2.2 --zero -Z 链或所有链中的零计数器 2.3 --policy -P 修改默认链的默认规则
2.4 --new -N 接下来练习添加和删除自定义链 1.命令行手册查缺补漏
[rootovn-center ~]# iptables --help
iptables v1.4.21Usage: 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] chainiptables -E old-chain-name new-chain-nameiptables -P chain target [options]iptables -h (print this help information)Commands:
Either long or short options are allowed.--append -A chain Append to chain--check -C chain Check for the existence of a rule--delete -D chain Delete matching rule from chain--delete -D chain rulenumDelete rule rulenum (1 first) from chain--insert -I chain [rulenum]Insert in chain as rulenum (default 1first)--replace -R chain rulenumReplace 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 targetChange policy on chain to target--rename-chain-E old-chain new-chainChange chain name, (moving any references)
Options:--ipv4 -4 Nothing (line is ignored by ip6tables-restore)--ipv6 -6 Error (line is ignored by iptables-restore)
[!] --protocol -p proto protocol: 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 targettarget for rule (may load target extension)--goto -g chainjump to chain with no return--match -m matchextended match (may load extension)--numeric -n numeric output of addresses and ports
[!] --out-interface -o output name[]network interface name ([] for wildcard)--table -t table table to manipulate (default: filter)--verbose -v verbose mode--wait -w [seconds] maximum wait to acquire xtables lock before give up--wait-interval -W [usecs] wait time to try to acquire xtables lockdefault is 1 second--line-numbers print line numbers when listing--exact -x expand numbers (display exact values)
[!] --fragment -f match second or further fragments only--modprobecommand try to insert modules using this command--set-counters PKTS BYTES set the counter during insert/append
[!] --version -V print package version.2.开始练习,从最陌生的参数练习开启
2.1 --list-rules -S 打印链或所有链中的规则
[rootovn-center ~]# iptables --list-rules
-P INPUT ACCEPT
-P FORWARD ACCEPT
-P OUTPUT ACCEPT
[rootovn-center ~]# iptables -t nat --list-rules
-P PREROUTING ACCEPT
-P INPUT ACCEPT
-P OUTPUT ACCEPT
-P POSTROUTING ACCEPT
[rootovn-center ~]# iptables -t filter -S
-P INPUT ACCEPT
-P FORWARD ACCEPT
-P OUTPUT ACCEPT
-A INPUT -s 10.10.10.3/32 -j DROP
2.2 --zero -Z 链或所有链中的零计数器 2.3 --policy -P 修改默认链的默认规则
在修改了filter表的INPUT默认规则为DROP时直接断网
也就是丢弃了所有一切进入主机的数据包 需要给指定的链修改默认规则而无法一次性全部修改 我们恢复规则继续测试
2.4 --new -N 接下来练习添加和删除自定义链
在filter表上添加一个链
iptables -t filter -N WEB 接着将WEB引用到filter表INPUT链这样凡是目标端口是80443的流量都将经过WEB链的规则 删除自定义链表的时候不能有引用和规则需要清理关系和内部的规则
