我分别在端口8006和8007上托管特殊的HTTP和HTTPS服务。我使用iptables来“激活”服务器;即路由传入的HTTP和HTTPS端口:
iptables -A INPUT -i eth0 -p tcp --dport 80 -j ACCEPT
iptables -A INPUT -i eth0 -p tcp --dport 443 -j ACCEPT
iptables -A INPUT -i eth0 -p tcp --dport 8006 -j ACCEPT
iptables -A INPUT -i eth0 -p tcp --dport 8007 -j ACCEPT
iptables -A PREROUTING -t nat -i eth0 -p tcp --dport 80 -j REDIRECT --to-port 8006
iptables -A PREROUTING -t nat -i eth0 -p tcp --dport 443 -j REDIRECT --to-port 8007
iptables -A OUTPUT -t nat -d 127.0.0.1 -p tcp --dport 80 -j REDIRECT --to-ports 8006
iptables -A OUTPUT -t nat -d 127.0.0.1 -p tcp --dport 443 -j REDIRECT --to-ports 8007
这就像一个咒语。然而，我想创建另一个脚本，再次禁用我的服务器;例如，将iptables恢复到运行上述代码行之前的状态。然而，我很难弄清楚删除这些规则的语法。唯一有效的方法是同花:
iptables -F
iptables -X
iptables -t nat -F
iptables -t nat -X
iptables -t mangle -F
iptables -t mangle -X
iptables -P INPUT ACCEPT
iptables -P FORWARD ACCEPT
iptables -P OUTPUT ACCEPT
但这也会删除其他不需要的iptables规则。
下面是删除与搜索匹配的iptables规则的一行代码。本示例搜索与IP地址192.168.1.27匹配的所有规则，并删除所有规则。您可以在自己的搜索条件中编辑该IP地址。
eval `iptables --list-rules | grep '192.168.1.27' | sed 's/^-A /iptables -D /g;s/$/;/g'`
工作原理:
它使用这个问题的公认答案，并使用-D而不是-A运行规则。
iptables --list-rules lists all the existing rules. Even if you added them with -I or -R, this list shows them all with -A
| grep '192.168.1.27' filters the list to just the rules that you want removed (in this case the rules for some specific IP address.)
| sed does a search and replace
s/^-A /iptables -D /g replaces the -A at the start of each rule with iptables -D so that it becomes an executable command to remove the rule.
s/$/;/g replaces the end of each rule with a semi-colon to separate multiple commands when they are run
eval ... takes all that output and runs it as a script.
你也可以使用规则的编号(——line-numbers):
iptables -L INPUT --line-numbers
示例输出:
Chain INPUT (policy ACCEPT)
num target prot opt source destination
1 ACCEPT udp -- anywhere anywhere udp dpt:domain
2 ACCEPT tcp -- anywhere anywhere tcp dpt:domain
3 ACCEPT udp -- anywhere anywhere udp dpt:bootps
4 ACCEPT tcp -- anywhere anywhere tcp dpt:bootps
所以如果你想删除第二条规则:
iptables -D INPUT 2
更新
如果你使用(d)一个特定的表(例如nat)，你必须把它添加到删除命令(谢谢@ThorSummoner的评论)
sudo iptables -t nat -D PREROUTING 1
下面是删除与搜索匹配的iptables规则的一行代码。本示例搜索与IP地址192.168.1.27匹配的所有规则，并删除所有规则。您可以在自己的搜索条件中编辑该IP地址。
eval `iptables --list-rules | grep '192.168.1.27' | sed 's/^-A /iptables -D /g;s/$/;/g'`
工作原理:
它使用这个问题的公认答案，并使用-D而不是-A运行规则。
iptables --list-rules lists all the existing rules. Even if you added them with -I or -R, this list shows them all with -A
| grep '192.168.1.27' filters the list to just the rules that you want removed (in this case the rules for some specific IP address.)
| sed does a search and replace
s/^-A /iptables -D /g replaces the -A at the start of each rule with iptables -D so that it becomes an executable command to remove the rule.
s/$/;/g replaces the end of each rule with a semi-colon to separate multiple commands when they are run
eval ... takes all that output and runs it as a script.
假设要删除NAT规则，
使用下面的命令列出附加的IPtables，
# sudo iptables -L -t nat -v
Chain PREROUTING (policy ACCEPT 18 packets, 1382 bytes)
pkts bytes target prot opt in out source destination
7 420 DNAT tcp -- any any anywhere saltmaster tcp dpt:http to:172.31.5.207:80
0 0 DNAT tcp -- eth0 any anywhere anywhere tcp dpt:http to:172.31.5.207:8080
如果您想从IPtables中删除nat规则，只需执行以下命令，
# sudo iptables -F -t nat -v
Flushing chain `PREROUTING'
Flushing chain `INPUT'
Flushing chain `OUTPUT'
Flushing chain `POSTROUTING'
然后，你可以验证，
# sudo iptables -L -t nat -v
