iptables的学习规则

最新推荐文章于 2025-03-30 22:46:44 发布

liuhehe321

最新推荐文章于 2025-03-30 22:46:44 发布

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文章标签： iptable

本文链接：https://blog.youkuaiyun.com/nmjhehe/article/details/84842417

本文展示了在Ubuntu系统中，通过使用iptables命令查看当前系统防火墙的规则配置情况，包括INPUT、FORWARD、OUTPUT、PREROUTING、POSTROUTING等链的默认策略均为ACCEPT，这表明所有网络流量在没有特定规则的情况下都会被允许通过。

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root@ubuntu-128:~# iptables -L
Chain INPUT (policy ACCEPT)
target     prot opt source               destination

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination
root@ubuntu-128:~# iptables -t nat -L
Chain PREROUTING (policy ACCEPT)
target     prot opt source               destination

Chain INPUT (policy ACCEPT)
target     prot opt source               destination

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination

Chain POSTROUTING (policy ACCEPT)
target     prot opt source               destination
root@ubuntu-128:~#
root@ubuntu-128:~#
root@ubuntu-128:~# iptables -t mangle -L
Chain PREROUTING (policy ACCEPT)
target     prot opt source               destination

Chain INPUT (policy ACCEPT)
target     prot opt source               destination

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination

Chain POSTROUTING (policy ACCEPT)
target     prot opt source               destination
root@ubuntu-128:~#
root@ubuntu-128:~#
root@ubuntu-128:~# iptables -t raw -L
Chain PREROUTING (policy ACCEPT)
target     prot opt source               destination

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination
root@ubuntu-128:~#