firewall CentOS

最新推荐文章于 2025-08-15 09:36:38 发布

转载最新推荐文章于 2025-08-15 09:36:38 发布 · 51 阅读

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原文链接：http://www.cnblogs.com/greencolor/archive/2011/11/13/2247400.html

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#网络

本文详细介绍了iptables防火墙的基本配置情况，包括默认策略、链设置及规则应用等内容。通过查看iptables的状态，可以看到不同链（如INPUT、FORWARD、OUTPUT等）的默认策略以及具体的规则详情。此外，还演示了如何启动和停止iptables服务。

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sudo /etc/init.d/iptables status

Table: filter Chain INPUT (policy ACCEPT) num target prot opt source destination 1 RH-Firewall-1-INPUT all -- 0.0.0.0/0 0.0.0.0/0

Chain FORWARD (policy ACCEPT) num target prot opt source destination 1 RH-Firewall-1-INPUT all -- 0.0.0.0/0 0.0.0.0/0

Chain OUTPUT (policy ACCEPT) num target prot opt source destination

Chain RH-Firewall-1-INPUT (2 references) num target prot opt source destination 1 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 2 ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0 icmp type 255 3 ACCEPT esp -- 0.0.0.0/0 0.0.0.0/0 4 ACCEPT ah -- 0.0.0.0/0 0.0.0.0/0 5 ACCEPT udp -- 0.0.0.0/0 224.0.0.251 udp dpt:5353 6 ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 udp dpt:631 7 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:631 8 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED 9 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:22 10 REJECT all -- 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited

sudo /etc/init.d/iptables start

Applying iptables firewall rules: [ OK ] Loading additional iptables modules: ip_conntrack_netbios_n[ OK ]

sudo /etc/init.d/iptables stop

Flushing firewall rules: [ OK ] Setting chains to policy ACCEPT: filter [ OK ] Unloading iptables modules: [ OK ]

转载于:https://www.cnblogs.com/greencolor/archive/2011/11/13/2247400.html