Linux防火墙配置入门必学
RedHatLinux为添加系统安全性提供了防火墙维护。防火墙存在于你的计算机和网络之间，用来断定网络中的远程用户有权访问你的计算机上的哪些资源。一个准确配置的防火墙能够极大地添加你的系统安全性。为你的系统选择恰当的安全级别。
「高档」
假如你选择了「高档」，你的系统就不会承受那些没有被你详细指定的连接(除了默认设置外)。只要以下连接是默认许可的:
DNS回答
DHCP—任何使用DHCP的网络接口都能够被相应地配置。
(RedHatLinux provides firewall maintenance for adding system security. Firewalls exist between your computer and the network to determine which resources on your computer remote users on the network have access to. A properly configured firewall can greatly increase your system security.
Choose the appropriate security level for your system.
"Premium"
If you choose "High", your system will not accept connections that are not specified by you (except for the default settings). As long as the following connections are permitted by default:
DNS answer
DHCP—Any network interface that uses DHCP can be configured accordingly.)
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