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服务器通常会安装防火墙,Debian上有很防火墙,Iptables为比较常用的免费防火墙,Iptables能够提供数据包过滤,网络地址转换(NAT)等功能.在Debian上手工配置Iptables的资料比较少,本文做一个详细的介绍.

第一步,首先确定你的系统已经安装Iptables.打开SSH终端,输入

whereis iptables

如果能看到如下类似信息,说明你已经安装了iptables
iptables: /sbin/iptables /usr/share/iptables /usr/share/man/man8/iptables.8.gz
如果不是这个提示,或者没有任何提示,那你的Debian上可能没有安装iptables
请使用如下命令安装:

sudo apt-get install iptables

注意:本文所有命令在普通帐号下完成,本普通帐号使用sudo具有root权限,本人不建议直接使用root用户 查看全文…

Introduction
Sudo is a program designed to allow a sysadmin to give limited root privileges to users and log root activity. The basic philosophy is to give as few privileges as possible but still allow people to get their work done.

Debian’s sudo package has the password timeout set to 15 minutes. This means that when you first enter your password, as long as you don’t wait more than 15 minutes between sudo commands, you won’t have to enter it again. The password timeout can be immediately expired with sudo -k. 查看全文…

Config static ip in debian,There are two files need to be modified,the one is “/etc/network/interfaces”,the other is “/etc/resolv.conf”./etc/network/interfaces used to config IP,netmask,gateway and so on,/etc/resolv.conf used to config DNS server address。
these are two examples： 查看全文…