1. 什么是 linux 源

更新源是 linux 必不可少的软件获取仓库，安装软件时，程序从源获取软件包，才能下载到本地。简单来说就是 linux 的软件库的下载链接。一般我们在使用 linux 系统时都需要恢复官方源和重新设置源的操作来获得更快的更新速度。

2. 国内 kali linux 源

#官方源
deb http://http.kali.org/kali kali main non-free contrib
deb-src http://http.kali.org/kali kali main non-free contrib
deb http://security.kali.org/kali-security kali/updates main contrib non-free
 
#中科大kali源
deb http://mirrors.ustc.edu.cn/kali kali main non-free contrib
deb-src http://mirrors.ustc.edu.cn/kali kali main non-free contrib
deb http://mirrors.ustc.edu.cn/kali-security kali/updates main contrib non-free
 
#新加坡kali源
deb http://mirror.nus.edu.sg/kali/kali/ kali main non-free contrib
deb-src http://mirror.nus.edu.sg/kali/kali/ kali main non-free contrib
deb http://security.kali.org/kali-security kali/updates main contrib non-free
deb http://mirror.nus.edu.sg/kali/kali-security kali/updates main contrib non-free
deb-src http://mirror.nus.edu.sg/kali/kali-security kali/updates main contrib non-free
 
#阿里云kali源
deb http://mirrors.aliyun.com/kali kali main non-free contrib
deb-src http://mirrors.aliyun.com/kali kali main non-free contrib
deb http://mirrors.aliyun.com/kali-security kali/updates main contrib non-free
 
#163 Kali源
deb http://mirrors.163.com/debian wheezy main non-free contrib 
deb-src http://mirrors.163.com/debian wheezy main non-free contrib 
deb http://mirrors.163.com/debian wheezy-proposed-updates main non-free contrib 
deb-src http://mirrors.163.com/debian wheezy-proposed-updates main non-free contrib 
deb-src http://mirrors.163.com/debian-security wheezy/updates main non-free contrib 
deb http://mirrors.163.com/debian-security wheezy/updates main non-free contrib
 
#清华大学源
 deb http://mirrors.tuna.tsinghua.edu.cn/kali kali-rolling main contrib non-free
 deb-src https://mirrors.tuna.tsinghua.edu.cn/kali kali-rolling main contrib non-free 

#上交 Kali源
deb http://ftp.sjtu.edu.cn/debian wheezy main non-free contrib
deb-src http://ftp.sjtu.edu.cn/debian wheezy main non-free contrib 
deb http://ftp.sjtu.edu.cn/debian wheezy-proposed-updates main non-free contrib 
deb-src http://ftp.sjtu.edu.cn/debian wheezy-proposed-updates main non-free contrib 
deb http://ftp.sjtu.edu.cn/debian-security wheezy/updates main non-free contrib 
deb-src http://ftp.sjtu.edu.cn/debian-security wheezy/updates main non-free contrib