我有 epel repo 并安装了它。当我想确保它已经安装时，它显示“包 epel-release-6-8.noarch 已安装”。
[root@static ~]# rpm -ivh epel-release-6-8.noarch.rpm
Preparing... ########################################### [100%]
package epel-release-6-8.noarch is already installed
但是我不能安装一些放在这个存储库中的包，比如 unrar rar aria2c
[root@static ~]# yum install rar unrar
Loaded plugins: fastestmirror, refresh-packagekit
Setting up Install Process
Loading mirror speeds from cached hostfile
* base: ftp.antilo.de
* epel: mirror.wiuwiu.de
* extras: mirror.ratiokontakt.de
* updates: mirror.ratiokontakt.de
No package rar available.
No package unrar available.
Error: Nothing to do
我应该怎么办？是centos6.9