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[root@server ~]# yum install ipset
Loaded plugins: fastestmirror
Setting up Install Process
Loading mirror speeds from cached hostfile
* base: centos.datente.com
* epel: mirrors.n-ix.net
* extras: mirror.daniel-jost.net
* updates: mirror.softaculous.com
Package ipset-6.11-4.el6.x86_64 already installed and latest version
Nothing to do