On 01/24/2015 10:54 PM, Marius Cornea wrote:
 Hi Vedsar,
 Try disabling IPv6 if not using it, it appears that you're trying to
 acess the repo by its IPv6 address. 
mirrorlist.centos.org has an IPv6 address so should work:
mirrorlist.centos.org.	216	IN	AAAA	2a02:2498:1:3d:5054:ff:fed3:e91a
I have seen package installs fail sometimes too so I now use a local 
mirror. Try running packstack again or failing that you can also install 
those packages manually and then rerun packstack (with the same answer 
file).
Cheers,
Patrick