[Fedora17] "Could not resolve host: mirror.dulug.duke.edu; 이름 혹은 서비스를 알 수 없습니다"

Error : 

[root@steo lib]# yum makecache

Repository updates is listed more than once in the configuration

http://mirror.dulug.duke.edu/pub/yum-repository/redhat/17/i386/repodata/repomd.xml: [Errno 14] curl#6 - "Could not resolve host: mirror.dulug.duke.edu; 이름 혹은 서비스를 알 수 없습니다"

Trying other mirror.

Solved :

# vi /etc/yum.conf

[main]

cachedir=/var/cache/yum

debuglevel=2

logfile=/var/log/yum.log

pkgpolicy=newest

distroverpkg=redhat-release

tolerant=1

exactarch=1

[fedora]

name=Fedora Core $releasever base

failovermethod=priority

#baseurl=http://dl.google.com/linux/chrome/rpm/stable/i386/

mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=fedora-$releasever&arch=$basearch

enabled=1

metadata_expire=7d

gpgcheck=1

gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-fedora-$basearch

[fedora-debuginfo]

[fedora-debuginfo]

name=Fedora $releasever - $basearch - Debug

failovermethod=priority

#baseurl=http://download.fedoraproject.org/pub/fedora/linux/releases/$releasever/Everything/$basearch/debug/

mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=fedora-debug-$releasever&arch=$basearch

enabled=0

metadata_expire=7d

gpgcheck=1

gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-fedora-$basearch

[fedora-source]

name=Fedora $releasever - Source

failovermethod=priority

#baseurl=http://download.fedoraproject.org/pub/fedora/linux/releases/$releasever/Everything/source/SRPMS/

mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=fedora-source-$releasever&arch=$basearch

enabled=0

metadata_expire=7d

gpgcheck=1

gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-fedora-$basearch

Link : 

https://www.linuxquestions.org/questions/linux-networking-3/cannot-retrieve-metalink-for-repository-fedora-with-yum-after-fedora-15-upgrade-894793/