When yum is unable to access the server indicated by an DNS A record, it then silently fails over to trying the DNS AAAA record. If it is unable to access the yum server indicated by the AAAA record, yum displays an error message like:<br />
<br />
# yum update<br />
Could not retrieve mirrorlist <a href="http://mirrorlist.centos.org/?release=6&arch=x86_64&repo=os">http://mirrorlist.centos.org/?release=6&arch=x86_64&repo=os</a> [<a href="http://mirrorlist.centos.org/?release=6&arch=x86_64&repo=os" target="_blank">^</a>] error was<br />
14: PYCURL ERROR 7 - "Failed to connect to 2a02:2498:1:3d:5054:ff:fed3:e91a: Network is unreachable"<br />
Error: Cannot find a valid baseurl for repo: base<br />
<br />
This error leads the user to believe that there is a problem with IPV6. When the actual problem is that yum cannot access the configured repository. This blog has also made this observation -> <a href="http://www.iotti.biz/?p=433">http://www.iotti.biz/?p=433</a> [<a href="http://www.iotti.biz/?p=433" target="_blank">^</a>]
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