On Wed, 8 Apr 2009, fred smith wrote:

  

Downloading Packages:
(1/1): kernel-2.6.18-128. 100% |=========================|  15 MB    05:41
http://centos.mirror.nac.net/5.3/updates/i386/RPMS/kernel-2.6.18-128.1.6.el5.i686.rpm: [Errno -1] Package does not match intended download
Trying other mirror.
        

http://mirror-status.centos.org/ is listing http://centos.mirror.nac.net/
as 2 days late, so you might have been hitting an incomplete mirror.
      

Wouldn't surprise me. But I've tried this probably 10 times in the last
2-3 hours, would I always be that unlucky?

And if so, how would I avoid that mirror?
    

This issue was just raised in the main IRC channel as well. 
By temporarily adding a line to /etc/hosts on the machine 
seeking to pull updates, of the follow form, it will fail on 
over to the next suggested entry:

127.0.0.2	centos.mirror.nac.net

Remember to pull it out again in a few days.

-- Russ herrold