Repositories- IP and just how do they work

[happz]

I am behind a firewall at work and running CENTOS5.4. I wanted to update php from 5.xx to 5.2 and found that I am unable to get what i need to complete the task because of what i believe is our firewall at work. I get ..."Trying other mirror...."and "urlopen error timed out"....

I contacted corp and they would be willing to let me hit certain IP from the IP of my centos ispconfig servers. My problem is that I can't give the IP because when i yum install xxxxxxx, it tries so many site (and mirrors) that I can't possibly research all IP. What am I doing wrong or what can someone teach me to help me behind the firewall....?

hAppz