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Well thanks you both first of all that you could find to answer me...
Well in my office we have a firewall PC on which we have DSL conenction and that is our default gateway 192.168.1.1, we already have a linux machine but it is very old so we decided to make a new faster PC for linux. so i installed fc4 on a new PC, and setup smb, dovcort, httpd, etc, and everything is working and hopefully we will be shifting our work to this new PC soon. but the problem is i can not access net on this PC dont know why.... but because of that i can update my yum repository. i have to install some external php libraries but whenever i try yum install... it stops.
hmmm... the exact details would be useful. I also recommend printing the output from
ifconfig (-a for all I think? can't check right away...)
and perhaps also a ping of whatever dns you're using. It sounds like something isn't properly configured, which could possibly also be a proxy.
If those work then your Only problem is your DNS server settings.
You can try entering the IP address of your Broadband router as linmix suggested
Check what the DNS settings on your Windows machine are
START -> RUN -> cmd -> <OK> ipconfig /all
Or You can directly enter the IP Addressess of your ISP's DNS Servers..