first of all.I am sorry my English is not good.
I installed two systems : fc6 and xp .
But I wonder why not the Internet fc6 .
I was using the school's network to the server can be connected to external networks through school .
My computer is ip 10.50.1.77
Subnet Mask :255.255.255.0
Gateway :10.50.1.254
DNS:202.99.192.68(211.82.16.10)

This is the data of ping :
[root@eplinux ~]# ping 10.50.1.79
PING 10.50.1.79 (10.50.1.79) 56(84) bytes of data.
64 bytes from 10.50.1.79: icmp_seq=1 ttl=64 time=1.43 ms
64 bytes from 10.50.1.79: icmp_seq=2 ttl=64 time=0.182 ms
64 bytes from 10.50.1.79: icmp_seq=3 ttl=64 time=0.164 ms
64 bytes from 10.50.1.79: icmp_seq=4 ttl=64 time=0.149 ms
--- 10.50.1.79 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3001ms
rtt min/avg/max/mdev = 0.149/0.481/1.432/0.549 ms

This is Gateway :
[root@eplinux ~]# ping 10.50.1.254
PING 10.50.1.254 (10.50.1.254) 56(84) bytes of data.
64 bytes from 10.50.1.254: icmp_seq=1 ttl=255 time=7.72 ms
64 bytes from 10.50.1.254: icmp_seq=2 ttl=255 time=0.637 ms
64 bytes from 10.50.1.254: icmp_seq=3 ttl=255 time=0.645 ms
64 bytes from 10.50.1.254: icmp_seq=4 ttl=255 time=3.51 ms

--- 10.50.1.254 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 2997ms
rtt min/avg/max/mdev = 0.637/3.131/7.724/2.900 ms

This is the home page of the school's network ip
[root@eplinux ~]# ping 211.82.16.68
PING 211.82.16.68 (211.82.16.68) 56(84) bytes of data.
64 bytes from 211.82.16.68: icmp_seq=1 ttl=125 time=0.523 ms
64 bytes from 211.82.16.68: icmp_seq=2 ttl=125 time=1.21 ms
64 bytes from 211.82.16.68: icmp_seq=3 ttl=125 time=3.42 ms
64 bytes from 211.82.16.68: icmp_seq=4 ttl=125 time=0.502 ms
64 bytes from 211.82.16.68: icmp_seq=5 ttl=125 time=0.488 ms

--- 211.82.16.68 ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 3997ms
rtt min/avg/max/mdev = 0.488/1.231/3.429/1.133 ms
Fc6 within the school system,Not visit the home page of the school's network ,Of course, not even on the external network ,Under normal work in xp .
Want guidance !谢谢 Thank you

Are you saying that you cannot visit an intranet site of the school? But you can with XP?

I would check your dns settings. You are using DNS server that are on the Internet. The school may have some internal DNS servers.

Compare the DNS settings in XP and Linux

Are you saying that you cannot visit an intranet site of the school? But you can with XP?
yes!

How DNS installed? (202.99.192.68) China Telecom DNS ,I have Compared the DNS settings in XP and Linux ,I configured system-config-network

If you type in the IP address of the website can you get to it that way?

I can't ,thank you