Dear Harry

After finishing hard time to set up RedHat on my laptop, I face a problem again.
Because I thought RedHat will fix the problem. Unfortunately, it didn't.
Now I connected my laptop to my laboratory network. We configure IP addresses
manually. Here I post the output after "ifconfig". Please be noted, i made some
mild changes to addresses for privacy as you suggested.

[root@localhost ~]# ifconfig
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:6020 errors:0 dropped:0 overruns:0 frame:0
TX packets:6020 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:9154718 (8.7 MiB) TX bytes:9154718 (8.7 MiB)

[root@localhost ~]# ifconfig
eth0 Link encap:Ethernet HWaddr 00:400:78:26:1D
inet addr:133.2.25.220 Bcast:133.2.25.255 Mask:255.255.255.0
inet6 addr: ae80::240:c0ff:fe75:411e/64 Scope:Link
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:2 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 b) TX bytes:168 (168.0 b)
Interrupt:5 Base address:0x6300

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:6025 errors:0 dropped:0 overruns:0 frame:0
TX packets:6025 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:9155165 (8.7 MiB) TX bytes:9155165 (8.7 MiB)

As you mention, there seems no problem at all. But I still can't connect internet.
I can't ping to any address. For example www.google.com (66.102.7.147)
After a while the response is :
From 133.2.25.220 icmp_seq=1 Destination Host Unreachable
From 133.2.25.220 icmp_seq=2 Destination Host Unreachable
From 133.2.25.220 icmp_seq=3 Destination Host Unreachable
From 133.2.25.220 icmp_seq=4 Destination Host Unreachable
From 133.2.25.220 icmp_seq=5 Destination Host Unreachable
From 133.2.25.220 icmp_seq=6 Destination Host Unreachable

And when I enter address in Mozilla browser. It says Looking up www.yahoo.com.
No response.

Please help me how to solve this problem.

Sorry for any inconvinence

Bataa