Thanks Thor and T3RM1NVT0R,

now I am in root account, I can't access the internet
firfox &
[2] 774
ifconfig
eth0 Link encap:Ethernet HWaddr 00:25:64:B2:71:BA
inet addr:129.112.14.31 Bcast:129.112.255.255 Mask:255.255.255.0
inet6 addr: fec0::a:225:64ff:feb2:71ba/64 Scope:Site
inet6 addr: 2002:8170:6a59:a:225:64ff:feb2:71ba/64 Scope:Global
inet6 addr: fe80::225:64ff:feb2:71ba/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:8637801 errors:0 dropped:211 overruns:0 frame:566
TX packets:16611 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1090296806 (1.0 GiB) TX bytes:2322758 (2.2 MiB)
Interrupt:185

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:27168 errors:0 dropped:0 overruns:0 frame:0
TX packets:27168 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:6609752 (6.3 MiB) TX bytes:6609752 (6.3 MiB)

[2]- Done firefox


route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
129.112.14.0 * 255.255.255.0 U 0 0 0 eth0

cat /etc/resolv.conf
search dhcp.swmed.org
nameserver 199.242.236.1
nameserver 199.242.237.1

ls -a /etc/skel
. .. .bash_logout .bash_profile .bashrc .emacs .mozilla
cat /etc/default/useradd
# useradd defaults file
GROUP=100
HOME=/home
INACTIVE=-1
EXPIRE=
SHELL=/bin/bash
SKEL=/etc/skel
CREATE_MAIL_SPOOL=yes

As I can see from this output

Machine IP: 129.112.14.31
Bcast:129.112.255.255
Mask:255.255.255.0

Subnet mask says that your IP has been subnetted as class C IP address then how come broadcast address be 129.112.255.255. If I go as per theory the first 3 octect should not be changed with the subnet of 255.255.255.0.

So basically what I am trying to say is that in that IP range if you are using subnet of 255.255.255.0 then the network address should be 129.112.14.0 and the broadcast address should be 129.112.14.255. So that is first thing that is looking weird to me. Did you make any changes in your ifconfig-eth0 file?

Second thing, I would like to know is the default gateway ip. In earlier posts you said that you think it could be 129.112.14.254. Are we sure on that? Because without default gateway we are not going anywhere.

Is this how your resolv.conf file initially looks like or there are any modifications?

Please do not make any modifications inf any files for now because we will not be knowing then whats going on

initially, the resolv.conf have 4 lines
first line is
;generated by /sbin/dhcient-script
and then
search dhcp.swmed.org
nameserver 199.242.236.1
nameserver 199.242.237.1

there is a note on the computer

network mask:255.255.255.0
gateway: 129.112.14.254

so I think this gateway is right
and when I ping 129.112.14.254
I can get a long result, looks it's OK.

I may changed ifconfig-eth0 file couple of mouth ago.
I think I already change it back to the original one. but I am not sure.

Output of cat /etc/resolv.conf looks OK to me if search dhcp.swmed.org is the name of your domain. If not them comment out this line. From the output of route command I can see that there is no default gateway is defined. If you are sure that is the gateway then run the following command:

But wait, that will not be it if your system's IP configuration itself is not proper. So don't run that command for now. I would like to see the IP configuration of your machine first. Run the following command:

cat /etc/sysconfig/network-scripts/ifcfg-eth0
# Broadcom Corporation NetXtreme BCM5761 Gigabit Ethernet PCIe
DEVICE=eth0
BOOTPROTO=dhcp
HWADDR=00:25:64:B2:71:BA
ONBOOT=yes
TYPE=Ethernet
USERCTL=yes
IPV6INIT=no
PEERDNS=yes

Alright. Output looks good to me. You can run the route add command as I mentioned in my previous post after checking on more thing. Have look at your /etc/sysconfig/network file. If you find anything that says:

Then comment out that line. Run the following command:

And then

Once done check if you are able to connect to internet atleast using root account.

i typed

route add default gw 129.112.14.254

and now the root can access internet again
I am going to check the other accounts

No. Just put a # sign before the line. Like this:

#IPV6_NETWORKING=yes

in the network file,
there is a line
NETWORKING_IPV6=no

now I log on the other account
can access on google only

Leave it as it is. Sorry I mentioned the wrong syntax Back to issue. Are you able to browse all the sites now using root? As you said that you are able to browse google using regular user. If I am getting it correctly we are back to where we were. Right? If yes, could you try the things that I mentioned in my first post in this thread. Here is the abstract:

I would also like to see the output of the following command:

Where, user will be the test user accounts home directory.

(deleted)
Posted irrelevant comment :/

in the test account, can log on google only.

after using "su" command, and then "firefox &", in the new pop-up browser, I can access the other websites.

[root@swan test]# firefox &
[1] 2725
[root@swan test]#
(Gecko:2742): GnomeUI-WARNING **: While connecting to session manager:
Authentication Rejected, reason : None of the authentication protocols specified are supported and host-based authentication failed.

[root@swan test]# ls -a /home/test
. .eggcups .gnome2_private .recently-used.xbel
.. .emacs .gstreamer-0.10 .redhat
.bash_logout .esd_auth .gtkrc-1.2-gnome2 .thumbnails
.bash_profile .gconf .ICEauthority .Trash
.bashrc .gconfd .metacity .xsession-errors
Desktop .gnome .mozilla
.dmrc .gnome2 .nautilus