Installed CentOS - no internet or network

[webxchris]

This is my first Linux install, though I have been maintaining CentOS servers remotely for years. I built a system to serve as a backup/testing server at home. I installed CentOS 6. The internet wasn't working after install so I researched drivers and found several people saying I needed nVidia's nForce Drivers (forcedeth). My ethernet card is the Realtek RTL8201CL.

I installed the nVidia drivers according to its readme, but that did not allow me to connect to the internet. I have been working on this for about 8 hours and have been unable to solve it myself, so I am asking for any suggestions.

When I try to ping an ip address on my network it says "connect: Network is unreachable". The machine doesn't appear on my d-link router's status page showing all my other machines.

I would paste in a lot of stuff in case it would be helpfull, but since the machine has no internet that is going to be difficult.

Again, I would greatly appreciate any suggestions! This is my first install so I may be missing something totally obvious.

Thanks!


Edit:
After some further research, I learned that entering the following lines actually lets me ping other computers in my network and my CentOS machine now shows up in my dlink router status page. However, I still can't seem to connect to any websites or do any yum commands. And the settings don't stick after I reboot. I have to re-enter them each time I start the machine.
ifconfig eth0 192.168.0.188 netmask 255.255.255.0 up
route add default gw 192.168.0.1

[jayd512]

Hello and Welcome!

Sound like you been really going at it.
Open up a terminal, use the following commands.

lspci -vnn
lsmod
ifconfig -a

If you need to, copy the output to a USB drive, and copy them to another computer to post them.

[HROAdmin26]

RHEL6 does not configure the NIC by default and is configured to use Network Manager by default (launched from a desktop GUI.)

Google: how to configure network rhel 6

[webxchris]

lspci returns a "command not found".

I had to burn a DVD to get the ethernet drivers to the box since I spent about 2 hours trying to mount a usb drive without success. One problem I run into is almost everything I google on "how to do X" I get command not found. For example, googling how to find connected devices or USB devices brings back tons of ways, but none that I have been able to do. I probably need the pcutil but all the guides I find on installing that use yum so I need internet.

Here are a few lines from lsmod I typed up manually. If there is anything you are looking for that could be helpfull please let me know and I will type it up.

iptable_filter   2147   1
ip_tables     9541    1   iptable_filter
ip6t_REJECT     3961   2
nf_conntrack_ipv6    16198   2
ip6table_filter   2219   1
ip6_tables   10809   1   ip6table_filter
ipv6    264702   24   ip6t_REJECT,nf_conntrack_ipv6
forcedeth    48555    0
snd_hda_codec_realtek   212785    1
snd_hda_codec    70277     2    snd_hda_codec_realtek,snd_hda_intel
snd    52722    8    snd_hda_codec_realtek,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_seq,snd_seq_device,snd_pcm,snd_timer

and here is ifconfig -a (typed up manually lol)

eth0     Link encap:Ethernet  HWaddr 00:30:67:AE:70:9E
           inet addr:192.168.0.188  Bcast:192.168.0.255  Mask:255.255.255.0
           inet6 addr: fe80::230:67ff:feae:709e/64 Scope:Link
           UP BROADCAST RUNNING MULTICAST   MTU:1500  Metric:1
           RX packets:2105 errors:0 dropped:0 overruns:0 frame:0
           TX packets:41 errors:0 dropped:0 overruns:0 carrier:0
           collisisions:0 txqueuelen:1000
           RX bytes:258145 (252.0 KiB)   TX bytes:3658 (3.5 KiB)
           Interrupt:27 Base address:0x8000

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:24 errors:0 dropped:0 overruns:0 frame:0
           TX packets:24 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:0
           RX bytes:1976 (1.9 KiB)  TX bytes:1976 (1.9 KiB)

[webxchris]

RHEL6 does not configure the NIC by default and is configured to use Network Manager by default (launched from a desktop GUI.)

Google: how to configure network rhel 6

Thanks, I will do some research into that. Unfortunately CentOS 6 does not come with any sort of GUI. While trying to fix this problem I kept seeing how to use "system-config-network" but that is also not included with CentOS 6.

Edit: Wow that link you gave solved my problem so simply, just edited that one file and everything works now. Don't know how I couldn't find that info in all my searching. Thanks for your help!