I have recently reinstalled OpenSuSe on my computer to practice customizing partitions. After doing so I have been unable to connect to the internet. In fact when I use the ifconfig command eth0 doesn't show up anymore only lo. I have another box connected to the router and it works. Can anyone help me figure out why my Linux box is having issues? The output from the ifconfig command is:

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:158 errors:0 dropped:0 overruns:0 frame:0
TX packets:158 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:12148 (11.8 kb) TX bytes:12148 (11.8 kb)

I would check out the network settings under Yast2. http://opensuse.swerdna.org/susenic.html

Make sure your card is recognized, if not, you have a driver issue.

To back up what pljvaldez said:
This problem has nothing to do with that router. Your Linux install is not seeing any network interface. You need to resolve that before anything will get so far as the router. (And once you do, it may all 'just work' as intended!)

I went through the tutorial(except the wireless section, because it's wired)and I pretty much had everything exactly like they instructed. Except I had the "Change Hostname via DHCP" box checked under the Hostname/DNS tab. Under the Overview tab as name I had "Ethernet Network Card DHCP" and as the info:

Ethernet Network Card (No hwinfo)
Device Name: eth0
Started automatically at boot
IP address assigned using DHCP

I still get the same output with ifconfig, so am I missing a driver or...?

I think you must be missing a driver. Can you post the output of lspci and lsmod?

Try "/sbin/ifconfig -a" to see if eth0 is listed.

The lsmod output is attached and the lspci:
Host bridge: VIA Technologies, Inc. VT8753 {P4X266 AGP} (rev 01)
PCI bridge: VIA Technologies, Inc. VT8733
USB Controller: VIA Technologies, Inc. VT82xxxxx
USB Controller: VIA Technologies, Inc. VT82xxxxx
USB Controller: VIA Technologies, Inc. VT82xxxxx
USB Controller: VIA Technologies, Inc. USB 2.0 (rev 82)
ISA bridge: VIA Technologies, Inc. VT8235 ISA Bridge
IDE interface: VIA Technologies, Inc. VT82C586A/B/VT82C686/A/B/VT823x/A/C PIPC Bus Master IDE (rev 06)
Multimedia audio controller: VIA Technologies, Inc.VT8233/A/8235/8237 AC97 Audio COntroller (rev 50)
VGA compatible controlelr: nVidia Corporation NV18 [FeForce4 MX 4000] (rev c1)

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Unless I am missing something, it almost looks as if there is no Ethernet interface device detected. Period.
Try a live CD: if that also does not detect it try tearing down the machine a bit, cleaning the card contacts, and re-seating the cards and securing them as you re-assemble.
( With power disconnected, grounded, and following the usual safe practices, natch.)

I agree that the OS doesn't seem to be recognizing your card. What kind of hardware is this (either the card info if a separate card or the motherboard info if it's built in)?

Thanks to everyone for the help, after I broke the box down, cleaned and reconnected everything it worked