[karmic] eth0 not working how to configure two ethernet nic cards

Thank you for taking the time to report this issue and helping to make Ubuntu better. Examining the information you have given us, this does not appear to be a bug report so we are closing it and converting it to a question in the support tracker. We appreciate the difficulties you are facing, but it would make more sense to raise problems you are having in the support tracker at https://answers.launchpad.net/ubuntu if you are uncertain if they are bugs. For help on reporting bugs, see https://help.ubuntu.com/community/ReportingBugs#When%20not%20to%20file%20a%20bug.

To help you better we need some infos about your hardware so please open a Terminal from the menu:
Applications → Accessories → Terminal and type or copy and paste the rows below, please copy and paste a row a time then press enter:

lsb_release -sd
lspci
ifconfig -a

lspci is lower of LSPCI

copy and paste result here.

Thank you

mac@mac-laptop:~$ lsb_release -sd
Ubuntu karmic (development branch)

mac@mac-laptop:~$ lspci
00:00.0 Host bridge: Intel Corporation Mobile 945GME Express Memory Controller Hub (rev 03)
00:02.0 VGA compatible controller: Intel Corporation Mobile 945GME Express Integrated Graphics Controller (rev 03)
00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/GME, 943/940GML Express Integrated Graphics Controller (rev 03)
00:1b.0 Audio device: Intel Corporation 82801G (ICH7 Family) High Definition Audio Controller (rev 02)
00:1c.0 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 1 (rev 02)
00:1c.1 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 2 (rev 02)
00:1d.0 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #1 (rev 02)
00:1d.1 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #2 (rev 02)
00:1d.2 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #3 (rev 02)
00:1d.3 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #4 (rev 02)
00:1d.7 USB Controller: Intel Corporation 82801G (ICH7 Family) USB2 EHCI Controller (rev 02)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev e2)
00:1f.0 ISA bridge: Intel Corporation 82801GBM (ICH7-M) LPC Interface Bridge (rev 02)
00:1f.2 IDE interface: Intel Corporation 82801GBM/GHM (ICH7 Family) SATA IDE Controller (rev 02)
01:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8101E/RTL8102E PCI Express Fast Ethernet controller (rev 02)
02:00.0 Network controller: RaLink RT2860

mac@mac-laptop:~$ ifconfig -a
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:19 errors:0 dropped:0 overruns:0 frame:0
          TX packets:19 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:2357 (2.3 KB) TX bytes:2357 (2.3 KB)

ppp0 Link encap:Point-to-Point Protocol
          inet addr:188.33.57.168 P-t-P:10.64.64.64 Mask:255.255.255.255
          UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1500 Metric:1
          RX packets:27875 errors:9 dropped:0 overruns:0 frame:0
          TX packets:27257 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:3
          RX bytes:25397429 (25.3 MB) TX bytes:3665186 (3.6 MB)

ra0 Link encap:Ethernet HWaddr 00:1d:92:ca:e0:bd
          inet6 addr: fe80::21d:92ff:feca:e0bd/64 Scope:Link
          UP BROADCAST MULTICAST MTU:1500 Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
          Interrupt:17

I don't know if this is only my experience, or just a problem, but since one upgrade about month ago it just dissapear along with USB mounting. USB mounting has been resolved some time ago. This problem remains.

There's a little misunderstanding here. The title has changed becouse I guess somebody thought that I have 2 ethernet cards. Thant's not true. My eth0 dissapear and I had to have an internet so I decided to plug in my usb modem huawei to have internet. This doesn't helped neither changed enything. The issue is the same with and without the huawei modem. My bad for posting command ifconfig -a with the modem, so I present here without the modem:

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:143 errors:0 dropped:0 overruns:0 frame:0
          TX packets:143 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:8872 (8.8 KB) TX bytes:8872 (8.8 KB)

ra0 Link encap:Ethernet HWaddr 00:1d:92:ca:e0:bd
          inet6 addr: fe80::21d:92ff:feca:e0bd/64 Scope:Link
          UP BROADCAST MULTICAST MTU:1500 Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
          Interrupt:17

And someone please change the topic back to the way it was before.
Thanks, and sorry if I didn't clarify enough.

oh, and ra0 is my wifi card

Can anybody please help me??
Or is it just a dead end?? Please instruct me what to do next. Until now the problem is still very hard for me.
Best Regards.