Ubuntu 11.04 Won't Connect to Internet through Ethernet

[JackYuseiConan]

I'm really new to Ubuntu and stuff. I just installed it on to my Dell Dimension 3100 alongside Windows XP. The Windows XP part of the computer can connect to the internet using the Ethernet cable normally so that's fine. But when I use the Ubuntu bit, it tries to connect to "Auto eth0", fails then just disconnects. I've clicked on "Edit Connections" and under Wired, when I click "Edit" for Auto eth0, the "Device MAC Address" is the exact same as the one get when I type in "ifconfig" or "ifconfig -a" in terminal. As I understand Linux's version of MAC Address is HWaddr right? (Just making sure I'm looking at the right thing). If yes, then I'm sure the correct MAC address is the box... However if no, then please tell me what I *should* be looking at. :\ Also, the Cloned MAC Address is empty, not *too* sure what a Cloned MAC Address is but I've just left it empty. MTU is on automatic. I haven't touched any other settings (802.1x Security/IPv4/IPv6), I assume I don't need to touch those? And before anyone asks, the Dell Dimension 3100 can't connect wirelessly unless you buy a PCI card or something... I think. So nothing is under Wireless. And ditto for Mobile Broadband, VPN and DSL.

Please help.

Thanks JYC

[JackYuseiConan]

Oh and I've also installed Ubuntu 11.04 on a laptop and it can connect wirelessly to the internet fine. So it's definitely not Ubuntu and probably just me being me. I'm not the sharpest tool in the box when it comes to this sort of stuff unfortunately. :\

[JackYuseiConan]

And *another* thing... Sorry to be such a pain.

I read another post and a guy suggested to type "sudo mii-tool eth0" and it came up with "eth0: negotiated 100baseTx-FD flow-control, link ok"

Thanks JYC

[chili555]

Let's have a look at what you have. Please open a terminal and run and post:

lspci -nn | grep -e 0200 -e 0280
sudo lshw -C network

The latter command will take a few moments; please be patient.

You can copy and paste from the terminal to a text editor and transfer it with a USB key or similar to post it here.

[JackYuseiConan]

For

lspci -nn | grep -e 0200 -e 0280

it says:

03:08.0 Ethernet controller [0200]: Intel Corporation 82562ET/EZ/GT/GZ - PRO/100 VE (LOM) Ethernet Controller [8086:1064] (rev 04)

And for

sudo lshw -C network

it says:

*-network
description: Ethernet interface
product: 82562ET/EZ/GT/GZ - PRO/100 VE (LOM) Ethernet Controller
vendor: Intel Corporation
physical id: 8
bus info: pci@0000:03:08.0
logical name: eth0
version: 04
serial: 00:13:20:e1:52:ab
size: 100Mbit/s
capacity: 100Mbit/s
width: 32 bits
clock: 33MHz
capabilities: pm bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=e100 driverversion=3.5.24-k2-NAPI duplex=full firmware=N/A latency=64 link=yes maxlatency=56 mingnt=8 multicast=yes port=MII speed=100Mbit/s
resources: irq:20 memory:dfcff000-dfcfffff ioport:d8c0(size=64)

[chili555]

So far, so good. You have a driver and an interface, e100 and eth0 respectively. You should not have to fill in anything at all in Network Manager > Edit Connections. The system should figure out all the details for you. If you have added some settings, remove them and press Save.

Let's see what the system logs have to say. Plug in the ethernet cable, click the Network Manager icon and click on Auto eth0. Please see attached. Does it try to connect and fail? Let's see what is happening. Please run and post:

sudo cat /var/log/syslog | grep -e etwork -e e100 | tail -n20

Thanks.

[JackYuseiConan]

I haven't edited anything.

And when I click on Auto Eth0, it tries to connect for about 30 seconds aprox. and then comes up with the message:
"Wired network

Disconnected - you are now offline"

Here's the log:

Jul 12 15:44:18 JYC-PC NetworkManager[452]: <info> (eth0): device state change: 4 -> 5 (reason 0)
Jul 12 15:44:18 JYC-PC NetworkManager[452]: <info> Activation (eth0) Stage 2 of 5 (Device Configure) successful.
Jul 12 15:44:18 JYC-PC NetworkManager[452]: <info> Activation (eth0) Stage 3 of 5 (IP Configure Start) scheduled.
Jul 12 15:44:18 JYC-PC NetworkManager[452]: <info> Activation (eth0) Stage 2 of 5 (Device Configure) complete.
Jul 12 15:44:18 JYC-PC NetworkManager[452]: <info> Activation (eth0) Stage 3 of 5 (IP Configure Start) started...
Jul 12 15:44:18 JYC-PC NetworkManager[452]: <info> (eth0): device state change: 5 -> 7 (reason 0)
Jul 12 15:44:18 JYC-PC NetworkManager[452]: <info> Activation (eth0) Beginning DHCPv4 transaction (timeout in 45 seconds)
Jul 12 15:44:18 JYC-PC NetworkManager[452]: <info> dhclient started with pid 1734
Jul 12 15:44:18 JYC-PC NetworkManager[452]: <info> Activation (eth0) Stage 3 of 5 (IP Configure Start) complete.
Jul 12 15:44:18 JYC-PC NetworkManager[452]: <info> (eth0): DHCPv4 state changed nbi -> preinit
Jul 12 15:45:03 JYC-PC NetworkManager[452]: <warn> (eth0): DHCPv4 request timed out.
Jul 12 15:45:04 JYC-PC NetworkManager[452]: <info> (eth0): canceled DHCP transaction, DHCP client pid 1734
Jul 12 15:45:04 JYC-PC NetworkManager[452]: <info> Activation (eth0) Stage 4 of 5 (IP4 Configure Timeout) scheduled...
Jul 12 15:45:04 JYC-PC NetworkManager[452]: <info> Activation (eth0) Stage 4 of 5 (IP4 Configure Timeout) started...
Jul 12 15:45:04 JYC-PC NetworkManager[452]: <info> (eth0): device state change: 7 -> 9 (reason 5)
Jul 12 15:45:04 JYC-PC NetworkManager[452]: <info> Marking connection 'Auto eth0' invalid.
Jul 12 15:45:04 JYC-PC NetworkManager[452]: <warn> Activation (eth0) failed.
Jul 12 15:45:04 JYC-PC NetworkManager[452]: <info> Activation (eth0) Stage 4 of 5 (IP4 Configure Timeout) complete.
Jul 12 15:45:04 JYC-PC NetworkManager[452]: <info> (eth0): device state change: 9 -> 3 (reason 0)
Jul 12 15:45:04 JYC-PC NetworkManager[452]: <info> (eth0): deactivating device (reason: 0).

[JackYuseiConan]

Oh and btw, I tried running Ubuntu on the USB stick I used to instal it and it still doesn't connect, never did. It didn't the first time and it doesn't now.

[chili555]

I wonder if there any kernel messages about the driver:

dmesg | grep e100

Thanks.

[JackYuseiConan]

[ 0.803161] pci 0000:03:08.0: Firmware left e100 interrupts enabled; disabling
[ 1.991421] e100: Intel(R) PRO/100 Network Driver, 3.5.24-k2-NAPI
[ 1.991428] e100: Copyright(c) 1999-2006 Intel Corporation
[ 1.991497] e100 0000:03:08.0: PCI INT A -> GSI 20 (level, low) -> IRQ 20
[ 2.028044] e100 0000:03:08.0: PME# disabled
[ 2.029344] e100 0000:03:08.0: eth0: addr 0xdfcff000, irq 20, MAC addr 00:13:20:e1:52:ab
[ 13.380161] e100 0000:03:08.0: eth0: NIC Link is Up 100 Mbps Full Duplex

With every "e100" in red. Not sure if that means anything but just thought I should mention it.