View Full Version : [ubuntu] No network connection

November 23rd, 2010, 02:00 PM
The problem I have is when I install 10.10 I get no wired connection my wifi works great, just no wired connection. I dont have wifi where I am right now. It works fine when I run off the dvd , but when I install it i get nothing. I have tried static ip, reinstalling, reinstalling drivers. Don't know what else to do. If anyone has any ideas on how to solve this problem I would be thankful.

I have a Dell Inspiron 1720
the ethernet is a broadcom 440x

November 23rd, 2010, 02:31 PM
Will you please post the content of sudo /sbin/ifconfig

November 23rd, 2010, 02:59 PM
eth1 Link encap:Ethernet HWaddr 00:1e:4c:c1:cd:47
inet6 addr: fe80::21e:4cff:fec1:cd47/64 Scope:Link
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 Base address:0xc000

lo Link encap:Local Loopback
inet addr: Mask:
inet6 addr: ::1/128 Scope:Host
RX packets:1008 errors:0 dropped:0 overruns:0 frame:0
TX packets:1008 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:78768 (78.7 KB) TX bytes:78768 (78.7 KB)

November 23rd, 2010, 03:23 PM
Will you please post the content of sudo /sbin/iwconfig
and sudo lshw -C Network

November 23rd, 2010, 06:39 PM
eth1 IEEE 802.11bg ESSID:""
Mode:Managed Frequency:2.412 GHz Access Point: Not-Associated
Bit Rate:54 Mb/s Tx-Power:24 dBm
Retry min limit:7 RTS thr:ff Fragment thr:ff
Encryption key:ff
Power Management:ff
Link Quality=5/5 Signal level=0 dBm Noise level=-97 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0

November 23rd, 2010, 09:56 PM
Will you please post the content of /etc/network/interfaces

Your wireless card is called eth1 and there should be and eth0 for your ethernet. Do you run VMware? Will you please post sudo lshw -C network

November 24th, 2010, 12:55 AM
description: Wireless interface
product: BCM4312 802.11b/g LP-PHY
vendor: Broadcom Corporation
physical id: 0
bus info: pci@0000:0c:00.0
logical name: eth1
version: 01
serial: 00:1e:4c:c1:cd:47
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=wl0 driverversion= ip= latency=0 multicast=yes wireless=IEEE 802.11bg
resources: irq:17 memory:fe8fc000-fe8fffff
*-network UNCLAIMED
description: Ethernet controller
product: BCM4401-B0 100Base-TX
vendor: Broadcom Corporation
physical id: 0
bus info: pci@0000:03:00.0
version: 02
width: 32 bits
clock: 33MHz
capabilities: pm bus_master cap_list
configuration: latency=64
resources: memory:fe5fe000-fe5f

No I dont use VMware. permission denied when I put this in /etc/network/interfaces.

November 24th, 2010, 03:56 PM
Your Ethernet card have not got a logical name such as eth0. Please post the content of dmesg | grep net

You should not put anything in /etc/network/interfaces but only post the content of the file.

November 24th, 2010, 04:17 PM
/etc/network/interfaces is auto lo
iface lo inet loopback

dmesg | grep net is
Usage: dmesg [-c] [-n level] [-r] [-s bufsize]

November 24th, 2010, 04:18 PM
Is it 10.10 (64 bit) you have installed? Which kernel do you use?
uname -r

November 24th, 2010, 04:27 PM
It's 32 bit 2.6.35-22- generic

November 24th, 2010, 05:30 PM
Ok you are probably missing a line for eth0 in


Here is the content of mine. I have 3 cards. eth0,eth1 and eth2.
You must add the line containing eth0 and put in yours PCI device code and ATTR{address} which is the MAC address (found when you boot into windows and edit network somewhere)

# PCI device 0x10de:0x0066 (forcedeth)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:11:2f:49:96:6b", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"

# PCI device 0x10ec:0x8139 (8139too)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:10:a7:10:65:d6", ATTR{type}=="1", KERNEL=="eth*", NAME="eth1"

# PCI device 0x14b9:0x4800 (airo)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:40:96:28:a4:f3", ATTR{type}=="1", KERNEL=="eth*", NAME="eth2"

You can log in as su in ubuntu to edit the file or
sudo nano /etc/udev/rule.d/70-persistent-net.rules

After you've done the changes save the file (Ctrl-o) and reboot.
Check now with sudo /sbin/ifconfig if you have eth0.

If you don't find the PCI device code numers try lspci -nn before you edit the file.

November 24th, 2010, 05:45 PM
If you don't have windows partition you can boot from your live CD and try to locate the file and copy it to the directory I mentioned.

November 24th, 2010, 05:55 PM
I found the file and Here's what my file /etc/udev/rules.d/70-persistent-net.rules reads.

#PCI device 0x14e4:0x170c (b44)
SUBSYSTEM=="net", ACTION=="add', Drivers=="?", ATTR{address}=="00:1d:09:c7:a4:3f", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"

#PCI device 0x14e4:0x4315 ()
SUBSYSTEM=="net", ACTION=="add', Drivers=="?", ATTR{address}=="00:1e:4c:c1:cd:47", ATTR{dev_id}=="0x0", KERNEL=="eth*", NAME="eth1"

Haven't done anything yet

November 24th, 2010, 06:40 PM
Ok. I looks ok to me. Nothing to edit. Then I don't know what to do.

November 24th, 2010, 06:43 PM
Looks ok to me. Nothing to edit.

November 24th, 2010, 06:57 PM
Sorry to interrupt, but when you were enabling the STA driver for the wireless card, did you follow some set of instructions that may have said to "blacklist b43, b44 and ssb"?

The ethernet controller you are using requires b44 and ssb.

November 24th, 2010, 07:34 PM
When I activated the sta driver it didnt say anything about a blacklist..How to I check to see if it put the b43 and b44 on the blacklist?

November 24th, 2010, 09:34 PM
When I activated the sta driver it didnt say anything about a blacklist..How to I check to see if it put the b43 and b44 on the blacklist?

No this would have been something you did.

November 24th, 2010, 09:53 PM
OK I just reinstalled 10.10 and have not done nothing and still it doesnt auto detect my ehternet only driver option it gives me is the sta wireless driver..

November 24th, 2010, 11:00 PM
The drivers for the ethernet device ( this system has the same chipset) do not require the user to download anything. If you go to Applications>>Accessories>>Terminal (this is the terminal) and enter in


that is LSMOD in lowercase, do you see the modules listed for b44 and ssb?
The reason being that when you did the driver install for STA you must have been connected to the internet through ethernet to get them. At least that is the easiest way!

If you don't see them you might copy/paste the output back here.