General :: Missing Eth0 Ethernet Interface In Ubuntu — Can't Connect To Router

Aug 27, 2011

I'm having trouble getting my Ubuntu 10.04 machine (Sony Vaio VGN-SR490) to connect to the Internet by way of an Ethernet cable connected directly to my router.

I'm able to connect to the Internet using this same cable using a Windows machine, so there's something wrong with the way Linux is configured.

How do I got about figuring out what the problem is and solving it?

Here are my network settings on Linux:

$ ifconfig
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host

[Code].....

It looks like the network adapters list is empty. I will now install both Windows XP and Ubuntu Linux dual-boot. I'm still not able to access the internet, even through Windows. I'm wonder if this could be a hardware problem with the computer or a problem with the router itself. Other computers can connect to this same router, and work fine. (That's how I'm posting this after all!)

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General :: Stop And Restart Ethernet Connection Ubuntu 9.10 - Ignoring Unknown Interface Eth0=eth0

Mar 8, 2010

If I uncheck and recheck "Enable Networking" in the Network Manager Applet 0.7.996 I would expect the wired network to disconnect (which it does) and reconnect (which it does NOT). So I tried sudo ifdown eth0 and got

Quote:

Ignoring unknown interface eth0=eth0.

ifconfig tells me

Quote:

eth0 Link encap:Ethernet HWaddr 00:25:64:e8:18:2c
inet addr:192.168.0.112 Bcast:192.168.0.255 Mask:255.255.255.0
inet6 addr: fe80::225:64ff:fee8:182c/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

[code]....

so I am at a loss. How do I stop and restart the network interface short of rebooting the machine?

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General :: Ethernet Interface Not Found - Eth0

Jul 19, 2011

I booted an OS from a live CD. The OS boots successfully but eth0 fails to start. I checked lspci, it outputs these Ethernet card details:

(Broadcom Netextreme II BCM5716 GBabyte ethernet)

ifconfig -a returns only the loopback interfaces lo and sit0. The output of dmesg | grep -I 'eth' is:

"Netfront : initializing network ethernet driver"

When I run service network restart I get:

"Obtaining IP for lo [FAILED]
WARNING: Deprecated config gile /etc/modprobe.conf , all config files belong into /etc/modprobe.d/
Device eth0 does not seem to be present, delaying initialization [FAILED]"

The output of MII-tool -v is:

No MII interface found.

I was also able to find the kernel module bnx2.ko. I did insmod and lsmod lists it.

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Ubuntu Networking :: Eth0 Interface Went Missing

Mar 16, 2011

I have already tried reloading the drivers, restarting the interface (which is missing) and every other solution I found on this forum (well... not exactly all of them but many of them) uname -a gives Linux hostname 2.6.35-27-generic #48-Ubuntu SMP Tue Feb 22 20:25:46 UTC 2011 x86_64 GNU/Linux

[Code]....

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Ubuntu Networking :: PC Router Between Wireless And Ethernet Interface

Sep 2, 2010

I tried to setup a connection as below but face some problem (probably route table setting incorrect). Hope if anyone could shed the light.Basically, I have a PC1 (.1) and PC2 (.130) connected via a PC router. PC router has 2 interfaces: wireless (.2) and ethernet (.129). PC1 connects to PC router via LAN cable/wireless interface, while PC2 connects to PC router via cable. This settings try to simulate 1 wireless connection along the path (and because PC2 is too old to support wireless interface, we need a PC router). These interfaces are all under same 172.16.130.x subnet.

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Networking :: Getting A VLAN Router With A Wan Interface Capable Of Ethernet And AMT?

Oct 30, 2010

getting a VLAN router with a wan interface capable of Ethernet and AMT? something under $80-$100 pref.i need to segment a client on my home network.

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Applications :: Using 2 PPPOE Accounts Same ISP Connect Through Same Interface Eth0

Nov 6, 2010

I'm using CENTOS 5.5 and I want to connect to internet using 2 pppoe accounts same ISP and i have a sigle NIC eth0.I used adsl-setup to create pppoe connections, 1 is ppp0 and second is ppp1. When i use /sbin/ifup ppp0 it works, i can use the internet, but when i try to use /sbin/ifup ppp1 while ppp0 is connected, nothing happens, i did ifconfig and there is only ppp0 showing.I'm a BIG NEWBIE of linux, i need to know step by step how to make this work, i heard something about a virtual network... but nothing clear.

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CentOS 5 :: Using 2 PPPOE Accounts Same ISP Connect Through Same Interface Eth0?

Nov 6, 2010

I'm using CENTOS 5.5 and I want to connect to internet using 2 pppoe accounts same ISP and i have a sigle NIC eth0.I used adsl-setup to create pppoe connections, 1 is ppp0 and second is ppp1. When i use /sbin/ifup ppp0 it works, i can use the internet, but when i try to use /sbin/ifup ppp1 while ppp0 is connected, nothing happens, i did ifconfig and there is only ppp0 showing.I'm a BIG NEWBIE of linux, i need to know step by step how to make this work, i heard something about a virtual network... but nothing clear.

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Networking :: No IPv4 On Eth0 - No Connect To Router

Apr 20, 2010

I have tried clean installs of Knoppix v0.6, Xandros 2.0, and Ubuntu 7.1... same issue with all. I cannot seem to get eth0 (via chip on mobo) to get/have/use IPv4. ifconfig shows only IPv6. (I cannot paste any info because linux desktop is on different box.)

End result is that I cannot get the linux desktop to connect to my lan, either with dhcp or with static ip.

I have a belkin router configured as my gateway 192.168.3.1 and nothing fancy with the setup. I have dhcp open for 192.168.3.245 thru ...254 and at most there are only 4 systems in home connecting with dhcp at any time. all other systems have static addresses.

I have two decades of desktop and lan support under my belt, but relatively small amount of command line experience and almost no history with linux (unless you count a dozen unsuccessful attempts to burn linux distro install discs on this Vista desktop).

Therein lies the start of my prob. I need to build and manage a fileserver for my home, but cannot seem to get a working installer cd or dvd to burn from anything I download.

So I said to myself, "Self," I said, "you're a tech. Build a workstaion, use the DVD that came with your Linux Bible (2008 Ed.) to install one of the linux distros on it, then download a recent, stable server distro and burn it using the linux workstation."

Unfortunately, if I cant get an ipv4 connection to my home network, I cant get out to the Internet to download any newer ISO files.

So what am I missing or doing wrong? How do I tell linux to stop trying to use IPv6 and let me use IPv4?

BTW, eth0 works just fine if I install Windows on that PC, so I know its not bad HW. Could it be a driver issue? Or do I need to use some Terminal command to turn off IPv6 and reconfigure eth0 for IPv4?

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Networking :: Multiple Ethernet - LAN - Cant Connect To Both The Eth0 And Eth1 At The Same Time

Dec 12, 2010

I have 2 LAN ports. one from the motherboard (on board) and the other from a lan card i bought a few days back. one is use for browsing the net, the other for a media player.

problem is i cant connect to both the eth0 and eth1 at the same time. i have to disconnect one of them to connect to the other. and this really gets irritating as it doesnt always work as flawlessly as it should. what am i doing wrong?

Output of "ifconfig":

Quote:

I'm on ubuntu desktop 10.10 64 bit.

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Ubuntu Networking :: Wired Ethernet Connection - Unable To Connect To The Internet Or My Router

Dec 5, 2010

I have just installed ubuntu 10.04 using the wubi installer to dual-boot my machine. Under ubuntu, I am not able to connect to the internet or my router. Everything works fine under windows. I have tried to find relevant information in the forums, but nothing seems to work for me. I have tried disabling ipv6, setting a static ip, but no go. ifconfig shows no IP, dhclient results in no DHCP offers and pinging my router's IP results in Network is Unreachable.

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Ubuntu :: Eth0 Doesn't Exists For Firestarter - Eth0: Error Fetching Interface Information: Device Not Found

May 5, 2010

My network name is eth2 it was changed by some reason and now i got these errors... i installed, reinstalled, re re installed, tried to run the asistant but no luck :/

Code:

* Stopping the Firestarter firewall...
eth0: error fetching interface information: Device not found
eth0: error fetching interface information: Device not found
eth0: error fetching interface information: Device not found

[code]....

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Networking :: Ignoring The Unknown Interface Eth0=eth0?

Dec 18, 2010

I'm running a dual boot Ubuntu 10.04/Backtrack 4 (Ubuntu 8.10) system. I can get internet in the BT4 side but not in the Lucid side. In Lucid I can ping my router, and the network manager says I'm good to go, but I can't get to any web sites. It all started when I tried to put my laptop on another network by mimicking the settings of a computer I had just unplugged from the network. MAC address and all.

ifconfig eth0:

Code:

eth0 Link encap:Ethernet HWaddr 00:1f:16:ba:4c:8c
inet addr:10.136.9.147 Bcast:10.136.9.159 Mask:255.255.255.240
inet6 addr: fe80::21f:16ff:feba:4c8c/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

[code]....

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Ubuntu Networking :: User Interface Changed And It Defaulted To Ethernet And Now It Won't Letting To Go Back On Wireless - Disable Ethernet?

Sep 1, 2011

My laptop was working fine on wireless till the userinterface changed and it defaulted to ethernet and now it won't let me go back on wireless How do i disable ethernet?

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Apr 14, 2011

I found multiple sites explaining how to add IPs to a network interface as virtual interface like eth0:0. However I can add IPs to an interface as well using the ip command: ip a a 192.168.2.2/24 dev eth0 What I want to know is how I can make this persistent on rhel/centos.

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General :: Get Eth0 Interface Doesn't Support Scanning

May 14, 2011

I am trying to connect my fresh new Ubuntu 10.10 to my router. However I am having a bit of difficulty. This is what I have done so far:

Code:

lspci

My devise is a Broadcom Corporation BCM4311 802.11b/g WLAN (rev 02). Then:

Code:

sudo ifconfig eth0 up
sudo iwlist eth0 scan

I get eth0 Interface doesn't support scanning.

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General :: Virtual Interface Eth0 1 Disable At Boot Time

Feb 10, 2010

I have set 'ONBOOT=no' in interface script '/etc/sysconfig/network-scripts/ifcfg-eth0:2' but my interface bring up at boot time, what is the problem , I have checked it 3 or 4 diff os/machine but the same issue. Can anyone please help me to disable virtual IP's at boot time that network script make it up every boot time.

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Dec 26, 2010

i install kernel rpm after i boot that kernel network not working kernel name : kernel-rt-trace-2.6.24.7-132.el5.centos.i686 [URL] error "Bringing up interface eth0: Device eth0 has different MAC address than expected, ignoring."

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General :: Change Ethernet Adapter Name Eth0 To Eth1 And Vice Versa

Jan 29, 2010

i have just installed fedora core 12. my pc has 2 lan adapter. 1. onboard rhine. 2. intel card. os has given eth0 to onboard card and eth1 to intel but i want eth0 to intel card and eth1 onboard card.

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General :: Clear IP Address Of Ethernet Interface?

Jun 17, 2010

What is the Linux command to clear IP address of an interface without bringing it down and/or restarting network services. Seems strange ifconfig is able to change IP address but has no option to clear it, or am I wrong?

EDIT:As simple as ifconfig eth0 0.0.0.0. They should have put it in the man

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General :: Virtual Interface Usage - Two Ethernet Ports

Jun 28, 2010

I need to ask about Virtual Interface, as I need to use my ethernet interface to act as two ethernet ports. As I need to give eth0 an IP address and give eth0.5 another ip address, and make some natting and other issues. Can I do that with the same interface?

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Oct 11, 2010

I just installed Fedora Core on my Dell Inpsiron B130 laptop and I am having trouble connecting to the internet both wirelessly and with an ethernet cord into the router. When trying to configure my network, I dont recognize any of the ethernet adapters in the drop down list. I have been told that my wireless card is Linux compatible (dell y8029 dell wireless 1370 802.11/a/b/g mini pci). My ethernet card is a B130 Broadcom Ethernet Driver which isnt in the drop down menu either.

I read that I need to download an ndiswrapper but I dont know where to find this download AND even if I could download it to a zipdribe, I have trouble opening a USB flash in Linux becuase its not a "valid block device". This is after the command "mount /dev/sda1 /mnt/usbflash"

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Apr 5, 2010

I installed FEDORA 8 on my laptop for a class project. everything went find except. with I attempt to connect to any network. I keep getting the no network device error. so I tried to install the Ethernet and wi-fi driver directly without success.

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Aug 13, 2010

I'm having the same Harker2010 's problem.Running 10.04 LTS on a Dell latitude D-820, and switching between lan and wifi worked OK until last upgrade.Harker2010's screenshots are also valid for my problem. I've tried everything I see on this post but the problem still there.

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CentOS 5 :: It Does Not Recognise The Eth0 Ethernet Card?

Feb 9, 2010

I am attempting to install centos5 x86_64 on to an HP Compaq 6820s laptop.It appears the installation has gone ok but I have a big problem in that the centos installation knows nothing about the hardware on the laptop. i.e. it does not recognise the eth0 ethernet card.this means that I have no way of assigning an IP address to the laptop which means that it cannot join the network or the internet.how do you go about getting the correct drivers for the hardware that you are using?

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Programming :: Interface "eth0" Which Is Down - Wasn't Displayed But Loopback Interface Has Been Displayed

Jan 6, 2011

The following are the output of command "ifconfig -a":

[Code]....

The interface "eth0", which is down, was not displayed, but loopback interface has been displayed. So, how can I make my application display all interfaces, including the interfaces which are down, but excluding the loopback interface?

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Ubuntu Networking :: Eth0 Isn't Connecting To Router?

Jul 18, 2010

I downloaded wubi, installed ubuntu, and booted it up. Everything went smooth, it finished installing with no problems. It restarts again and I login. Firefox opens.....server not found.

That brings you to where I am now. It says that eth0 is connect. I manually changed the ip address, the netmask and gateway. Still I have no luck.

route reads as follows:
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.1.1 * 255.255.255.255

[Code].....

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Ubuntu Networking :: Why Does OS List The Router As Eth0

Jun 17, 2011

i recently switched over from windows xp and instead of listing my 2wire router it just says eth0 now

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May 28, 2010

i'm using toshiba laptop, i need to connect my lap to internet but i didnt found the linux based drivers for realtek ethernet.

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Networking :: Set Up A Laptop As A Router To Connect Wirelessly To ADSL Router?

Nov 6, 2009

I have a desktop PC running Ubuntu 9.10 and Windows 7, and a Eee PC 701 laptop running EasyPeasy Ubuntu 9.04. I'd like to connect the desktop to the laptop with a wired connection (eth0), then the laptop to my ADSL router using wireless (ath0).

I have a crossover ethernet cable (I bought on ebay). I have set up my laptop with a static IP address on my LAN and it uses OpenDNS.

I have added this to /etc/sysctl.conf on the laptop:

net.ipv4.ip_forward=1

Then I tried this on the laptop:

sudo iptables --table nat --append POSTROUTING --out-interface ath0 -j MASQUERADE
sudo iptables --append FORWARD --in-interface eth0 -j ACCEPT

This is a variation on what I found on other sites describing how to set up a router. I don't understand iptables very well, but I gather that the above two lines should set up forwarding so that traffic from my router to the laptop will be forwarded to the desktop, and vice versa.

But this doesn't work. The connection doesn't even establish between the laptop and the desktop.

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