Ubuntu Servers :: Eth0 Doesn't Start After Interfaces Modified

Aug 12, 2010

I have three VMs (VMWare Server 2) all running Ubuntu Server 10.04. (one I asked to be a samba share from the outset, the others are blank server installs, no pre-config)

I follow the layout in the community documentation regarding setting up firewall rules through iptables. I.e. I create a file called iptables.rules and place it in /etc. I then modify the /etc/network/interfaces file to look like this:

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
# The loopback network interface
auto lo


However this third one I have reinstalled Ubuntu 3 times now, and every time as soon as I modify the /etc/network/interfaces file, eth0 fails to start up (is not visible in ifconfig, only the loopback adapter), and no networking works.

I have tried reducing the iptables.rules file (which is a carbon copy across all machines anyway) to a basic accept all rule, and it still doesn't like it. As soon as I remove those two extra lines in the interfaces file, the network starts up no problems and eth0 is there.

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Ubuntu Servers :: /etc/network/interfaces Doesn't Set IP Address With OpenVZ?

Jun 4, 2010

I'm building up a server based on 8.04 LTS. It's using OpenVZ, and as part of that it creates a virtual network interface venet0. I add a stanza to /etc/network/interfaces that looks like this:

allow-hotplug venet0
iface venet0 inet static


Looking further, I note that /etc/init.d/networking is not symlinked into anything other than the rcS.d directory. It's been a while since I've been tinkering at this level, but I understand that there should be a symlink from rc2.d/Sxxnetworking into ../etc/init.d/networking. So I wonder where eth0 is getting configured.

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General :: Eth0 Wlan0 - Net.lo Doesn't Start

Jun 25, 2010

In an attempt to set up wireless so I could connect to the university network, which I think I probably should have just downloaded network manager or something but I didn't, I tried to put things in /etc/conf.d/net and some other places and I am afraid I'm not sure exactly what (and I have learned my lesson! I will pay attention to what I am doing so I can undo it next time I mess around with stuff!)

Anyway, the long and the short of it is now, when the computer is starting up and its doing the init stuff net.lo doesn't start. Later try and start net.lo or net.eth0 you get told "not enough arguments"

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Ubuntu Networking :: Get "wlan0" And "eth0" Interfaces To Start At Startup?

Jul 3, 2010

Quick question guys and gals: How do I get "wlan0" and "eth0" interfaces to start at startup as as well as for "dhclient" to obtain an IP address automatically for "eth0?"

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Fedora Networking :: Enable 3 Interfaces \ When Start One Interface The Another Interfaces Goes Down?

Jan 25, 2010

I have 3 Interfaces for a different LAN's and when I start one interface the another interfaces goes down.How can it's possible?I configure my ethernets as:

/sbin/ifconfig eth0 netmask broadcast
/sbin/ifconfig eth1 netmask broadcast
/sbin/ifconfig eth2 netmask broadcast

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Ubuntu Servers :: 10.10 - Setup Eth0 With Subdevice Eth0.0 And Eth0.99 To Come Up At Boot

Apr 22, 2011

im trying to setup eth0 with subdevice eth0.0 and eth0.99 to come up at boot

eth0 is dhcp clint
eth0:0 is static ip
eth0.99 is 802.1q vlan interface
auto lo

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Ubuntu Networking :: Why Etc/network/interfaces Does Not Contain Eth0

Jan 1, 2011

So far as my knowledge goes, /etc/network/interfaces is supposed to contain a list of all the available interfaces. But my /etc/network/interfaces looks like this,auto loiface lo inet loopbackBut I have a perfectly working eth0 connection. Why does not it appear here?

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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 :/


* 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


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Debian :: Identify The Network Eth0 - Eth1 - Eth2 Interfaces?

Jun 15, 2010

How do Linux identify the eth0, eth1, eth2 interfaces. For instance I plug in a network cable in to an interface. How do Linux recognize the plug in interface is eth0 or eth1?

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Networking :: Pinging Multiple Interfaces - Getting Pings From Eth0 But Not From Eth1?

Feb 26, 2011

I have two network interfaces and their entries are shown as eth0 and eth1... I want to assign them static IPs which I do by

ifconfig eth0 netmask up
ifconfig eth1 netmask up

But I am not sure if it will ping both the interfaces if I issue a command

ping -I eth0 (machine in network)
ping -I eth1 (machine in network)

I am getting pings from eth0 but not from eth1

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Networking :: IPtables Port Forwarding \ Have A Computer With Two Interfaces Eth0(LAN) And Eth1(WAN)?

Apr 20, 2011

I have a computer with two interfaces eth0(LAN) and eth1(WAN).I have followed some guides on the internet and came up with this iptables configuration:

# Generated by iptables-save v1.4.4 on Wed Apr 20 09:43:12 2011


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Ubuntu Networking :: Messed Up /etc/network/interfaces - Original Auto Eth0 Setup Is Missing

May 24, 2010

I'm trying to setup my interfaces along side GNS3 for study purposes, and came across a ..... vid saying to try this (my current config)


I'm praying for some crappy syntax error, also in Network Connections... its now blank, the original auto eth0 setup is missing

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OpenSUSE Install :: How To Get Start Option Modified Automatically

Mar 1, 2010

After the install on the hd I had to modify manually the start option otherwise I wouldn't. I found out in the option that I have to give: pci=noacpi and the start will go on. My question is, how to do this automatically, I mean modifying before every boot would be annoying.

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Fedora Servers :: Apache Httpd Doesn't Start On 11

Sep 3, 2009

I have just installed Fedora 11 on a "fresh machine" and everything works ok, except for Apache httpd
the message seen in the error_log is the following: Name or service not known: mod_unique_id: unable to find IPv4 address of "myserver"

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Server :: Rsyslogd Doesn't Seem To Listen On All Interfaces

Dec 5, 2009

I'm running ubuntu 9.10, the box has 2 network interfaces. I've got rsyslogd running on this box also. On one of the interfaces I have a VoIP ATA which I've configured to send syslog messages to the ubuntu box, however they're not coming up in the log file (I've configured syslogd.conf to capture logs for local2.debug and local3.debug).

rsyslogd seems to be working ok for data coming through on the other interface, but not this one. I've verified the ATA is sending data by using tcpdump and have confirmed it's using local2.debug and local3.debug. It seems perhaps it might not be listening on all interfaces? rsyslog is running with the -c4 switch.

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General :: /etc/network/interfaces Doesn't Get Loaded Automatically

Feb 17, 2011

In Ubuntu 9.10 I configured manually network settings to /etc/network/interfaces, and it works fine when I run /etc/init.d/networking restart.

Problem is that those settings are not loaded to GUI application (Preferences/Network connections).

I don't want to edit my preferences there, I just want to use my interfaces file as default! Do you know what's going on?

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Ubuntu Servers :: OpenVPN - Trying To Get Br0 Interfaces To Come Up?

Aug 5, 2010

I'm trying to get OpenVPN working but when I try to bring my br0 interface up it gives me an error.The below messages is from when I run


/etc/init.d/networking restart


root@server:/etc/openvpn# /etc/init.d/networking restart
* Reconfiguring network interfaces... ssh stop/waiting
ssh start/running, process 28263


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Ubuntu Servers :: Network Interfaces Not Working

Feb 26, 2011

I have been trying to set up Ubuntu server 10.04-2 and am a couple issues.

One issue is that the network interfaces aren't starting properly. I have to start them manually. I've tried to edit the /etc/network/interfaces with the following.

auto lo
iface lo inet loopback
auto eth0
iface eth0 inet static


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OpenSUSE Network :: Help_no Interfaces Shown In Yast-firewall - Dns Server Won't Start

May 1, 2010

This morning I was configuring a DNS server through Yast at home, I've done it once before (in another wireless lan)and it works perfectly. But this morning, after I clicked "start dns server now", everything freezed, and caps lock light on keyboard kept flashing. I rebooted laptop,it couldn't boot into run level-5 and there were few "skipped" items and "failed" items displayed.... Sorry I'm new to linux so I re-installed it this afternoon, and kept /home partition, formatted / partition.

Everything seems to be fine after re-installation, again I tried configuring a DNS server and clicked "start dns server now", but the same problem appeared, caps lock light kept flashing and I rebooted the laptop but fortunately this time it didn't fail on any items when booting

In Yast-Network Settings, I choose "use controlled with network manager", and I can connect to wireless router and browsing web, but there are no any interfaces shown in Yast-Firewall, and this time, after I clicked "start dns server now", nothing happens, dns server just won't start...

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Ubuntu Networking :: ADVISEADDR: Error In Specifying Interfaces: No Existing Ip Interfaces Found

Jan 7, 2010

I have a weird issue that I have not seen on any forum. My jaunty on DELL studio laptop seems connected to net, but I can not access any network service (ssh, firefox etc.). But when I connect a cable the cable lights blink as it should be and in wireless connection my wifi light blinks.

It was working 2 days ago without problem, and I have not done big changes recently.I removed and reinstalled network-manager and network-manager-gnome. Nothing changed. I see a message in each restart as follows (when Openafs is starting). I can reproduce it with "/etc/init.d/openafs-client restart"


ADVISEADDR:error in specifying interfaces: no existing ip interfaces found



04:00.0 Network controller: Intel Corporation Wireless WiFi Link 5100
08:00.0 Ethernet controller: Broadcom Corporation NetLink BCM5784M Gigabit Ethernet PCIe (rev 10)
#lshw -c network


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Ubuntu Servers :: Messed Up Networking Interfaces File

Dec 25, 2010

For my router I need to change Ubuntu server from DHCP to static IP. So to do this I entered: Code: sudo vi /etc/network/interfaces ...and pushed the wrong buttons and exited the session suddenly by mistake. After learning how to use the vi editor I went back but I got a notice that the the last session didn't close properly and that a "swap" file had been created. Anyway, I entered my static IP info, saved the file, and attempted to restart with:

Code: sudo /etc/init.d/networking restart Restart failed and I got a notice that I should delete the /etc/network/interfaces.swp file so I did. Tried to restart again and, didn't get the .swp file conflict message this time, but failed again - this time I got the following message:


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Ubuntu Servers :: Editing /etc/network/interfaces To Obtain A Static IP?

Jan 25, 2010

how to edit and save this file using Vim-noX. (connected via putty) I have the file loaded up and Ive inputed the needed data for my static IP, but I cant for the life of me figure out how to close and save my settings. At the bottom of the command line I have "INSERT" which toggles with "REPLACE" and I just cant figure this out.

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Ubuntu Servers :: After Initial Reboot - Network Interfaces Can't Be Found

Feb 10, 2011

Last night I created a fresh install of Ubuntu Server 10.10. I was working through a tutorial to set up a development server for home use, and everything worked perfectly. I was able to install OpenSSH, Apache, MySQL, and PHP (and Vim) with no problems. I was also able to use "ifconfig" to determine the network address of the server and I was able to view web pages on the server from another machine on my home network, using a browser. So, everything was "peachy". [By the way: The server is connected to the router using a CAT5 cable. This is a WIRED connection] I shut the Ubuntu server down at the end of the night and, now that I have rebooted this morning, I have apparently lost the network interface. I cannot ping anything from the server. If I run ifconfig, only the "lo" configuration is listed, with the address.


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Ubuntu Networking :: Adding Interfaces To /etc/network/interfaces?

Apr 16, 2010

If I try to add a new interface (eth1) to /etc/network/interfaces, I get

* Reconfiguring network interfaces... SIOCSIFADDR: No such device
eth1: ERROR while getting interface flags: No such device
SIOCSIFNETMASK: No such device


How do I add 2 interfaces and get anyone of them to work, as available ?

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Fedora Networking :: Can't Start Eth0

Jul 9, 2010

I can't start eth0 and have read thru many of the threads on this and can't figure it out. What does this message mean?

[jeff@chladni ~]$ ifup eth0
Active connection state: activating
Active connection path: /org/freedesktop/NetworkManager/ActiveConnection/13


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Ubuntu :: Wakeonlan Request Eth0 Doesn't Autoconnect

Aug 27, 2010

Running Ubuntu 10.04.Based on this guide, http://ubuntuforums.org/showthread.php?t=360901 I have WOL working, but to a certain degree. I set my MB bios up, installed the appropriate apps, setup rc.local to start ethtool -s eth0 wol g. I sent a wakeuplan command from another machine and the PC started up.

The only issue is that when it comes out of hibernate from the wakeonlan request eth0 doesn't autoconnect, so if I try to remotely wake it, once it boots into the gui eth0 will remain disconnected until I manually start it.

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Ubuntu Networking :: Internet Eth0 Doesn't Work?

Apr 30, 2011

my internet was fine.. until.. i had to work in the school so.. a teacher configured the internet settings.. for something .. ( i don't remember) and everything was fine. but when i returned to my house and conected my lap to internet (cable) the internet didn't work.

ubuntu@VR:/etc/network$ ifconfig
eth0 Link encap:Ethernet direcci�nHW 00:1d:72:46:38:3c
Direc. inet: Difus.: M�sc:
Direcci�n inet6: fe80::21d:72ff:fe46:383c/64 Alcance:Enlace


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Ubuntu :: Eth0 Works Without Configuration - PC Doesn't Seem To Care About Anything

Mar 14, 2010

my internet connections works via my eth0 adapter. For Windows user this may be fine, but I actually would like to know what makes it connect. My /etc/network/interfaces shows:


No eth0 mentioned here. dhcp3/dhclient.conf consists only of commented-out lines, so no eth0 here either. In /etc/init.d I see there is this networking daemon. When I do


that magically enhanced eth0 works even if you want to shut it down. No wonder I don't get my wlan0 working, my PC doesn't seem to care about anything I am configuring here.

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OpenSUSE Network :: Get Eth0 To Start Up At Boot Up

Jun 22, 2010

My eth0 is not up everytime at boot up. I will need to <service network restart> to get it up.

I have used yast's /etc/sysconfig editor to set /etc/sysconfig/network/config -> MANDATORY_DEVICES to eth0

And I have also added <alias eth0 e1000e> to /etc/modprobe.conf.local

And also set eth0 device to activate device at boot time using Network Card Setup.

But eth0 is still not starting up at boot time. What should I do to get it up at boot time?

I'm using openSUSE 10.3. And no, I'm am unable to move to 11.2

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Jan 6, 2011

my eth0 connection is not automatically connected when fedora starts. I checked " activate device when windows starts" in network configuration. still it is not auto connecting and after connection the network icon is not changing to connected status although it is connected.

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