Ubuntu Networking :: Eth0 Not Coming Up Automatically With Dhcp (11.04)

May 25, 2011

I have this in my /etc/networking/interfaces file:

auto lo
iface lo inet loopback
iface eth0 inet dhcp
pre-up iptables-restore < /etc/iptables.rules
post-down iptables-restore < /etc/iptables.rules

but eth0 doesn't automatically come up. I have to do a "ifconfig eth0 up" and then do a dhclient eth0 in order to get an IP after each reboot.

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Ubuntu :: Eth0 Not Coming Up Automatically?

Mar 24, 2011

I have a server with two NICs. I tried to bond their network interfaces together, but it bombed out and didn't work, despite the fact I copied the example 100% except for my own numbers for addresses, etc. I decided to go back to a single NIC and let the other unused for now, since I need to get this server running. uh. yesterday.

[Code]...

When I boot up, often times eth0 isn't listed in ifconfig. I'll see eth1, which is just an unused interface at the moment, but eth0 is no where to be found. If I restart the network service, bam. I'm good. Why is it not auto coming up?

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Networking :: Eth0 Fixed IP - Eth1 DHCP Gateway - Access To Eth0?

Aug 19, 2009

5.10 Breezy configured as machine controller. Works great eth0 is a fixed IP to communicate with controller comms board. Not easy at all to alter - the comms board is hard coded to listen on eth0 for commands.

I can use eth1 as the default gateway and ping google.com, etc. But when I now attempt to communicate with the controller with netcat, e.g.

Code: echo !HH | nc 192.168.1.6 80

I obviously never get an answer since the request is passed via eth1. Using the -g option with netcat doesn't work either. I had a look at iptables but it doesn't seem to be able to do what I want. How I can still use eth0 as my communication port to the controller whilst eth1 is the default gateway?

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Networking :: Network Interface Not Coming Up Automatically At Boot?

Feb 10, 2010

I installed Fedora 12 on an Eee PC 1001HA. This laptop has a Ralink RT3070 wireless chipset, for which the driver is not yet in the kernel (still in staging I believe). However I downloaded the driver, compiled it, and installed it. AFAICT, it works fine.

One small obstacle remains: I am uable to get the network interface to come up automatically; I have to run # ifconfig ra0 up. Because of this NetworkManager never sees the wireless interface, making connecting to WAPs a chore.

I created a ifconf-ra0 file in /etc/sysconfig/network-scripts, and it includes the line ONBOOT=yes, but this doesn't do the trick.

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Networking :: Unknown Host - Placing Eth0 In Dhcp Through The GUI And Bash But Always Get A 169 Address Or 127

Jan 22, 2010

I'm having an issue configuring eth0. I'm using ubuntu 8.10 in a virtual machine (VirtualBox). The correct adapter is being used and it has worked in the past. I've tried placing eth0 in dhcp through the GUI and bash, but always get a 169 address or 127.

When I run the following command:

Code:

The output is:

Code:

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Fedora :: Eth0 Not Coming Up On Boot, FC10

Oct 17, 2009

Sometimes (but not every time), when booting my Dell Inspiron 530, eth0 will not come up right away. I can boot and log in to Gnome, and the NetworkManager applet shows that the ethernet cable is unplugged. After sitting for 5-10 minutes, it will link up and everything works. If I unplug the network cable and plug it back in, it comes right up. But once it's linked, it works fine and never disconnects after that. I've tried switching to a different port on my switch and a new ethernet cable. So I suspect it's some sort of weird kernel problem. I checked /var/log/messages and the only thing that looks weird is:

Oct 17 07:51:49 obi-wan kernel: e1000e: Intel(R) PRO/1000 Network Driver - 0.3.3.3-k6
Oct 17 07:51:49 obi-wan kernel: e1000e: Copyright (c) 1999-2008 Intel Corporation.
Oct 17 07:51:49 obi-wan kernel: e1000e 0000:00:19.0: PCI INT A -> GSI 20 (level,

[Code].....

But I have a second Inspiron 530 that has the same entry and it works fine. Has anybody seen a problem like this? I've looked around and so far can't find out the exact issue. I've upgraded NetworkManager to the latest version for FC10

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Ubuntu Networking :: Wired Connection - Can't Connect - Dhcp Enabled Automatically

Jun 20, 2010

Since that time I moved to Archlinux and I love it. I do however run lubuntu live from a USB for my work PC. I am having a problem with it. I think it's okay to post here because the core of the system is still Ubuntu. I don't think LXDE is the problem. I start up the live environment and it says 'wired connection connected' but I can not load any pages or do anything.

I thought it may be a problem with configuration so I copied down (from Windows) the IP, Subnet, Gateway and DNS. I put them in manually and it doesn't say connected any more and still no connection at all. I am unsure what to do from here. I am not really familiar with Ubuntu enough to try much. I tried to 'dhcpcd eth0' but dhcpcd isn't installed. I guess the default Ubuntu network manager has dhcp enabled automatically.

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Debian Configuration :: Broadcom BCM4313 Not Coming Up Automatically After Update?

May 1, 2011

I'm using testing/Wheezy 64 bit: after upgrading to the latest repository kernel (2.6.38-2-amd64) my WLAN card isn't showing up unless I do a "modprobe brcm80211" or add " brcm80211" to /etc/modules.

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Debian Configuration :: Eth0 Keeps Reverting To DHCP?

Feb 19, 2011

Freshly installed Lenny system. Edited /etc/network/interfaces to use a static IP:

# The loopback network interface
auto lo
iface lo inet loopback

[code]...

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Slackware :: Disable Dhcp Polling For Eth0 At Boot Up?

Apr 20, 2010

During installation I set eth0 to use dhcp to get an IP address. I then installed gnome and networkmanger which handles my interfaces and works fine. But during bootup the system pauses for 5 seconds or so while it polls for dhcp. It then times out and gives me a 169.254.xx which is then replaced when networkmanager starts up at the end of bootup.

How do I stop the polling to cut out the 5 seconds?

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CentOS 5 Server :: DHCP Config ( No Subnet Declaration For Eth0 )?

Apr 1, 2011

I had a server that I use for Radius DNS and Trying to put DHCP on it I have My pool in it seems right. I have 2 adresses aliased one being a helper IP that the router will send the request to. When I try to start the dhcp server I get the following.

Mar 31 14:33:11 rad2 dhcpd: No subnet declaration for eth0 (76.164.173.2).
Mar 31 14:33:11 rad2 dhcpd: ** Ignoring requests on eth0. If this is not what
Mar 31 14:33:11 rad2 dhcpd: you want, please write a subnet declaration
Mar 31 14:33:11 rad2 dhcpd: in your dhcpd.conf file for the network segment
Mar 31 14:33:11 rad2 dhcpd: to which interface eth0 is attached. **

[Code]...

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Networking :: Production Server With Static IPs On Eth0 And Eth0:1 - Getting Private LAN On Eth1?

Jul 1, 2010

I have two servers on a vlan at my datacentre/colocation and previously both servers had public IPs on their eth0 interfaces. The servers are HP ProLiant DL360s - one is a G4 and one is a G5 The newer G5 is now the LAMP server and the G4 has been retired and I want to repurpose it as an iSCSI target using openfiler freenas or similar.

My G5 has public/static IPs lashed to the eth0 physical interface and the eth1 is not configured to do anything yet. The G4 will have both interfaces available - perhaps one for ssh access from one of my static public IPs and the other to be a private IP on the local vlan. Here is what I am trying to get my head around...

The G5
eth0 - Public IP - full LAMP services on two or three virtual interfaces
eth1 - Private IP 192.168.0.1
The G4
eth0 - Public IP for ssh
eth1 - Private IP 192.168.0.2

Because my traffic between eth1 on these boxes is via private IPs on the local private vlan it doesn't add to my quota for bandwidth. How do I go about configuring the routing and gateways and other aspects of this so that I can run a private IP space network between the eth1s and still serve the outside world from the eth0s...

I am afraid that if I assign the private IPs to the eth1 interfaces the routing may either not work or interfere with the access to the production internet facing interfaces (eth0s).

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Ubuntu Networking :: DHCP Server No Longer Responses To DHCP Requests - Can't Ping Gateway

Oct 22, 2010

Back in April I set up a Ubuntu DHCP server and a multiple VLAN network [URL] to migrate our various servers, workstations, etc off the 192.168.1.1 /24 network that everything was on because we where running out of address space. I built out the new network and everything worked great except our AD server would never get an IP address from the DHCP server (static reservation) and even if I set the IP statically on the AD server it couldn't ping the gateway and noone could log in. After several attempts to resolve this, including bringing in outside help, we where never able to figure out what the problem was.

Now 6 months later I have time to revisit the issue without effecting the live network. I used Acronis and imaged the AD server last Friday, cloned it on to another box with the same hardware, and put it up on the new network that's been sitting unused for the last 6 months. Today when I statically set the IP on the AD server (which is what I want) it connects and I can ping it's gateway 192.168.1.1 and all the way across vlans to a test sales agent workstation at 192.168.8.xxx on vlan 800 but only if I statically assign the agents station an IP address. When I try to get an IP address via DHCP it fails as destination unreachable. Nothing has changed in the last 6 months on the DHCP server but now it for some reason can't ping its default gateway 192.168.1.1. All of the config files are the same as they where left from the post linked above aside from the vlan id's used where changed from 1's to 100's (i.e. vlan 3 is now vlan 300) /etc/network/interfaces

Code:

auto lo
iface lo inet loopback
auto vlan100
iface vlan100 inet static

[code]....

why it can't reach the gateway, when I do a tcpdump I can see the DHCP requests come in on eth0 but the server never responds and I'm pretty sure its because it isn't "seeing" them since it thinks there isn't a network connection but I don't know how to trouble shoot to find out where the problem lies.

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Ubuntu Networking :: DHCP Server No Longer Responds To DHCP Requests - Can't Ping Gateway

Jul 1, 2010

Back in April I set up a Ubuntu DHCP server and a multiple VLAN network [URL] to migrate our various servers, workstations, etc off the 192.168.1.1 /24 network that everything was on because we where running out of address space. I built out the new network and everything worked great except our AD server would never get an IP address from the DHCP server (static reservation) and even if I set the IP statically on the AD server it couldn't ping the gateway and noone could log in. After several attempts to resolve this, including bringing in outside help, we where never able to figure out what the problem was.

Now 6 months later I have time to revisit the issue without effecting the live network. I used Acronis and imaged the AD server last Friday, cloned it on to another box with the same hardware, and put it up on the new network that's been sitting unused for the last 6 months. Today when I statically set the IP on the AD server (which is what I want) it connects and I can ping it's gateway 192.168.1.1 and all the way across vlans to a test sales agent workstation at 192.168.8.xxx on vlan 800 but only if I statically assign the agents station an IP address.

When I try to get an IP address via DHCP it fails as destination unreachable. Nothing has changed in the last 6 months on the DHCP server but now it for some reason can't ping its default gateway 192.168.1.1. All of the config files are the same as they where left from the post linked above aside from the vlan id's used where changed from 1's to 100's (i.e. vlan 3 is now vlan 300) /etc/network/interfaces

Code:

auto lo
iface lo inet loopback
auto vlan100

[code]....

why it can't reach the gateway, when I do a tcpdump I can see the DHCP requests come in on eth0 but the server never responds and I'm pretty sure its because it isn't "seeing" them since it thinks there isn't a network connection but I don't know how to trouble shoot to find out where the problem lies.

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Ubuntu Networking :: If DHCP Not Available - Fallback And Start DHCP Server?

Mar 8, 2010

Currently I have my eth0 interface getting a DHCP address but at times the DHCP server will not be reachable. Sooo what I would like my server to do is if it cannot find a DHCP server assign a static address to eth0. Then start the DHCP service so it can then dish out some addresses.How can I do this? Surely it is possible

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Debian Configuration :: Eth0 Is Not Starting Automatically On Boot

Nov 30, 2015

I am using Debian 8 with systemd. I noticed that eth0 it is not starting automatically.

During boot process, I see this message: a start job is running for LSB: Raise network interface

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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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Networking :: Configure A (openSUSE) Client To Dhcp To EBox DHCP Server - Lease An IP Address

Mar 25, 2010

I am puzzled with trying to configure a linux (openSUSE) client to dhcp to eBox DHCP server. I am using dhclient to lease an IP address with dhclient eth0 -s 10.45.48.108 and get a response

openSUSE11232CL1 dhclient: DHCPDISCOVER on eth0 to 10.45.48.108 port 67 interval 4
openSUSE11232CL1 dhclient: DHCPOFFER from 10.45.48.108
openSUSE11232CL1 dhclient: DHCPREQUEST on eth0 to 10.45.48.108 port 67
openSUSE11232CL1 dhclient: send_packet: Network is unreachable
openSUSE11232CL1 dhclient: send_packet: please consult README file regarding broadcast address.

The server reports eBox141 dhcpd: DHCPDISCOVER from 00:0c:29:3e:57:a3 (openSUSE11232CL1.domain.net) via eth0
eBox141 dhcpd: DHCPOFFER on 10.45.200.2 to 00:0c:29:3e:57:a3 (openSUSE11232CL1.domain.net) via eth0

I interpret this as the server receives the request and the client accepting it but the lease does not last long and the connection breaks. what this could be and why the connection breaks? Or my undestanding is totally wrong on how it works and should work? And BTW, where is that README file that's referenced in the message I receive on the client?

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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
/etc/network/interfaces
Code:
auto lo
[Code]....

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Fedora Installation :: System Does Not Connects Automatically When Start's To Eth0 - Changed Host's Name

Mar 26, 2009

now my system does not connects automatically when fedora start's to eth0 i have to connect it manually by pull down menu in the beginning hostnname was dbe272b22.dslam-172-17-161-245-0532-474.dsl.cantv.net i do not remember if the last part ".cantv.net" was there.... i changed hostname "dbe272b22.dslam-172-17-161-245-0532-474.dsl" maybe ending with ".cantv.net" with system-config-network for hostname "edicta" i modified /etc/hosts by hand twice, now do not remember what i did exacly but here you can see /etc/hosts

[Code]....

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Server :: Squid Access / Setup Automatically Get The Proxy Setting As Dhcp?

Jun 15, 2011

I my office I have configure dhcp in my centos sever
eth0 for adsl-setup
eth1 for lan 172.16.0.4
I am using squid proxy server for internet access,

in my office all are using laptop through wifi , so i need to configure the browser proxy setting for accessing internet.

is there any way to setup automatically get the proxy setting as dhcp. I have tried transparent proxy but no success.

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CentOS 5 Networking :: Kernel Rpm Install After Error "Bringing Up Interface Eth0: Device Eth0 Has Different MAC Address Than Expected, Ignoring"

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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Networking :: Sending Video Streams From Eth0 And Eth1 To The Other Server Programs' Eth0 And Eth1?

Jul 30, 2010

I try to generate a server client code. What i try to do is sending video streams from eth0 and eth1 to the other server programs' eth0 and eth1. In order to do that, i decided to use SO_BINDTODEVICE. But the code is not working. Am i misunderstood the usage of SO_BINDTODEVICE.

1-Defining two ports
2-Defining two sockets
3-Assigning host ips on them

[code]....

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Ubuntu Multimedia :: Displays Sound Is Coming Out When Play A Song But No Sound Is Actually Coming Out

Mar 24, 2011

i have uninstalled and reinstalled alsa and made sure its not muted, in pulse audio it displays sound is coming out when i play a song, but no sound is actually coming out.. i dont want to go back to windows, but if i cant get sound im going to have to

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Ubuntu Networking :: Wifi Coming On And Off?

Aug 8, 2010

I built a HTPC using Zotac ION ITX A 330 (has an onboard Atheros AR9285 according to lspci) and the plan was to connect this to my Netgear WNR2000 using WiFi. The OS is Ubuntu 10.04. I can connect to the router fine. Signal strength stable between 65-72% so this shouldn't be an issue (other hardware including two laptops running Vista (DELL XPS) and OSX (MBP) connect just fine at the same location). I stay connected for everything between five to 60 minutes then i lose the connection. According to the syslog i get deauthenticated due to reason 2. I've tried the backport modules.I've also tried wicd instead of the standard gnome Network manager. No difference.

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Ubuntu Networking :: Atheros NIC Not Coming Up At Capacity?

Apr 20, 2010

Just rebuilt my file/print server using an ECS 945GCD-M Atom motherboard. Running it under 9.10 (2.6.31-20) using the same cable and port on my Netgear switch that my old server connected to at 1GB/s without issue (old server's NIC was Intel-based).

Found the driver is an AR813x, & downloaded & installed the latest driver from here (1.0.1.9). sudo lshw -C network now shows that it's using the new driver, but still sitting at 100MB/s:

Code:
*-network
description: Ethernet interface
product: Attansic Technology Corp.

[Code].....

I can't seem to get it to come up at the full 1GB/s. I also tried ethtool -s eth0 speed 1000 without success. why networking restart ignores eth0?

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Ubuntu Networking :: NetworkManager Not Working, Wifi Not Coming Up?

Jun 28, 2011

Suddenly my wireless card isn't coming up automatically.The following sequence fixes it:

Code:
ifconfig eth1-eth0 up
killall NetworkManager

[code]....

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Sep 27, 2010

I have a hardware device with two ethernet ports, eth0 and eth1 running Centos 5. Basically my goal is to forward packets from eth0->eth1 and eth1->eth0 as well as get a copy of these packets for analysis. If I set IP routing to do the forwarding then I won't get a copy of the packets for analysis.

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Networking :: Directly Forward Everything Coming Into An IP Address Or Should Try VPN

Apr 26, 2010

My task is, to set up a(nother) server for our server room. Access is difficult, closed doors, remote location, etc. Therefore my idea was, to install, configure, etc. everything in my office. Since the server will have to work in the DMZ, I can't do much in my office; I have no DMZ-address here. Therefore I was thinking of 'forwarding' the future IP-address in the DMZ, let's say 10.10.10.1/24, from a stub machine placed in the server room into my office. I wonder how to do this most favourable.

So I think port-forwarding around 10 ports with ten ssh sessions would be neither clever, nor elegant. I wonder if it is possible to directly forward everything coming into an IP address directly instead? Or should I try VPN?

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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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