Ubuntu Networking :: Lan Setup - Connecting To Eth0 Then Network Disconnected
Dec 22, 2010
i have limited experience with Ubuntu and Linux for that matter. i know my way around for the most part but i come from windows. anyway. i have 6 dell gx260 computers. i also have a netgear 8 port Ethernet switch. now im just trying to get the computers to see each other. simple for me in windows. but i have no idea where to start here. it just says connecting to eth0 then network disconnected. and thats it. for now im just working with 2 of the computers. the others are not set up yet. i have been googling for 3 days and got nothing that helps. (my goal after they see each other is to share files back and forth. and also to have one of them control the others with some type of remote desktop. but thats for another day.)
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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)
[Code]....
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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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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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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May 2, 2011
I can't figure out why my ethernet isn't recognizing its connection. ifconfig returns the hardware address, route -n returns an empty table
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Jan 13, 2010
i know this is crazy, but im using a [URL] and have loaded a copy of "red hat linux 7" on the computer. i have no idea what kind of hardware config/spec stuff i should have in my immediate vision, and if i did i'm not sure how i would make sense of it all. linux loaded fine. didnt save drivers. eth0 not showing in ifconfig report, but lo is connecting to network, other host cannot ping linux and vice versus
can mount a cdrom, but not a usb flash dont quite understand how the load methods work involving /mnt/cdrom/"usbutils-0.86tar.gz" eth0 problems and gnome rpm stupidity keeps me from upgrading sys from old version to a newer version, cant even find the cmd to show me that info, sorry. have usb files i want to mount, dont know how to loAD THE CDROM FOLES, SO EVEN THAT ISNT WORKING OUT HAVE DISCS WITH howtos just need to stay focused on steps to get desired end result, while trying to learn too much info for what im currently doing between all the f!@#@ing windows i have open.
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Jul 18, 2010
Everything worked fine until I downloaded some Ubuntu upgrades. Now, every time I try to connect to internet via network manager it says: " Network: Disconnected - you are now offline". so what to do...
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Nov 20, 2010
The title message appears when I log in. Neither wired nor wireless network adapters show in ifconfig output. Network manager shows a simple networking disabled greyed out message. Both adapters work in live cd boot. Everything was working properly before; I'm not sure what happened.
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Jun 12, 2011
I'm having network problems and I have no idea how to fix it. At first, my internet connection was suffering on all computers on my network (Mac, Windows and Ubuntu 11,04). So, I disconnected my cable-modem and then reconnected. Nothing.... So, I rebooted my Windows machine and the internet came back on that computer.
I then went to my Ubuntu computer and clicked on "auto eth0" (per the way I interpreted instructions from the internet). The symbol turned from the "two arrows" to what looks like a wireless, looking for a signal. I thought that maybe I should just reboot, as I did with Windows. However, when I did reboot, that same wireless symbol was there, then a message came up saying:
Code:
Wired Network: You are now disconnected
I can't seem to get my internet connection back on my Ubuntu computer, though it is working on every other computer on my network.
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Mar 20, 2010
I'm running Ubuntu Karmic Server with Xfce desktop, the problem is the network manager, it says it is disconnected, even though I am connected to my network and getting an internet connection. It wouldn't normally bother me, but I'm trying to setup a VPN using the network-manager-openvpn plugin. I put in the required details for the VPN connection, but as soon as I tick the "apply to all users" box, the information is lost. The information will remain if I don't tick that box, but it will not connect. when I try to select the VPN connection I just setup, nothing happens.
I've tried the exact same configuration on another desktop, running Ubuntu Karmic with Gnome desktop, the network manager works fine, my ethernet connection is showing as connected, and I can connect to the VPN no problem, the problem lies with the network manager in Xfce. Is there anyway I can get it to show as connected? it wont allow me to connect to the VPN otherwise, it's silly, because that adapter has a full working network connection.
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Jun 6, 2010
Ive installed 10.04 on my laptop and notebook. It works perfectly on laptop. On notebook the problem is it finds no Wireless network and just says disconnected. I have no idea how to connect it, I tried reinstalling Ubuntu but no luck. I tried looking it up on internet but no luck in finding help. its an MSI U130. The wireless is defently turned on.
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Jul 25, 2010
I installed xubunto 10.4 on my pc the other day and every thing was working fine and then the next day my wired network card went down. So I restarted it and it say Wired Network Disconnected. I tried doing sudo ifconfig eht0 up to try and bring the card back online but nothing happens. I also tried reinstalling xubuntu on my computer. Again my internet works then starts freezing up so I restart it and my ethernet card goes down again. I have tried also plugging it into the second ether net port on my computer but that does not seem to work. Also I went into my dhclient-script and went to the bottom to look at my network card stuff.
It reads
#Changed from 'ifconfig $interface inet 0 down' - see Debian bug #144666 ifconfig $interface inet 0
exit_with_hooks 2 "$@"
fi
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Feb 17, 2011
i used to download files using transmission bit torrent client. I download the torrent and once the download starts i will leave the system and check only after 4 or 5 hours later.But when i check the system again, the network connections were automatically disconnected.The download is getting stopped naturally. why my wired network connection is getting disconnected automatically if the system is idle?(ubuntu 10.10)
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May 21, 2011
I have successfully installed xubuntu on my 2nd partition of hard disk through unetbootin. everything works fine except wireless network. my ethernet works good, i am tethering through my android mobile no problem....just wireless says disconnected where as it is enabled. As far I know its sould scan all the available wireless AP near me and it should appear below wireless networks, and from there I should be able to select the AP which I want to connct...
Here are some commands log
My netbook is MSI wind U135DX
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Sep 1, 2011
I just installed Ubuntu 10.04, complete noob, but I can't connect to the internet. I connect the ethernet cable, select auto ethernet and the icon animates for about 30 seconds. But then I get a notification "Wired network Disconnected - you are now offline".
Don't know what other information I should provide. I tried a few things from different posts like editing the dhcpclient.config but don't really know what I'm doing and none of these worked anyways. I'm not even sure if they were solutions to a similar problem! I'm using the same connection on my Mac OS 10.4.11 (different machine) and I have no problems. Could I use these same settiings in Ubuntu? I don't know what the different fields represent or what I should input in manual settings.
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Dec 18, 2010
I have just installed Ubuntu 10.10 64bit on my laptop Toshiba Satellite A665-S6065 and I can connect to wired network but I can not connect to wireless network "Network Connections disconnected". Im following this post http://ubuntuforums.org/showthread.php?p=6183681
1. Machine Brand and Model (PC/Laptop): Toshiba Satellite A665-S6065
2. Wireless Brand, Model and Wireless Chipset:
Code:
lspci
Output:
Code:
02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 06)
[Code]...
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May 2, 2010
My friend has 2 pcs, one connected to the internet and the other one used to connect (when he had windows installed) to the internet through the first one using internet sharing, now i installed ubuntu on both and the network between them has been created but it wont connect, the internet icons just animates for like a minute then says "wired internet disconnected" in other words it failed to connect.
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Dec 21, 2008
I just got a new desktop (the client) and hooked my "old" computer (the server) up to it with a crossover cable & NFS while I set up the new system.Unfortunately, while nfsd is running firefox cannot access the internet through ath0 -- the wifi card (NFS/rpc is on the ethernet card). Do I have to set up a proxy server (eg. squid) or is there a simpler solution?I don't need direct access to the net on the client. I just want to be able to use the wifi's IP in the server while it has a NFS client on eth0, so that firefox can work online.
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Jul 20, 2009
Recently, I had the courage of installing Fedora 11 on my laptop while risking of trashing my Windows XP. Fortunately, the installation went fine and windows and fedora seems to be working together. But I needed to reinstall Fedora because I didn't do the partitioning right. After that the problem arises. I couldn't connect to the wlan. The first installation it was working fine. Now I can't. I select the network, enter the password and then it just says "Disconnected" or something like that then nothing else happens. So I had to reinstall it again thinking I did something wrong on the installation. But still it wasn't working. But it seems to be working when I boot from the live cd. I must have messed up my network configuration.
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Mar 29, 2009
I've a desktop running Fedora 10 connected to the Internet via LAN. There's 3 network controllers in the desktop. One integrated to the motherboard and two additional. I would like to connect other computers (two laptops, one running fc9 and the other Window$ XP) to the Internet via the desktop. I googled the question and found out that I need to adjust thing called 'NAT'.
For that purpose I did the following:
iptables -t nat -A POSTROUTING -s 192.168.2.0/24 -j SNAT --to-source 192.168.*.*
where 192.168.*.* - is desktop' IP address. I want to use 192.168.2.0/24 as a network for laptops. I activated one of devices (eth1), gave it IP address:
ifconfig eth1 192.168.2.0/24
and connected f9 laptop to it.
On the laptop I activated eth0 with the same IP. The problem is: it doesn't work. I can't ping anything from the laptop except its own address (192.168.2.0).
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May 6, 2011
Unfortunately, when I try to install Debian off the DVD, the wireless gets disconnected right when it tells me to choose my method of connecting to the net. It then gives me three choices of connecting - wired, unknown, and wireless. I must be missing something, because when I choose wireless, it says it fails, and cannot find anything to connect to. I input the SSID and password manually and it says its not there. So I quit the install and go back to the desktop and reconnect no problems.
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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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Sep 20, 2010
Currently my office use a Cisco Firewall which will only allow the ANYCONNECT utility to do the vpn connection. I found a Linux utility (OpenConnect) which will do the same thing, but allow me more flexibility with my networking needs.What I ultimately would like to have is to have a switch that I can connect any network device into it and be connected to the office. IE (my IP Work Phone and Computer) Currently I have is a computer with fedora 13 and two network cards eth0 (home network - connected to a router) and eth1 which I would like to connect a switch to. OpenConnect communicates fine and I can see the work network from the Fedora machine. It creates a vpn0 tun/tap device and I don't know how to pass communication to/from the eth1 device.
Do I try to iptables the ports for the phone and services I need on the computer? Or do I build bridge; and If I do what am I bridging. I have tried making a bridge from eth1 to vpn0 which reply's with unsupported device or something like that.Unfortunately my network skills are bit limited and my office says "it can't be done". Their solution is for me to buy a ASA5505 (or something device) and have a static IP. I would have to make it work as my router and even then it will only DHCP 10 ip addresses; which will cause a shortage of IP addresses in the house.
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Jan 23, 2011
I was browsing the net very well and without any issues for the past 15 days since I installed FC14. Fantastic experience and then suddenly yesterday after nearly 2 hours of a smooth online session I lost internet connectiivity.At that point I noticed that the network icon on top was showing a red cross. After clicking on it I could NOT eth0. I specifically remember seeing it there before.I checked the cables and the setting to no avail and just could not get it back. Any idea what I should be doing to see eth0 in the connection?Also FYI I have been noticing this from day one since I installed FC14----When going through administration-->network-->One cannot see the red and GREEN activate button that I am used to seeing in FC9. In fc14 its greyed out. So I actually had to go and enter the /etc/init.d/network start command to change the status from inactivate to activate.Also the network manager does not seem to be managing eth01 as it does not appear as an entry in its console.
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May 2, 2010
Upgraded To Ubuntu 10.04 The Other Day. And when I first installed it everything worked great except for my sound card which I fixed. But there was no problem with connecting to my Router via an Ethernet cable. Then I updated the video card drivers, restarted my PC and it wouldn't connect. It would try over around 1-2 mins then tell me its disconnected. No green light activity on the router / network card either.
I've reinstalled fresh copies of Ubuntu a couple of times now, Hoping to get the default settings back. But nothing has worked since.
I looked around the net and found quite a few people had this problem on previous versions of Ubuntu but it would seem most of there fixes were for there Version, so it hasn't helped me.
Heres some info:
ifconfig:
I've tried all the various things from dhclient to ifup/ifdown etc etc.
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Aug 24, 2010
Trying to get the wired nic working so I can troubleshoot the wireless. I cannot get any kind of network activity. Been searching so I will post a little information that seems to be common with my situation.
lshw -C network
reveals:
WARNING: you should run this program as super-user.
*-network DISABLED
description: Ethernet interface
product: 82562EZ 10/100 Ethernet Controller
vendor: Intel Corporation
[code]....
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Sep 25, 2010
I have recently upgraded the ubuntu desktop edition from 8.04 to 10.04. after upgrading i cannot show my eth0 nic interface in the System > Preferences > Network connections----- wired tab. and i also not getting network indication in the top of the panel beside the date time indication. but i can access network and using internet with that lan card. i cant understad my eth0 is connected or unpluged..
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Jan 24, 2011
Since I installed ubuntu 10.04 I dont see my eth0 card in System->Preferences->Network _connections. Everything works fine but it puzzles me. In ifconfig iI just see the eth0, networking seems to be working fine, but it keeps puzzling me. Adding theinterface is no solution: add it and it doesnt show again
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Jul 21, 2011
I am using BSNL broadband ISP and I am able to get network on windows os but not on my ubuntu.( I have a dual boot). I see Auto eth0 connected from the notification but when i am pinging [URL]... it says unknown host.
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Feb 4, 2010
Im trying to setup multiple domU through the default bridge setup. I am able to access only one of them through the network at a time. If you ping one of the domU it works perfectly but you cannot ping any of the others until you stop pinging the one and even then it takes a bit before you can. Ive looked around for a while and seen similar problems but nothing ever seems quite the same. Im probably missing something really stupid. Or is this the way the bridge is supposed to behave? Do i need to use a routed virtual network?
[Code]....
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