Ubuntu Networking :: Can't Get Connection For Second Ethernet Card
Jun 6, 2010
I'm trying to set up a shared Internet connection that had been broken by a previous update, I believe. Eth0 is connected to the Internet, whereas eth2 should be the connection going to my Roku set-top box. Under the nm-applet icon, an entry exists for "Auto eth0" for the first card, but there is nothing under the second card except "disconnected". How do I make a connection entry under my eth2 card so that I can share my Internet connection with my Roku box?
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Feb 11, 2009
I have a very strange problem with my Linux Router/Firewall machine where i keep losing my connection on the ethernet card.
I have installed a Debian 4 distro on a PC with 2 nics to create a router/firewall machine. On nic-1 i have connected the ADSL modem and on nic-2 a laptop for testing.
What i want is to build a DMZ with public IP addresses assigned to the servers in DMZ.
Schematic example:
Code:
We have a total of 16 Public IP's assigned to the ADSL modem from our ISP configured in routering mode. Unfortunately our new ISP does not support Bridge mode, otherwise i would not have this problem. (we had modem in bridge mode working fine with our old ISP, but they have stopped so we were forced to switch to another ISP. eth1 and eth2 both have public IP addresses from the modem set hardcoded in the /etc/network/interfaces on Linux pc and on my testlaptop in the DMZ (server-1) i have set another public IP (they all fall in the same network range) I have enabled IP forwarding on Linux router/firewall and for testing the firewall is set to allow all traffic.
When i try to ping the testlaptop in my DMZ from a remote machine outside in our datacenter i get no reply.
However when i run the following command: ip addr add xx.xx.xx.xx dev eth1 to assign the public IP i have chosen for the laptop to the inner nic (eth2) and then try to ping the testlaptop again from the remote machine it still does not reply ... but (and here is the most bizar thing)...
When i then run the following command: ip addr del xx.xx.xx.xx dev eth1 (where xx.xx.xx.xx is the ip of the testlaptop) and try to ping again from the remote machine then it seems to be working fine ... however only for a short time because then connection is lost somehow.
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Oct 2, 2010
I installed 10.3 (after buying it a couple of years ago and letting sit on the shelf) and can't get it to configure my ethernet connection or my wireless card. Yast doesn't include a list of available cards, and the error I get in installation-network setup is that the kernel isn't present. The machine I'm installing this on is a Lenovo, in which there isn't a discrete ethernet card (it's in the motherboard), but my wireless card (a Cisco LINKSYS 802.11G) is a discrete card. Because I'm divorcing Microsoft for a number of valid reasons, I don't have Windows available on that box.
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Dec 4, 2010
Just installed Fedora 14 from the Live CD i686 on my Dell Inspiron 1521. I can't connect to the SpeedTouch 585 on either wireless broadcom card or the wired Ethernet card.
I can connect to it from the same Laptop on the Vista which is on dual boot on the same laptop.
Further confusing is that I ran Fedora 14 and connected to another SpeedTouch today.
Already checked the Channel on the wireless nic and it's on the same one as the SpeedTouch.
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Apr 4, 2010
how to use a ethernet conenction(Marvell Yukon 88E8039 PCI-E Fast Ethernet Controller )in ubuntu...my internet requires user name and password ..can u even tell me how to config the user name and password
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May 11, 2010
I installed 10.04 today, and I can't get any connection through the LAN. I've tried some stuff on my own, but I've been unsuccessful so far. It's not a hardware or connection issue, as it works perfectly fine in Windows 7. I haven't had this issue in any previous version of Ubuntu (or any Linux distro for that matter).The weirdest part is I booted from the installation CD as as LiveCD, and everything worked perfectly fine. It only stops working after I actually install it. Here's the results of ifconfig:
eth0 Link encap:Ethernet HWaddr 00:17:31:d8:d5:76
inet6 addr: fe80::217:31ff:fed8:d576/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
[code]....
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Dec 3, 2010
I have brought a new DELL INSPIRON 1410. I installed ubuntu 10.04 but my ethernet card is not getting detected where as in windows 7 is working..
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Feb 8, 2011
I am basically wanting to use my Ubuntu 10.10 computer as a router. Note: Before you say just get a router please note that I am poor/cheap. I have two ethernet connections and one wireless connection on my netbook. I want to share the internet connection that is going into one of the ethernet cards through the other ethernet card and the wireless card.
DSL-->1sr Eth --> 2nd Eth (currently works)
DSL-->1sr Eth --> Wireless Card (Adhoc) <--(connects with limited connectivity AKA no internet)
The 2nd Ethernet card already has working internet, but when I connect to the Wireless card (through an Adhoc network), it cannot get an IP (I believe).
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Feb 13, 2010
i shut down my ubuntu karmic for a bit. turned it back on after an hour or so and now i have no network connection. i checked all the obvious things like cords etc wife's computer is connected through the same router / modem and no probs here.i even replaced the card in mine.
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May 3, 2010
I just upgraded to 10.04. I had wireless connection for 1 day and now nothing. No ethernet connection either. I CAN use both wireless and ethernet using my machine on Windows.....so the connection stuff does work. Here's the output of of the commands I got from the "sticky". I can't display the output as this forum puts it all together as one continuous sentence with no line break!
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Jul 27, 2011
When I start my Ubuntu machine, it says "eth0 connection established". But i could not able to ping to other machines available in LAN & also to Internet.
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Jul 23, 2010
i've just got a new broadband/wireless connection from Virgin Media and am trying to get this very old laptop online. in the past, cable connections have been easy, and wireless has given issues, but this time its the opposite. so, i have a new cable connection that is all plugged in. called customer support, they have no support for linux as usual, but they 'manually activated' the modem and thats all they can do. i am not trying to setup the wireless network yet, i'll do that with a pc later, for now i just want to plug in and go. on Network Settings, i have set the wired connection to dhcp. thats what i've done before ... not sure if i need to get static addresses from the ISP? i can go online now using the erratic but generous neighborhood free wireless.
ifconfig -a gives:
Code:
ath0 Link encap:Ethernet HWaddr 00:14:A4:1E:3E:65
inet addr:192.168.1.66 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::214:a4ff:fe1e:3e65/64 Scope:Link
[code]....
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Apr 24, 2010
can one ethernet card support multiple ip address? but i think it's very dangerous. if bad guy take many ip, other people can't get ip. "does one ethernet card take multiple real ip or multiple virtual ip(one real ip)?" if it takes multiple real ip, then how it works good?..
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May 6, 2010
I own a D-Link DI-604 wired router and I've started getting some issues after Ubuntu 9.10 to 10.04 upgrade(Ubuntu 9.04 used to work OK!). The problem is that Ubuntu recognizes all my ethernet cards (see below), but I can only connect to the internet through eth1 not eth0 (which is my Windows default). If I try to plug the cable in eth0 nothing happens (at least not in Ubuntu 10.04 and 9.10).
Code:
lucas@lucas-desktop:~$ sudo lshw -C network
[sudo] password for lucas:
*-network:0
description: Ethernet interface
[code].....
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May 20, 2010
I have just installed a generic PCI ethernet card into a fairly low powered system (Celeron 766MHZ, 512mb Ram, 40 Gb HDD, Generic sound and video). The card came with no drivers. I have since installed Ubuntu 9.10, and up to a point everything is fine and looks great. However when I connect an ethernet cable up to the PCI card (in the hope of connecting with the Internet), nothing happens. I am thinking that I need Ubuntu drivers for the PCI card ? or does Ubuntu 9.10 come with drivers and I need to go into the 'engine room' to sort it all out ?
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Jul 2, 2010
I've had way too many problems with my network card under linux and I'm looking to buy a new one because the money is worth the lack of headaches. My project: I'm breathing new life into my old, old pentium 4 computer by running Kubuntu Server on it and using it as a little samba filedump.
So I don't want to spend a lot on an ethernet card -- this computer is no prize. I just want the cheapest, most out-of-the-box-compatible-with-no-configuration card I can buy.
I started on Newegg (sorted by price: [URL]....CE&PageSize=20 ), and I've heard that cards based on the RealTek 8129/8139 chip may be compatible/cheap but I can't seem to find out ahead of time what chip the cards are based on.
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Jul 18, 2010
I've set up 10.04 Server so that I could install directly to a command line, due to the fact that Desktop was crashing during the install every time. The installation goes fine, except for the networking portion. DHCP fails every time I try it. So I set up a static IP as an alternative. Once installation completes, none of the network-oriented tools (ping, telnet) work. I've tried pinging my router and I get 'Destination Host Unknown'. This is true if I change to a DHCP oriented setup as well.
The router sees that the machine is there, as indicated by the slowly blinking connection light meaning that it's hooked up to *something* but there's no activity. Also, networking did work within Windows before I nuked it, so I know it has the ability to operate correctly. I'm at a loss, mostly due to my own newness and ignorance of how to start tackling this within this environment.
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May 9, 2011
The on-board NIC on my machine died this morning, so I've just gone out and bought a replacement PCI card. The card has been recognised by Karmic, but it's not working. /var/log/messages says:
Code:
May 9 11:21:58 ian-desktop kernel: [ 2.082324] r8169 Gigabit Ethernet driver 2.3LK-NAPI loaded
May 9 11:21:58 ian-desktop kernel: [ 2.082334] r8169 0000:04:02.0: PCI INT A -> GSI 18 (level, low) -> IRQ 18
[Code]....
how I install the appropriate driver (noting that I have to sneakernet files across via usb stick), or any other diagnostics I should try?
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May 7, 2010
Following upgrading my 09.04 partition to 09.10 then 10.04, all was working fine until I tried hibernate out for the first time - big mistake! If I can get to a position where i can log on to the system, I find that my ethernet network connection is disabled and I cannot get it to restart. My 09.10 system still works ok. I am tempted to do a clean install of 10.04, even though I'll have to spend some time reloading the extra's and re-configuring.
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Jun 17, 2010
I just installed 10.04 on my new netbook and I am suprised to see that the ethernet is not recognized. When I run
Code:
ifconfig eth0
the result is
Code:
no such device
The machine was working fine before I installed Ubuntu. I am suprised to see this problem as I have already installed it on a few machines without any problem such as this.
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Jul 24, 2010
I have a HP Mini running Ubuntu Desktop 10.04, and I cannot get a wired connection to work. My network card is "Broadcom Corporation BCM4312 802.11b/g (rev 01)", and I have the restricted drivers for the card installed. Wireless works fine, though.
My /etc/network/interfaces:
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Sep 21, 2010
I am trying to run a cable from my wireless router over a 75ft cat6 cable to my bedroom. I don't get any connection on my end and I don't have any other ideas. I did setup a m0n0wall box just to try. I got the network led on my server to light up in my room but nothing more than that. Lastly, I tried adding a 5 port switch in my room and then connecting that to my server and nada.
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Aug 5, 2011
After some fiddling around, I have come to the conclusion my current wifi access point hates my other computer's Broadcom chip or the drivers thereof. So, my current idea is as follows. I would like to use my netbook to connect to the wireless network, and then connect my other computer to it through ethernet. My netbook is dual boot XP and Ubuntu (think Ubuntu is a version behind) and I would be fine to set up this sharing in either and just leave it on as a repeater station. My other computer is dual boot XP and Fedora and I would prefer this work to allow me to have network in both. I have a straight-through cable and have verified that my network card supports the automatic crossing over behavior.
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Feb 15, 2010
My ISP finished some 'upgrades' on its infrastructure. The result is that I am having great difficulty in connecting to the internet.
I have 3 operating systems on my box - XP, Fedora 8 and Feota 12.
I connect using an ethernet card, using dhcp. In fedora 12, the ethernet card is controlled be networkmanager. After the ISP completed their upgrades, I was not able to connect. I tried to connect manually using
Code:
There was an error message -
Code:
I read the advice here: [url], and removed all but the important lines.
But even after that neither ifup eth0 or dhclient eth0 works.
In fedora 8, the ethernet card is activated by ifup eth0 in /etc/rc.local. I was able to connect on a couple of occasions, but that too stopped working. I tried both ifup eth0, dhclient eth0, and tried to use the gui( which fires the dhclient command), but none worked.
When I use windows, it takes about 2 minutes to get an ip (earlier it was immediate). Sometimes that doesnt work and I have to click on "repair" whereupon it starts working.
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Sep 2, 2010
Tell me how to configure my Ethernet card to work. My pc only works wirelessly. I don't know what kind of Ethernet card is installed. I have Ubuntu 10.4 on a dell pc 1ghz, 20ghd, 512mb.
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May 19, 2009
i did configure as it was advised on [URL]... but it didn't work. for eg I added eth0:1 and eth0:2 on /etc/sysconfig/network-scripts/ when i do ifconfig i can see only eth0:1, i cannot see eth0:2, eventhough i configured as it was on the tutorial
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Mar 2, 2010
i already have an eth0 configured to automatically get its info from dhcp.
but i wanna configure eth1 to be able to serve dhcp and dns. i havent configured either dns or dhcp server on the server box since i have not configured the serving interface.
so far my interfaces file is:
Code:
# The loopback network interface
auto lo
iface lo inet loopback
# The primary network interface
auto eth0
iface eth0 inet dhcp
[Code]....
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Jun 8, 2010
With what command i can check whether my Ethernet card supports gigabit speed Ethernet or not?
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Nov 15, 2010
so, when i first got my laptop it came with vista and the ethernet worked fine, then when I decided to install Karmic about 9 months ago it still worked fine. After a while the update for lucid came out so I upgraded to that and then the ethernet started getting buggy. It would only work about half the time that i wanted it too and the other half of the time it would just stare at me and not move anywhere. So along with a couple other bugs I decided to format my harddrive and downgrade back to karmic and await the 10.10 release. unfortunatly my ethernet woes carried with me and they still would only show up on occasion. then about half way through my time with karmic round 2 it stopped altogether, and with the upgrade back to lucid it hasn't seemed to solve itself.
I ran through ifconfig -a, lspci and sudo ifup -a but they all tell me that the device doesn't exist.
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Jul 17, 2011
have a toshiba satellite L745 running Lucid Lynx I need drivers for the Atheros AR8151 ethernet card. Every post I have read on installing the driver give links to Atheros but they are all broken. Does anybody know where I can download driver?
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