Fedora Networking :: Wired Connections - Shutting Down Loopback Interface
Jun 22, 2010
I have a problem with my F13 and wired connections on my Acer TravelMate 2410. When I connect the inet cable it doesn't show it as connected. When I type ifconfig, it shows everything as it should. When I tried to bring up eth0 with ifup eth0, it said that the device is not managed by NetworkManager. I tried to restart nm with service network restart, but it gave this error:
Shutting down loopback interface: Error org.freedesktop.NetworkManagerSettings.InvalidConn ection: ifcfg file ;/etc/sysconfig/network-scripts/ifcfg-lo' unknown
The same error came up for eth0 and Wired_connection_1 (the connection I configured from NM )
When I typed nmcli dev list it gave me:
GENERAL.DEVICE: wlan0
GENERAL.TYPE: 802-11-wireless
GENERAL.DRIVER: ath5k
GENERAL.HWADDR: 00:14:A4:4D:B8:FC
GENERAL.STATE: disconnected
CAPABILITIES.CARRIER-DETECT: no
CAPABILITIES.SPEED: unknown
WIFI-PROPERTIES.WEP: yes
WIFI-PROPERTIES.WPA: yes
WIFI-PROPERTIES.WPA2: yes
WIFI-PROPERTIES.TKIP: yes
WIFI-PROPERTIES.CCMP: yes
GENERAL.DEVICE: eth0
GENERAL.TYPE: 802-3-ethernet
GENERAL.DRIVER: 8139too
GENERAL.HWADDR: 00:0a:E4:EB:32:E2
GENERAL.STATE: unavailable
CAPABILITIES.CARRIER-DETECT: yes
CAPABILITIES.SPEED: 10 Mb/s
WIRED-PROPERTIES.CARRIER: off
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Aug 22, 2010
I run a webserver Apache2, php5, and MySQL. They are all set up correctly and I can access my website at [URL] I have, also installed, noip2 to update my IP address to no-ip.com for my domain name. Here's the problem: I can access my website through that domain name on other computers, both on internet and on the same network. But I cannot access it from my own computer (using the domain name instead of localhost). I need to be able to access the domain name on my computer because some pages on my website have been defined as the address to my domain name and not localhost. I cannot change this to localhost because if I do then people outside cannot work the webpages correctly. I had the same troubles on Windows before and I simply enabled loopback connections by typing in my private IP address along with the domain name into the Windows hosts file. I use version 10.04.
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May 29, 2009
My current network setup at home is all wired, and that's worked for me so far. Now I want to set up a wireless connection on my Linux box that I can connect to with both my laptop and my Nintendo DS. I'd like to be able to host a wireless network from the Linux box, connect to it with some other wireless device, and have the wireless device communicate with the router, the internet, and other computers on the wired network. I have the wired network set up (statically configured) as eth0. Other network adapters present on the system are eth1 (not in use) and wlan0, wlan1, and wlan2 (identical cards, remnants from the last time I experimented with wireless).
So I guess my question comes in two parts:
1) How do I set up wlan0 such that it can host? Is Ad-hoc mode okay for this, or do I need to set it up in Master mode?
2) How do I forward connections between the wireless net and the router?
Note that I will be using WEP, as it is all that the NDS supports. I'd like to set up MAC filtering as well, but not until after I get something that works.
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Apr 20, 2010
I own an Ubuntu Server 9.04 on a remote dedicated server. Since a few days (?) the loopback interface is not 'up' on reboot : I only have eth0 (which works fine).Here is my /etc/networking/interfaces (did not change since server initialization):
# 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
[code]....
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Dec 14, 2010
I have a client's linux server where someone added a script which sends spam mails from the server's local loopback address (127.0.0.1) all my seniors worked on it and couldn't trace the script on the server this issue was going for a week, now I have an idea to bring down the loopback interface of that particular server(ya, that was not a permanent solution but just had an idea), but my support manager told that it will bring the whole server down(so far as i have learn't loopback address is used only for testing the NIC card's functionality), is that really bring the server down.?. How ever i tried this using a test machine all the connections works fine even after i bring down the loopback interface. As my client's server is a production server i can't test it there without clear knowledge, can any one help me out whether will it bring down the server or will it cause any side effects on it(i know that you guys are experts so i am asking it here)?
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Jul 22, 2011
I'm running Ubuntu 11.04 and I've been unable to access any type of Internet service besides web browsing. When I check on Network Tools, it's always set on Loopback Interface, regardless of whether I've just switched it to Ethernet Interface. I haven't been able to download system updates through Update Manager. I'm not very experienced with Ubuntu.
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May 17, 2011
I have a problem. I want interface to shut down once there is a link down state detected. If you set up eth0, and then plug cable out, eth0 stays up, just loosing the RUNNING flag. I want it to go down completely.
I've stumbled upon netplugd, and I've tried using it. It is a daemon that detects states in (link up) and out (link down) from kernel netlink interface. If I have this daemon up, it detects that link is down (eg. cable removed from interface), and it runs correctly /etc/netplug.d/netplug eth0 out. That script then runs ifdown eth0. And that's ok.
But very next moment netplugd runs /etc/netplug.d/netplug eth0 probe, and probe section of that script runs "ip link set eth0 up", which then turns interface back on!I've tried commenting out that line, but then new problem occurs - after the link is up, netplug cannot figure that out and bring back interface. Has anyone have this kind of problem, and any viable solution with netplug?
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May 17, 2010
Fresh install of UbuntuStudio 10.04. This is really bizarre.
I can't seem to connect to the wired connection mainly because there is no connections tab (pic attached).
Here's some printouts:
dmesg:
Code:
lshw -C network:
Code:
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Jul 8, 2010
New to ubuntu, my wired and wireless connection doesn't work.
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Dec 10, 2010
Running Ubuntu 10.10 on a Dell 710m. Fresh install of OS yesterday. Initially I had wired connection but no wireless. So I started chasing threads & trying different downloads & commands [WITHOUT KNOWING essentially what I was doing; throw your rocks at me HERE] & now I have lost the wired connection also.
Also:
[a] If I go into System > Administration > Additional Drivers, I get "No proprietary drivers are in use on this system."
[b] As far as being able to copy a downloaded driver [using a working M$oft machine with net connection] onto an SD card & transferring that driver to the Dell laptop, I have tried formatting 3 different SD cards with the Dell, & each time I come up with various failure errors--& I have no idea why something as simple as formatting an SD card isn't working.
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Jul 20, 2011
Just had an issue crop up where connecting wired network seems to stop wireless connections from getting an IP (happens on multiple networks both while the cable is plugged in and once it's been unplugged; also persists across reboots). Machine is a Dell Latitude 2120n with UnionFS running. Connection was working fine prior to the wired connection
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Mar 21, 2010
First I must say I love Ubuntu Netbook Remix. I purchased an Acus 1005HAB Eee PC last week and immediately installed UNR. The redesigned Applications menu is awesome. I've had a few bumps here and there, mainly with the internal mic (wanted to use Skype). In an attempt to get the internal mic working, I installed some of the linux-backports modules as instructed by some of the forum postings here. It seems as though installing the backports modules may have affected my network interfaces, as they now act funny after resuming from suspend. The wireless comes back, but just says "device not ready" (not worried about wireless right now). However, the wired interface won't come back at all after suspend. I must reboot the machine to get eth0 to be recognized.
I read through lots of forum posts about similar issues, but most of them had to do with the wireless interface, not the wired. I saw some posts talking about adding SUSPEND_MODULE instructions to some /etc/pam.d files, but I got the impression those were for NVidia network cards, not the internal cards present in the Eee PCs. I purged the linux-backports modules I had installed for Alsa (mic and speakers) and rebooted the machine, but still have the same problem so now I don't know if that's what caused it. Both wired and wireless were working flawlessly after resuming from a suspend when I first installed UNR, so I know it's possible!
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Jun 18, 2010
I've been working on a koala system, trying to set it up as a wireless AP with a pair of wired interfaces. The hardware itself is a small Nvidia ION platform with a built-in NIC and a bunch of USB ports, so I decided to set it up with a single wired USB NIC and a wireless USB NIC. For wired, I settled on a TrendNet TU2-ET100. Initially, this NIC worked perfectly on with no hackery required, plugged in and off it went, assigned as eth1 on the system.
For wireless, I've tried a couple of different units, both of which required use of the compat-wireless drivers to get recognized. I'm still having problems with that, but I'll deal with that later. In building and installing the compat-wireless drivers, it appears to have messed up the included drivers for my TrendNet USB NIC. Now when I boot the box, it comes up with the following error:
And from there, the NIC won't show up any longer - no eth1 visible in ifconfig -a. Clearly, some alternate driver (usbnet?) from compat-wireless has messed up the asix driver from being able to start up. Any ideas on how to get that restored?
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Jul 30, 2010
i'm currently travelling in across Japan and facing difficulties connecting to hotel's ethernet connections under ubuntu 10.0.4- when plugging in the ethernet cable nothing happens- rebooting doesn't change anything either.this wasn't a problem before, and i can connect to hotel's ethernet under windows 7 which i'm currently using to post this, but something doesn't work under ubuntu, which is now my main os.
staying at my inlaw's house for a while, i ran pppoeconf to use their optical fibre connection, which worked, but also seems to be the root of the problems i'm now facing to go online via ethernet elsewhere. it seems like pppoeconf disabled something.
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Aug 20, 2011
An half year ago i reinstalled ubuntu 10.04, there both were no wired and no wireless connections.I have found drivers and it's everything ok with wireless, but i can't connect through LAN.
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Apr 9, 2009
I have configured LVS under RHEL5. I need to configure static route to my VIP. Now, I used the following command to add route but reboot OS will flush the route.
# route add -host 192.168.11.55 dev lo:0
how to add static route for certain network via /etc/sysconfig/network-scripts/route-<device-name>. But I did not found that for host.
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Jun 22, 2011
I have two computers that have a direct ethernet wire between them. The interface is set to a static ip address on each side, and under control of the NetworkManager.
About 1/10 the time the interface does not start. The messages log file will show:
Jun 22 13:01:22 owl10 NetworkManager[601]: <info> (p6p1): carrier is OFF
Jun 22 13:01:22 owl10 NetworkManager[601]: <info> (p6p1): new Ethernet device (driver: 'r8169' ifindex: 2)
Jun 22 13:01:22 owl10 NetworkManager[601]: <info> (p6p1): exported as /org/freedesktop/NetworkManager/Devices/0
[Code].....
So, I imagine there is a race condition where both boxes wait for the other to start the interface.
My question: Is there anyway to force NetworkManager to bring up an interface even if there is no Carrier?
BTW, this problem started recently on Fedora 13 after some upgrades. We upgraded to the latest Fedora 15 to try and solve it, and it now appears more often than it did on Fedora 13.
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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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May 2, 2010
My connection manager shows wired connections and shows wireless as being disabled. here is some terminal info getting wireless going?
Here is a bunch of things I have tried and the results.
nixon@nixon-desktop:~$ sudo ifup wlan0
Ignoring unknown interface wlan0=wlan0.
nixon@nixon-desktop:~$ sudo ifdown wlan0
ifdown: interface wlan0 not configured
[Code].....
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Oct 12, 2010
Why does the loopback interface has such a high mtu? I get it that it needs to work out even large packets, which is logical but why this specific number? I can set the MTU even higher with the ip link command, so it's not a limitation of the variable used.
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Apr 10, 2011
I've been struggling with this a bit now, and I'm not sure what the problem is. I have a laptop with a BCM4401 Ethernet card as well as a BCM4311 Wireless card. The wireless card works great out of the box, I'm able to connect with it perfectly. The problem is the ethernet card. Here is the situation: The NetworkManager menu doesn't list "Wired Networks" at all (ie. it doesn't say "not managed", it just only lists Wireless networks) Going into Network Connections, there is an "Auto eth0" entry ifconfig shows eth0 (which I assume means NetworkManager isn't managing eth0) I have edited /etc/NetworkManager/nm-system-settings.conf to say managed=true I have edited /etc/network/interfaces to remove any mention of eth0 (all that's left is the "lo" lines) So I'm not sure why eth0 is still showing up when I run ifconfig, and why Network Manager is not managing it. Any ideas?
Edit: Not sure what I did but now ifconfig spits out this:
Code:
eth0 Link encap:Ethernet HWaddr 00:1c:26:2c:60:75
inet addr:10.0.1.12 Bcast:10.0.1.255 Mask:255.255.255.0
inet6 addr: fe80::21c:26ff:fe2c:6075/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
[Code]...
The MAC address of the "Auto eth0" entry is 00:1C:23:8F:D4:39, the same as the eth1 entry that ifconfig spits out.
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May 17, 2011
I'm trying to bridge connections between a wired and a wireless connection in one of my computers. I was told it was impossible due to low-level limitations in the wireless subsystem, but apparently theres a way if you somehow forward packets from one port to the other. Is there a way I can achieve this?
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Jun 18, 2014
I need to share internet connection through wired-ethernet with another computer which does not have a wifi card.
However, no eth* interface shows up on ifconfig. Even more surprinsingly, neither lshw nor lspci shows anything related to wired ethernet controller/adapter:
Code: Select alllshw -C network
*-network
description: Wireless interface
product: WiFi Link 5100
vendor: Intel Corporation
physical id: 0
bus info: pci@0000:03:00.0
logical name: wlan2
[Code[ ....
Why isn't my laptop's wired ethernet not showing? I have a Toshiba Satellite PSAG8U-04001W.
The installation of Debian wasn't originally on this system: it was on an older laptop whose motherboard fried, so I rescued the hard drive as well as the Debian installation. However, I doubt this should have anything to do with lspci not even detecting the wired eth controller.
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Oct 27, 2010
I want my netbook to connect automatically to both the office wired/static network and to the usual wired/DHCP networks.
wicd is wicked but netsearching hasn't revealed how to configure it for both wired/static and wired/DHCP except by manually switching profiles.
wicd's profiles can use pre/post(dis)connect scripts but I don't know how to integrate them into wicd when they are upping/downing connections on cable (un)plugging.
If it is not practical to solve this within wicd, I'll explore standalone scripts to configure eth0 on cable (un)plugging, as detected by ifplugd.
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May 30, 2011
I recently installed Fedora 15 now, and during installation I set the internet connection manually, then did update and after reboot, the internet connection settings have been removed. Now I can not set because the network connection to the Internet Connection is inactive. I mention that before the update was functional internet connection.
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Jan 16, 2011
I just want to use Internet Connection Sharing (ICS) to connect to the internet. I have done a massive amount of troubleshooting, but some of it seems to contradict itself, and the only two things that I know for sure are that it used to work, and that my Ethernet cable is not the problem. When I use Terminal utilities like ifup and dhclient it seems that it can not determine IP information, but when I try to put it in manually, the "Apply" button grays out right after I finish typing it in. When I try to connect normally, in KDE or GNOME, the icon acts like it's connecting, then instead of having the connected icon, I receive a notification that "the network has been disconnected", and it goes back to the disconnected icon.
Oh, and by the way, I know that I could probably find a workaround, but I have limited resources, and this used to work. The Linux is a Dell desktop with Fedora 12 and the Windows is a Windows 7 HP laptop.EDIT: I hope that I didn't mess something up, but I accidentally used system-network-config to try putting in the IP address there, and ended up changing it back to the original settings, but the computer is now calling it Auto Ethernet in the taskbar icon, although sudo iwconfig in the terminal still calls it eth0.
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Jan 27, 2011
I just installed Fedora 14 in a hard disk of my PC. I installed MySQL also. I dontt know if this is the correct site for my question, but nobody MySQL related, have an answer yet. For MySQL accepting remote connections, my.cnf file must be edited (bind-address line or skip-networking line in that file). Well, that file in my Fedora-MySQL installation does not have such lines, so i assume, TCP/IP connections are allowed in MySQL. When i try to connect to the MySQL server it refuses the connection with the error 2003, that in short, means no TCP/IP connections are allowed. I disabled the firewall and retried but with no success, enabled the firewall again, and nothing happen. Is Fedora not accepting TCP/IP connections?
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Nov 22, 2010
The concepts of pseudodevice and loopback device ?
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Jan 13, 2010
I have two ethernet card on my computer, I want to make a TCP or UDP communication between these two cards, so I disable loopback: #ifconfig lo down. but with out loopback I can't even ping an eth from another one. how should I do? I want traffic to really pass eth cards.
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Feb 15, 2011
I have a server application that uses loopback addresses to open servers on linux machine.
For IPv4 with one line of configuration I can open many servers according to the mask I use for example with 10.10.10.0/24 I can open 254 servers.
How can I do the same for IPv6 ? I am able to add loopback interfaces but only for one host. Is it possible to add for a subnet ?
If not what is the max number of addresses that I can add ?
I also saw that it add the address only to loopback lo and I can add it to lo:3 for example.
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