Ubuntu Networking :: No Networking Interfaces Working
Jul 28, 2011
I installed the latest release of Kubuntu on to my dell laptop about 3 days ago, I fell asleep last night and woke up to my laptop not being connected to my wireless(it was when I fell asleep, it didnt reboot or anything overnight an dno one touched it), so I plugged in an ethernet cable and it still did not detect an internet connection, then finally it connected through my phones mobile internet via Usb.
However none of the built in networking devices are working, I have them all enabled.My WLAN Interface says "Unmanaged" and Networking interface complains the cable is unplugged even when it is not.I know you guys will need some additional info from me to help me.I just used my mobile broadband to install Wicd network manager but thats just a temporary fix, as it doesnt fix my ethernet issue and I want to be able to use the network manager itself to manage my networks.
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Feb 3, 2010
My network interaces stop working after 5-10 minutes of operation. I have 2 network cards, one static IP and the other dhcp. Sometimes I can ping my router, other times I can't.
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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"
Code:
ADVISEADDR:error in specifying interfaces: no existing ip interfaces found
#lspci
Code:
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
[code].....
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Apr 16, 2010
If I try to add a new interface (eth1) to /etc/network/interfaces, I get
Code:
* Reconfiguring network interfaces... SIOCSIFADDR: No such device
eth1: ERROR while getting interface flags: No such device
SIOCSIFNETMASK: No such device
[Code]...
How do I add 2 interfaces and get anyone of them to work, as available ?
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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:
Code:
/sbin/ifconfig eth0 172.16.3.108 netmask 255.255.0.0 broadcast 172.0.255.255
/sbin/ifconfig eth1 172.16.3.109 netmask 255.255.0.0 broadcast 172.0.255.255
/sbin/ifconfig eth2 172.16.3.1110 netmask 255.255.0.0 broadcast 172.0.255.255
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Mar 18, 2011
For some reason, i just cannot get my wireless to work in xubuntu. When i click on the network-manager applet, it only has the wired network tab and VPN connections, there are NO wireless networks displayed. I have also tried iwconfig, which returned
lo no wireless extensions.
eth0 no wireless extensions.
and lspci:
00:00.0 Host bridge: Intel Corporation Mobile 4 Series Chipset Memory Controller Hub (rev 07)
00:01.0 PCI bridge: Intel Corporation Mobile 4 Series Chipset PCI Express Graphics Port (rev 07)
00:1a.0 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #4 (rev 03)
[Code]...
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Jul 2, 2010
I'm on an embedded system that doesn't have Gnome, and I'm trying to startup networking automatically using /etc/network/interfaces. Here's what I have.
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eth0 comes up just fine. wlan0 comes up, but it's unable to acquire a DHCP address. I added the following lines to /etc/rc.local, and wlan0 comes up all the way, but I'm not too crazy about this hack.
[Code]....
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May 6, 2011
I'm testing some network setups, and bought two dirt-cheap USB network interfaces. My plan was to attach these two to an embedded device (sheevaplug) and mess with firewall setups. However, the two interfaces are absolutely identical; they have the same MAC, and lsusb -v is the same for both, line by line (except for device number, which tells the order the devices are plugged in, I believe?). Also, this is a single usb bus (single port, with a hub).
Now, obviously I can't make much of a firewall setup if I can't tell the interfaces apart. I realize I probably hit a brick wall, but does anyone have thoughts on this?
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Oct 31, 2010
What is the use of creating sub interfaces, for example eth0.1 etc. can someone please give an example of a situation where it would be useful
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Feb 6, 2011
I have a laptop "fura1" with two interfaces, eth0 (Ethernet) and eth1 (wifi), which I assign IPs 192.168.1.10 and 192.168.1.11 respectively. Then a desktop "fura2" with only one interface eth0 (Ethernet). Both are connected to a local network along with other appliances. My doubts arise on how to configure the /etc/hosts file of the desktop "fura2" taking in account that "fura1" has two interfaces, so two IP, but, obviously, only one hostname.
My first attempt for /etc/hosts of "fura2" was:
127.0.0.1localhost
127.0.1.1fura2
192.168.1.10 fura1 fura1.workgroup
192.168.1.11 fura1 fura1.workgroup
192.168.1.102 PDA PDA.workgroup
192.168.1.103 MT MT.workgroup
But it seems to my that assigning two different IPs to the same host is not a good solution. On the other hand, if I give different name to each interface, I will got a host with two hostname (?).
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Oct 16, 2010
I have two interfaces, gprs0 and gprs1, both connected to the Internet from the same HW device, but through two different access points I just read another blog entry with a guy who had two network cards, using one as a back up - I guess this is a little similar, but should be much easier I am guessing - I am just lost Using ifconfig (IP address given by the network) and route to setup the connection,
ifconfig gprs0 10.20.30.40 up
route add default dev gprs0
ping 66.102.7.99 works fine
afterwards
[code]....
There is data being transmitted and received to device again, I guess the kernel just doesn't know where the incoming data should go without the correct routing tables? Or what exactly is going on?The question I have is how do I configure the device to do the correct routing, using only the ifconfig and route commands? Maybe too trivial for you guys, but I am getting tired of goofing around not knowing what is up and down anymore
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Jan 16, 2010
I am currently trying to set up two network interfaces in my laptop. The wireless connection wlan0 works fine and it's the one that I use to connect the internet. It's in the range of 192.168.0.x/24 (gateway: 192.168.0.1). The wired interface eth0 is connect to another router (gateway: 10.0.0.13 with IPs in the range of 10.0.0.x/24. The router is set up to work as an AP and the 10.0.0.x network will only be used to control a robot, so no internet access will be required in this network. The problem is that when I have both connections up, I can't access the Internet anymore. I can still ping both routers, I can enter both routers configuration pages but I can't connect to the Internet. If I unplug the network cable, Internet gets accessible again.
I'm still a novice in linux and I can't figure out how to fix this. I don't want to get into static ip for the wireless connection since I'm constantly using the laptop in different places. The objective is to use the 10.0.0.x router to have a development platform for the robot that can be used anywhere without having to reconfigure the robot for a new network, which is a real pain.
In detail, the laptop connects via wireless to the network with intenet (192.168.0.x) and also connects via cable to another wireless router(10.0.0.x). The wireless connection of the second router is used to connect to the robot. Since I can ping both routers when they're both connected, I think it may be something related to the ip routes. I'm using Ubuntu 9.10 with kernel 2.6.31-17-generic
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Oct 17, 2010
For a very special project, many hardware issues, unusual limitations, etc, I'm turning my ubuntu into an access point (temporarily) by sharing the Internet from one device to another. I found out that with the devices I'm using, this can't be done with the network manager.
I need to get the internet from a device called 'tun0', to my 'wlan0', so it can broadcast it as a very special access point. I've read that there are ways to do this with the terminal.
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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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Apr 27, 2011
I installed Wireshark 1.2.7 on my Lenovo X61 tablet PC running Ubuntu 10.04 lucid during the quest for a decent signal strength meter for available wifi access points. What is a good software or hardware method to TEST WiFi strength & power?But I can't get Wireshark to do the simplest thing, which is to "Capture Interfaces".
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May 27, 2011
I accidentally killed the dhclient processes. I am unable to access the Internet wirelessly or with Ethernet. It's a little irritating because now I have to post this using my phone. I'm looking for a way to reformat the network files to how they looked when I first installed ubuntu. I don't know quite what these are, or really anything about it.
The /etc/network/interfaces file has the following information:
I'm pretty sure there's supposed to be more.
iwconfig typed into the terminal gives me this:
According to lshw, the logical name for my Ethernet interface is eth1. I think it used to be eth0. It's an 88E8055 PCI-E Gigabit Ethernet Controller.
The wireless interface has logical name wlan1. I think this used to be wlan0. It's a PRO/Wireless 3945ABG [Golan] Network Connection. The driver is iwl3945 - [phy0]
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Aug 4, 2010
I recently upgraded an Ubuntu 8.04 server to 10.04 server. My previous configuration had two network interfaces both routed to the same LAN with the same gateway. This functioned for me so as to support different services on each interface, such as http and smb on one, torrents on another. This routed fine in 8.04 (routing table below). Once I upgraded to 10.04, any packets that traveled beyond the LAN did not return. I checked and there is no local firewall running. Thinking that this was strange I set up a virtual machine and tested it in a different environment at work (and also with a virtual firewall configuration) with the same results.
I also tested several other current operating systems, including Debian 5.04 and Open Solaris 9, all of which routed two interfaces with the same gateway fine. I rolled back from 10.04 to 9.10 and the problem persists, so the change exits also between 8.04 and 9.10. at least identify what is unique to Unbuntu 9.10 and above that is preventing having two interfaces with the same gateway, something that other operating systems do not seem to have trouble with?
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Jun 24, 2011
I'm using Debian Squeeze with backports turned on and I've installed connman and it cannot see my wireless networking interface. I know my wireless card has a working driver because I have WICD on the same system and it connects just fine.I am using the Enlightenment desktop though and it only integrates with the connman wireless manager - so I would prefer to use this instead of WICD. Anyone have any ideas on how I can get connman working? What extra configuration needs to be done after installing?
I added my user to have the same permissions as root to the /etc/dbus-1/system.d/connman.conf file and I added my tiwlan0 to /etc/network/interfaces as a DHCP connection with no changes in functionality :-/. Been searching around online and reading man pages for the last couple days with no good results. Any input would be awesome!
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Apr 14, 2011
I am seeing an issue on a few servers where it doesn't appear all NICs in the 802.3ad lag are all operating at the same level. A few of the servers have two bonds each with two NICs in each bond.I have two NFS servers that each has 1 bond with 3 NICs.All are RHEL5 x64 2.6.18.I think the reason why I see one interface dominating RX and another dominating TX is due to the xmit_hash_policy but there are three hosts that use this particular server for network traffic.That's 3 different physical mac addresses.The layer2 algorithm should be fine in that situation I would think.Would I just be better off with balance-rr?
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Nov 20, 2010
I have two eth interfaces bridged in CentOS, one of these interface is connected to a Windows Server, I can do a ifconfig down on both these interfaces and there is no change of status at the windows side, I don't get the message that 'network cable has been unplugged'
Is this behavior normal ? I think when you shut an interface than you get the interface down message at other end ? And what becomes the status of the bridge if I shutdown one of its interface ?
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Mar 11, 2010
I would like a basic firewall on my netbook and first attempted this by using firestarter as i have no experience in writing IPTABLES rules from first principle and to be honest the syntax looks horrific! the problem with firestarted is that when i selected WLAN0 to be the internet connected port everything worked fine until i connected to a VPN at which nothing would work (the only error i got was when pinging an IP address when i got sendmsg not permitted) my normal setup is this.... normally im connected via WLAN0 to the internet. but one one particular network i must activate the VPN to use anything, this creates another interface tun0. both wlan0 and tun0 will be assigned an ip address but only the tun0 will do anything (the wlan0 one is configured by the network to just allow traffic to the vpn gateway and nothing else) what i really need is some way of creating a basic firewall (drop all incomming except ports i specify) that lives on wlan0 unless tun0 is active in which case it moves to tun0
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Apr 10, 2010
I have 2 interfaces (only one wan facing) with public ip addressing. when i nat to the outside network, inside routed networks work fine, but when i nat to the inside interface the routed networks no longer work. That is too say when I nat to an inside ip, I appear natted, and not routed, to routed ip. My question relates to iptables: How to I say 'nat everything but the routed networks'? I have found that -d ! x.routed.1.x/x works: but I would like to write the rule so that it says -d ! x.routed.1.x/x + x.routed.2.x/x
Nat outside, working routed net:
Code:
iptables -t nat -A POSTROUTING -i x.ouside.eth.x -s 192.x.x.x/x -j SNAT --to x.outside.eth.ip
This works and I get 1 routed network (I have to drop the -i to make it work - why?):
Code:
iptables -t nat -A POSTROUTING -s 192.x.x.x/x -d ! x.routed.1.x/x -j SNAT --to x.inside.eth.ip
I would like something like this:
Code:
iptables -t nat -A POSTROUTING -s 192.x.x.x/x -d ! x.routed.1.x/x + x.routed.2.x/x /
-j SNAT --to x.inside.eth.ip
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Jan 26, 2011
I change the interfaces file to activate the DHCP service for my eth0.
How do I make the service active without booting the system. In other word, how do I run the modified interfaces file?
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Jun 28, 2011
I have a UBUNTU server 10.04 LTS with 3 network interfaces (eth0,1,2) with eth0 is connected to my lan and others connected to two different ISPs , I am looking for a very flexible and complete monitoring tool which can monitor all of the traffic of incoming and outgoing of any interface and SPECIALLY can show me which local client made connection to which interface for connecting to internet in online mode not offline and it is good to have online web base interface I mean the interface shows the measured data in real time mode. I fount some tools like iftop and iptraf and many others in this url: http://www.ubuntugeek.com/bandwidth-...for-linux.html but non of them are suitable for my net I mean none of them have good web real time data and non of them shows "which local client made connection to which interface for connecting to internet".
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Feb 16, 2011
Is there a way to do multiple interfaces in tcpdump? I have found that when using "-i any", not all packets are captured (compared to "-i eth0" on a machine with only one interface). I need to monitor traffic on some machines with as many as 6 interfaces, and get these packets that "-i any" misses. When I give the "-i" option multiple times, it seems to only use the last one.
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Sep 29, 2010
I have installed Debian 5 and dident configure the network interfaces at installation.Now i am not able to connect to the internet through Ethernet or Wireless. How do i configure the interfaces after installation ?PS. the interfaces show up as "Not configured" in the network manager
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Jun 28, 2011
Is there a way to add the wireless network which has a WPA/WPA2/certificate + Peap+MsChap+user+password to /etc/network/interfaces? Am trying to do a bash script that asks user and password and dumps it with addition info such as Peap/Mschapv2/cert into /etc/network/interfaces so it could be automatically activated. Any Ideas? Am on ubuntu 10.04 - using the GUI network-manager it connects without any problem after adding the user/pass/cert/mschapv2/peap. But I wanted to be configured thru command line?
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Jan 20, 2010
DSL modem is a Speedstream 6520 router. All computers work fine via dhcp. I'm trying to setup a small server (print server, ssh & ftp servers). I understand enough of the software part of things to get it going, my problem is setting a static IP on the server box. Every time I set the IP in the /etc/network/interfaces file and reboot, I have no network connection. I can talk to the modem through the browser, but nothing beyond that, not even local computers.
/etc/network/interfaces
auto lo
iface lo inet loopback
auto eth0
iface eth0 inet static
address 192.168.254.202
network 192.168.254.0
netmask 255.255.255.0
gateway 192.168.254.254
ifconfig shows the .202 address, but box can't get to the outside world, and can't ssh into the box from a computer sitting next to it. If I let it dhcp, then I can ssh into it, and have access to the internet. In the modem, I have dmz set for that address. Wan address is static. I can ssh into it if I let it do dhcp, so I know it can work that far. But if I set static ip, I might as well pull the network cable. I've been beating my head on this for over a week, and I'm lost why I can't get it to work. I even changed the dhcp range on the modem, so the .202 is not in that range. There is no dhcp client installed that I can find. I'm using WattOS beta3, which is a light distro based on 9.04. The computer is an old Dell GX150, integrated nic. I have done ifdown and ifup eth0, still no happiness. Doesn't seem like it should be that hard, but I'm stumped. DMZ should let everything pass, so don't need to mess with port forwarding and such. I know it works using dhcp.
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May 6, 2010
I have 4 Ethernet Interfaces. I need Dynamic IP-Addresses for 2 Interfaces. Can anybody help me how can i achieve that
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Sep 18, 2010
When I create eth0:1 sub interface after restart it is not there anymore. how to properly set a new interface with ip address and make it permanent
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