Networking :: Identifying Where The Network Connection Is Being Cut-off From?
Feb 4, 2010
Starting from January, my Internet connection has become "unstable". I mean that I get occasional interruptions of the connection. This is particularly annoying while listening to a webradio or using voip. Of course, prior to January 2010, I could stay hours or days without interruptions. Now, I have to reconnect manually every 5 min to the service although the reconnection to the ISP is done immediately. So, before I take my axe and visit the office of my ISP, I would like identify where is that connection drop happening. Is it at my pc? at the ADSL modem/router? or the ISP? I use a wireless connection with WPA to my router. Then, the router is basically an ADSL modem. I am running Kubuntu locally. How can I follow up on the network status between different elements and see who is cutting off my connection?
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Dec 23, 2008
I boot linux off a USB stick on many different computers with different hardware. How can I determine in a script which devices eth0, eth1, wlan0 exist and which hardware devices they apply too? Sometimes a wireless card is wlan0, other times it is eth1 or even eth3! The proc/net/dev file does not inidicate which hardware is installed.
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Dec 12, 2009
following on from [URL] I was having a little think about how to make this concept more secure. its easy enough to separate known and unknown clients out via MAC address. but that system is easier to break than it is to set up either, sniff out a mac address already connected to the system, and spoof that address.or, more simply, set a static IP on your wifi device, and avoid the redirection completely. so, is anyone aware of a relatively straight forward setup that would allow me to identify clients on my network without relying on MAC address, would more forcefully separate out known and unknown hosts (vlan??). As well as doing so without alerting them to the fact, and without requiring known hosts to do anything special, or install software. Or requiring any more hardware than I have already. (hardware = a debian box with 2 NIC's acting as a gateway between all internal network, and the billion router which handles the outside world not getting in, and a WAP attached to the internal side of the network. also somewhere I have a wifi card that I could attach to the server to replace the AP) I assume some sort of authentication mechanism is required, but I dont know much more past that.
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Jul 9, 2010
I need to setup an Ubuntu Server to handle backups over the network (probably rsync over ssh). That server will then transfer the backup data offsite over a secondary external data line.How can I configure the ethernet interfaces to handle such a scenario?
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Sep 7, 2010
got the problem with multiple ssh-tunnels. The case is:I have 1 server running Slackware 13.0 with external ip and few windows-machines. inetd daemon is running on the server, my script is listening on port 2345. I create multiple ssh-tunnels from client machines to the 2345 port of the server in order to initiate script execution. For debugging reasons the script simply echoes the incoming information to the connection initiator. This is how the connection is initiated.
Code:
ssh <user>@<my_server_IP> -L 5555:<my_server_IP>:2345
echo "hello"|nc -vn 127.0.0.1 5555 (a port on a client-machine, that is forwarded to <my_server_IP>:2345)
gives "hello" output.
Code:
client1 port 5555|----ssh-tunnel---- eth0|-------server---------------|
[Code]...
The problem is that i need my script to execute some commands (registry parsing) on a remote client machine with winexe utility. So I need to identify each tunnel or each connection in order to execute the command on each of the client workstations. I need at least to have access to some ID of the ssh session or a tunnel, through which a certain connection was initiated and then use it to create a reverse tunnel or just connect to certain client via that client`s tunnel.
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Jan 24, 2010
Its a case of ".... wireless network connection active but still not internet connection .."I am using WEP - 128 key ... Works when I connect directly using ethernet cable ... but not wireless (pci and wireless router)
ubuadmin@ubucomputer:~$ ifconfig
wlan0 Link encap:Ethernet HWaddr 00:06:25:12:83:3b
inet addr:192.168.1.10 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::206:25ff:fe12:833b/64 Scope:Link[code].....
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Mar 2, 2011
I have installed qemu/kvm and created a Bridged network connection which works just fine(Windows 7 VM won't work in NAT mode.)
But when I try to use NetworkManager it says that I have no network connection because the network isn't managed, (I set the settings in ifcfg-br0 and ifcfg-eth0 to be managed)
The real problem is that now I can't use my VPN connections (I have many) in NetworkManager.
Is there a way to have both of these pieces of functionality?
I am using FC14
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Apr 3, 2010
I installed the driver for my network card. iwconfig and ifconfig are all responsive to connecting to the network, I'm given an access point address. Then, I try to connect to a website and no dice. ping www.google.com yields no result. What gives?
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Oct 12, 2009
I am losing network bandwidth and I am quite frankly I am not sure why, I don't have allot memory 495.6Mib
But I clean my PC every few days "BleachBit"
I have read some where on the magazine Network receiving suppose to be higher. so how can I fix this issue please i am having allot problems, u use cable from Comcast
I am not quite sure what Information you might need from me to give.
I use Ubuntu 8.04 LTS
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Jan 29, 2011
I have a Broadcom Corporation NetXtreme BCM5721 network card on my server at work.Everything works fine for a few weeks, then randomly the network connection on the server will stop working. After it stops working, I will try to reconnect with the network manager, it shows a wired connection available, it shows the "connection in progress"animation, then the "connection disabled" icon.
I uninstalled the network manager and used manual configuration, but do you think the network manager was the issue? I can't have the server disconnecting randomly every few weeks with no way to know what the real problem is. Was there an issue with the network manager with 10.04?
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Feb 9, 2010
I have 2 computer: 1 computer install ubuntu v9.10, in this computer already installed openssh-server and openssh-client, and 1 computer install windows. In computer with windows , i used putty connect to computer with ubuntu, but i can't connect. I don't understand what's error.
In the Putty , i configured:
IP : IP address of computer Ubuntu.
Port 22
Connection Type SSH
This is error: "Network Error: Software caused connection abort"
In computer with windows, i can ping computer with ubuntu and in computer with ubuntu i can ping computer with windows.
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May 14, 2010
I am trying to Setup citrix ICA client 9 on Ubuntu 9.04 Server. I installed it very easily and I am not getting any lib error also. But when I try to connect to the citrix server, it fails with a pop up saying "Error in Network Connection Network or Dialup connection may be preventing ......" This is driving me crazy from 3 days. My project is to check the feasiblity of a Linux desktop
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Oct 31, 2010
I have the "Work Offline" problem: when I boot up, the icon on the toolbar tells me I have "No network connection". This is not quite true, since I can access the first page of any website - only subsequent pages are inaccessible. I get a message saying that Firefox is offline. However, when I uncheck "Work Offline" in the File menu, it makes no difference to this behavior.
The problem is on my Ubuntu Dell desktop, which is connected to the internet with cable broadband via a D-Link router (wired connection). It has worked fine up till now. I use Ubuntu 10.04 and Firefox 3.6.11. I am writing this on my Ubuntu Dell laptop which is wired to the same router, so I assume the problem is not the router. I have tried various strategies suggested in threads on these forums, including editing about:config, changing "allow" to "deny" in some lines of /etc/dbus-1/system.d/NetworkManager.conf and changing from Automatic (DHCP) to Automatic (DHCP) Addresses only, but no luck so far. The contents of ifconfig are:
eth0
Link encap:Ethernet HWaddr 001:aa0:91:a7:51
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets: 0 errors: 0 dropped: 0 overruns: 0 carrier: 0
collisons: 0 txqueulen: 1000
RX bytes: 0 (0.0 B) TX bytes: 0 (0.0 B)
[Code]...
If I comment out "auto eth0" as well, it makes no difference. If I uncomment both lines ("auto eth0" and "iface eth0 inet dhcp") then I lose the internet connection altogether.
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Oct 21, 2010
I'm also new with linux i tried ubuntu and mandriva, and they worked fine out of the box.But I wanted to try Fedora because it looks great to my opinion.After installing it, everything worked fine, so I updated the system, and after the update my internet doesn't connect anymore, but it does see my wlan ssid. but it just keeps on asking my wpa key.... everytime.
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Feb 17, 2010
I have Ubuntu 9.10 installed. Been using it no problem for months. I have a Belkin wireless USB. Worked fine. Until 8 days ago. Just stopped working. During troubleshooting I also discovered that the wired connection also does not work. Rebooted, checked settings, did all that. Nothing. I've plugged the network wire into another machine. It picked up IP via DHCP within seconds proving that it's not the network. I've tried everything that I can think of. What would cause the network within Ubuntu to just stop working? Wired and wireless. The only thing I can think of doing now is to reinstall Ubuntu.
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Mar 17, 2010
I'm trying to setup network server for a week now and I was able to setup network in which i can ping the other workstation that is connected to my switch which is also connected to my server and I can also ping the server from local workstation.
I have 2 NIC, I use eth0 to dial to my dsl connection(ppp0 has the IP of my internet) and I use eth1 to connect to the switch and use to connect to the other local workstation
Now my problem is I don't know how can I share the internet connection from my eth0 or the ppp0 to my eth1 to the network, what do I need to be able to share the internet connection to the workstation that is connected to my switch.
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Apr 29, 2009
I have somehow made 2 internet connections on my fedora 10. one is system default, which doesn't work. so I usually login and select from the top panel to the other working one. how to choose it from a terminal? then I can do it from a remote terminal.
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May 11, 2009
Suddenly, for no reason apparent to me, on initial logon I don' t have an eth0 connection. I click on the Network Manager icon in the tray, and connect that way. But it would be nice if it connected automagically. How do I fix network to connect on 1st logon?
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Dec 3, 2009
i have no problem with DHCP Internet conection, when i set up to manual and manually imput an IP ADDRESS-NETMASK-GATEWAY y get local red but not Internet. Im i missing something, i cant find a guide for dummies.
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Jan 18, 2010
I installed Ubuntu 9.10 using the default setup (Gnome I think) and on my Gateway Notebook using a wireless connection. It appears to be working great and I can even see my Windows drives and network storage on my home office systems.I have also set it up to run my favorite Bible software on Windows running under VirtualBox. I then installed the KDE Desktop so that I can select either desktop when logging on.
However, once I am in the KDE desktop, I cannot connect to the internet. I have checked and double-checked and the wireless settings seem to be the same on both the Gnom and KDE Desktops but still no network or internet connection when using KDE. I might mention that I am using the 64 Bit version of Ubuntu.
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Jan 31, 2010
I am new to Ubuntu, and I have just installed version 9.10 on my desktop PC. I need to connect my computer to my home network. Right now, I have no connection and cannot detect any of the hardware when running Ubuntu. When I switch over to my Windows XP partition, everything works fine.
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Mar 5, 2010
Hi - I am new to Linux and Ubuntu so I have no idea how to fix or problem solve unfortunately I installed Ubuntu 9.10 from scratch recently on this laptop and all was good. I connected to my WIFI network no problem. It's WPA PSK encrypted, DHCP enabled. I just set it up in Network Manager and it was all fine. Then after a few days I installed a printer and some packages and updates via synaptics. The network connection started dropping after 20 mins or so. Only a reboot would restore it - auto connects at first, runs fine till it drops then never will reconnect. I posted on here, someone gave me some lines to put in a config file. I tried that. I didn't seem to help much, problem remained. Yesterday I checked for updates and there were a whole bunch so I just installed them all. Now I cannot connect at all. I have deleted and recreated the connection in Network Manager but it doesn't help. It tries to establish a connection but never achieves it. I am connecting to the internet now on the same laptop booted into Windows, so all the hardware is fine.
Can anyone who knows about ubuntu networking help? Do I need to do a complete reinstall? Seems a bit much, but it worked when I initially installed the OS. I want to like Ubuntu, but something as basic as connecting to the internet is pretty vital so reluctantly having to start using Windows again...
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May 1, 2010
I bought a pc with ubuntu 9.10 pre-installed today. Unfortunately there's a problem with the network connection, i.e. I don't have any. The mb is a Foxconn A74ML series with onboard LAN. I've switched cables with another PC and it didn't have any effect. The other PC is still connected to the internet and the new one is still not connected. How I can/should do to get a connection?
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May 18, 2010
I'm a complete beginner who just installed 10.04. I'm trying to follow guides to setup my internet connection, but I am completely unable to locate the Network Manager Icon. I have the notification area already, but there is no icon. I tried the instructions here
After inputting
nm-applet --sm-disable
It gave me:
** (nm-applet:1722): WARNING **: <WARN> constructor(): Couldn't initialize the D-Bus manager.
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May 27, 2010
I cannot seem to stop my computer from broadcasting an ad-hoc connection. I set it up using networkmanager, but now I cannot delete it. I searched Google and ubuntuforums for an answer, but no luck
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Jul 20, 2010
I just got my first laptop, an ASUS eee pc 1201n. It came with Windows 7, but i decided to load the latest version of Ubuntu Netbook Edition on it as well.Today when I tried to access the internet via my library's free wireless service I couldn't get Ubuntu to recognize any wireless connections. I checked with Windows 7 and several networks appeared, including my libraries, but Ubuntu was blank.
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Aug 10, 2010
How ubuntu 9.10 netbook is36 activate its network connection?
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Nov 10, 2010
Wondering if anyone can point me in the right direction to setup some form of network connection monitoring and logging?As Australia has CRAP broadband and ISP's utilize Peak & Off-Peak download limits I schedule downloads for my Off-Peak times. Well recently my connection drops out exactly when my off-peak time kicks in and requires my modem to be reset to re-establish my connection.
My ISP is denying they are doing this but I happens everyday now and is getting really frustrating. What I want to try and set up is some sort of monitoring to ping my ISP's default gateway so I can prove it drops at a specific time each day. I am sure there would be something I could configure in Ubuntu but I am a newbie to Ubuntu so don't really know how to achieve this.
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Nov 19, 2010
connect to wired LAN in ubuntu 10.04? I think I have specified the IP address and everything correctly. But it says no connectivity. In windows it says connected but I am unable to open any webpage.
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Jul 28, 2011
I installed Jolicloud OS with Windows XP before because Windows XP have too many virus to attachment to Internet so whenever I go on the internet, most of the link take us to random site so I just installed Jolicloud OS however, some reason, I don't like Jolicloud very much because it require to enter the user name and password to link Jolicloud so wasted my time to use it... Its cool but pointless.
So, I just realised Ubuntu also provided free Ubuntu OS for netbook. After I downloaded Ubuntu desktop 11.04 and installed the system (all the datas is now gone and only current OS is Ubuntu)So, once I installed it... The netbook seem running well and no problem however, there is a huge problem is wireless are not found so I can't even use the Internet!.This netbook only got wireless and nothing else to connect like cable (wired).
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