Networking :: Detecting And Logging Lost Internet Connection?
Dec 8, 2010
We have an Asterisk machine that we suspect periodically loses internet connectivity, causing all calls to drop. First, would this sort of thing be logged anywhere out of the box? I haven't noticed anything in /var/log, but that doesn't mean it's not there. If this is not typically logged, how I might go about logging it? I'm currently running a bash script from cron every 5 or 10 minutes which pings Google and writes success or failure messages to a log file. This works fine for extended outages, but if the internet connection drops and comes back between cron runs, it won't be caught.
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Jan 23, 2010
I am running ubuntu 9.1 on a Dell Dimension 2400. After installing ubuntu on the pc, it was automatically recognizing my router and connecting to the internet fine via ethernet. Then, my roommate unplugged the router and it won't recognize it. I can't access my router settings, and ubuntu is recognizing it as "inactive" but every other computer in the apartment runs fine. My PC uses a broadcom ethernet controller, and my router is a Linksys wireless N.
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Jul 25, 2011
I was running 8.04 and my internet (Comcast) comes via a Motorola SB5100 cable modem then into a Netgear router then into my Dell. When I upgraded to 10.04 yesterday, I lost the wired connection. The wireless connection still works fine, but I have not been able to get a wired connection. Also, most online solutions reference the Network Manager, which is nowhere to be found.
Anyone have any solutions? I would be willing to revert to 8.04 if needed, as that worked fine, and obviously I quite regret the upgrade!
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Jun 16, 2011
I installed Fedora today, and I automatically had internet connection, I never had do configure anything myself. Then, I was playing around with VPN for a good while (trying to set up the VPN connection to my University), and now, I suddenly lost my connection to the internet!
But only Fedora can't connect anymore, the Windows PC has connection as well as my Mac OS X (I dualboot Linux on my MacBook). The Ethernet connection works as well, when I unplug the cable, Fedora gives me a message, but I just don't get into the internet!
Does anyone have an ides what I have to do? I don't know anything about network connections and I'm new to Linux...
I already restarted the Computer, but that didn't work, and Google didn't really held either.
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Mar 16, 2010
As I view it, Ubuntu has a great security risk in that it still allows internet access when the VPN connection has been lost, for whatever reason. As it is now, when the VPN connection fails you get bumped back to using your regular IP, and whatever you are doing becomes transparent to anyone watching. This is simply unacceptable for an allegedly secure platform. Does anyone know of a way to fix this with a script/program, or is there a distribution/OS that allows this? Windows re-dials the vpn automatically, but still allows internet access in the mean time.
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Nov 24, 2010
I am a non-techie, have been gratefully using Ubuntu 8.10 for a few years for the basics: email, web, documents, photos. I have somehow lost my internet connection, but strangely my email still works...!?!? My router is showing all the correct green lights, but I cannot get to any url. I am posting this thread via work (windows) pc. I have searched on this forum and in anticipation have done as much homework as possible, see below.I have a Netgear wired router. I cannot find Network manager on the menus and tried this from the terminal:
Code:
network-manager
bash: network-manager: command not found
networkmanager
[code]....
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Apr 23, 2011
I do have a problem with my internet connection at home, I've a Huawei router and ubuntu 10. When I connect to the internet whether wireless or wired I become able to surf the internet for less than 10 min then it cuts off! and to be able to surf it again I need to restart the whole system!
I used this command to restart the networking but in vain
Code:
sudo /etc/init.d/networking restart
On windows I do not face this problem with the same internet connection. I do not face it either when I'm using my campus wireless connections using ubuntu/windows!, so the problem is related to my home connection+ my OS.
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Apr 24, 2011
Like the title says, is there a way to restart the computer if the internet connection is lost?Is this possible on ubuntu?
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Apr 6, 2011
I have been using ubuntu netbook 10.10 on my Dell Mini 9 for the past few month without any problem; it connects wirelessly to the internet via a wireless router. Yesterday in the middle of web surfing, suddently firefox cannot see any website outside of my home network (Firefox displays Server not found page). No help when I rebooted a few times and connect to my home network via wireless or even wire cable; it can access files in my network file server (DNS-321) but not the internet. My desktop computer running Windows Vista and ASUS media player has no problem accessing the internet.
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Apr 18, 2011
After i install it i lost my internet connection . i got a message " Wired Network " " you work offline ". i use cable ADSL ,.... my Pc information HP Pavilion 6700 running with both Window 7 & Ubuntu 10.10 note... my network connection work correctly on W7.
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Aug 15, 2010
i installed ubuntu 10.04 in inspiron n4010 laptop. No internet connection is detecting. i have both wifi and wired network. in the desktop panel icon of network it shows networking is disabled ..
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May 28, 2011
have installed fedora 14 in my dell inspiron laptop and it is not detecting wi-fi of my college in fedora but in windows 7 it is detecting. how i can sort-out
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May 20, 2011
I played with the Network Settings section in YaST, because I wanted to use the wireless network card I installed into the PCI port. OpenSUSE recognised the type of card and its MAC number, and told me that I needed to install a firmware (fwcutter something). I tried some changes on the cable internet connection (like activate on plugged) while I tried to change the wireless connection (like activate on boot).
What I have now is that my cable internet connection is not working at all (it was working just 3 days ago), my wireless internet connection is, as always, not working either. I managed to work the wireless card on Windows XP by finding its drivers.
Since the problem is with my office computer, I cannot answer the exact brand names of the ethernet card and wireless card. Shall I reinstall OpenSUSE 11.3 from the DVD I have?
Second problem: OpenSUSE does not recognise my external harddisk, it gives an error about mounting the device.
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Feb 23, 2010
Somehow I lost Internet connection and tried various threads and still does not work.
When used the liveCD I can access Internet
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Jun 12, 2011
I'm running 10.10 and I uninstalled some files through synaptic and it also removed a lot of other packages which messed up my whole system. I lost the connection to the Internet and also the taskbar. I don't know how to re-install those lost packages because I have no net connection. How can I fix this? This is what I removed:
Completely removed the following packages:
apt-xapian-index
libboost-python-dev
python-xapian
[Code]...
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Nov 30, 2009
Three months ago my daughter went off to college with a new computer. I zapped her old system and successfully installed Ubuntu 9.04 from a CD. Everything worked fine including all the peripherals and the wireless internet connection. I was able to download and update applications without a hitch. Great system and so much cleaner and quicker than Win XP on the old machine. Then the system was shut down and lay idle for three months.When I fired it up a couple of days ago, all seemed normal except I could no longer access the internet even though the wireless network icon showed four or five bars. I first discovered the problem when I tried to update though Update Manager and noticed that 22 identified files could not be fetched. Neither Firefox, Skype nor Goodgle Earth can connect.
The router is a Linksys WRT54G router that connects to the computer through a Linksys WUSB54G USB network adapter. The router serves three other non-Linux computers without a problem, including one using the same model network adapter.I don't have much experience with Ubuntu, but this is some of the information I have been able to generate.
I tried a few of the recommendations found in other sites, but nothing seems to do the job. I am perplexed because everything was great until I shut down the system for three months and then started it up again. I appreciate any assistance and would be happy to provide additional information as requested.
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Jan 29, 2011
Using acer aspire one (ZG5) and have lost connection to Firefox browser after changing setting to make google my home default web page. I have no experience with linux so any help would be appreciated. There's no problem with my internet connection it shows connected.
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Oct 29, 2010
When I make a vpn connection to an openvpn server, I loose the internet connection.
The VPN works all right.
Server config (extract)
Client config
Client route without the VPN connection
client route with VPN connected (internet lost)
Is there anything I can do to the push rule of the servers's config file?
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Jun 21, 2010
After having updated unconditionally all packages in Kde-desktop-factory-repository to get the latest version 4.4.4, I can no longer connect to the Internet through Knetworkmanager. I receive the the following message from a pop-up window when clicking on the Knetworkmanager icon
Code: KNetworkManager cannot start because the installation is misconfigured.System DBUS policy does not allow it to provide user settings; contact your system administrator or distribution.KNetworkManager will not start automatically in future.I tried opening Knetworkmanager in a terminal as root user through 'su' but received the following message:
Code:# knetworkmanager knetworkmanager(2331): KUniqueApplication: Cannot find the D-Bus session server:"Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken."
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Feb 4, 2011
I have an Acer Aspire One Netbook that has lost connection with the Internet. On clicking the Browser button I get a message saying "Your wired device is now connected" - but nothing happens. It was working fine up till about a week ago. A substituted computer will work OK from the same output from the Router/ Modem through the same cable.
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Feb 14, 2011
I installed ubuntu 10 just yesterday. Everything was working just fine. The auto-update function advised me to download and install the latest updates and so I did. It was over 300 MB. I installed it, did a reboot and my internet connection was lost. I tried a few things I found on this forum yesterday. Nothing worked. I can go on-line on the same computer using windows 7. But I always have to reboot to try the different solutions. All right that's fixed! But now I just have to fix Firefox...
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Oct 28, 2010
I am writing a code in Python where a socket client changes data with the server. That works nice if the connection is up. However it is also supposed to work offline. So I need to be able to detect if the connection is up before sending data, but I was not able to do so. A summary of the code is like that:
Code:
try:
socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
socket.connect( (self.host, self.port) )
connected = True
except:
connected = False
if connected:
data = "some data byte"
try:
socket.send(data)
except:
connected=False
socket.close()
If I unplug the cable after the connection is ready then the socket sends data and does not detect the connection failure. What is amazing is that the client detects the connection failure just after the cable has been plugged again. Of course there is a loop in the code above and always that connected==False a new connection is made. How could the program detect the connection failure before sending data and then lead the code to an exception?
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Oct 14, 2010
last 6 months i was trying to connect internet on Ubuntu 10.04 yet i don't know how to connect internet i used mobile samsung s3310 with aircel
in windows its required hardware supporting software ,i dont know whether it's required for Ubuntu.
i followed instruction on ubuntu forum that is in
network manger->new connection->mobile broadband connection-> modem type (in that box is not enabled so i cant select my device)
->provider country(india) ->choose provider(Aircel)->billing plan(aircel prepaid ->APN is aircelgprs and dialup number is *99***1#)
->finally i did everything and applied but the network manger not showing any mobile broadband connection i am tired
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Jan 9, 2011
I am running Ubuntu 10.10, and I would like to use my computer to share the internet connection from an ethernet port. For example, I would like to set up my computer as a wireless access point so I can create a network that other computers can connect to for internet.
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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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Jun 22, 2009
I am currently working on a project related to packet sniffing which has been implemented using the concept of raw sockets. I am using C language.I am able to decode the following details from the packets received from a local network,like:
source and Destination Mac Address
source and Destination IP Address
source and Destination port no
But I am having trouble in decoding the domain name when an user in the local network is logging onto internet.For eg. if a user in the local network is trying to log on to web using his browser say if he has logged on to url then from the packet I need to get the following details
source Mac Address from which user had logged on
source IP Address from which user had logged on
domain name
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Oct 8, 2010
recently i have combined 2 machines into 1. after doing this, the ping to the new machine stops, for no apparent reason, and consequently all traffic to/from the machine also stops. when using the two machines individually this never happened.Lastly, if i restart the network, it kills everything (like the network just wont restart - it reaches the last interface and hangs), and if i reboot the machine, it seems to be fine for about 3-4hours.has anyone seen anything like this when connecting a large number of hosts to 1 gateway, using linux as the router?
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Aug 5, 2010
I used to be able to connect to the net using my laptop {Ubuntu 9.10 on Compaq nx7400.}by means of wi-fi . I do not know what I have done but I lost the facility to connect to the net.I noticed the Network Manager disappeared from the notification area. I manged to put it back. It detects the signal from the router and after entering my password it displays Connection Established but I still cannot access the net and does not load any web pages. I have the same Ubuntu 9.10 Desk on a memory stick, when I use it on the laptop it works fine.
I enclose a screenshot of iwconfig.I did sudo lshw -C network and it shows DISABLED. How do I enable it ? Are there any other info that I should supply and what and how.
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Dec 17, 2010
I recently bougt an Asus N61DA with Windows 7. I decided to install Ubuntu alongside Windows, so I made the Ubuntu CD, just like it said. Then I inserted the CD and restarted the computer. I started the installer (ubuntu 10.10 64-bit) and chose the option where it says "install ubuntu alongside other operating systems", or something like that. So, the installation started, but then I lost the internet connection, and the installation stopped.I re-connected the computer, but the installation still wouldn't continue. I restarted the computer and then nothing happened. I've restarted it several times, but still nothing happens. I've inserted the Windows recovery CD, but it doesn't work
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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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