Ubuntu Networking :: DHCP Update Killed Internet Connection?
Jan 30, 2010
I've been connecting to the Internet via Ubuntu 8.10 on my Toshiba laptop fine for ages now, but today it has stopped working. Yesterday an update came through relating to DHCP and, like all other updates, I installed it. And now my laptop can see the wireless router but it cannot connect to the Internet. (As I always install the recommended Ubuntu updates I didn't look closely at exactly what the update said, but I did see DHCP in the title, so this is why I suspect my connection is now broken.) Or can anyone tell me how to undo yesterday's update? I really wish now that Ubuntu had a utility similar to Windows System Restore.
AMD 64 Upgrade to testing last night killed my internet connection. The lan works, I can ping the dns server from my IP, however no mail, browser possible. Is something in testing broken again?
I have tested several Linux Distros over the last weeks, and with all of them my DSL connection have been working out of the box (for intance Mandriva, Ubuntu, Mint). But it does not work on Dreamlinux, neither on Live CD or now where Dreamlinux is installed on my harddisk.
According to the guidelines provided by my Internet provider I need to use TCP/IP and activate DHCP. And make sure that PPPoE is not activated.
I see nowhere I can do this in Dreamlinux. In the controle panel i can run Wicd. Then I can chose to de-activate Wicd - this gives me an option of entering Adress, Networking mask, Gatway and Nameserver - for static ip it says - and this is the opposit of DHCP, right??
SO - what to do? Should I get a debian package or something? (Dreamlinux is using debian packages, as far as I could see)
How do I tell the shared connection that it has a static IP and that I dont want a DHCP on the network?Do I have to set up DHCP on the box with the shared connection, even if that box only runs DHCP for a single IP address being the eth0 that is shared?Or can I tell the shared connection that it has a static IP and still allow network manager to run the shared connection?Or should I specify static IP's for all clients and the shared network manager and install say firestarter on the gateway to run the NAT for the eth0 out to eth1.
I've set up a permanent DHCP lease for my MAC address. I did this hoping to resolve the fact that I share my Internet ADSL connection with my wife and my daughter (the latter a great bandwidth hog)!
I am a convert from Ubuntu (9.04 kept freezing on my laptop; when it did work, many packages it seemed were outdated--ie only Eclipse 3.2, rdesktop was messed up [and apparently is also in Fedora]), and I am having some trouble with getting my wireless working.I am running Fedora 11.First off, there is a problem when trying to connect when using DHCP. NetworkManager gets to the second green dot, and then after a short while I am given a message that the connection was disconnected.
Configuring the interface manually, not using DHCP, allows the connection to complete. However, the internet is very slow. There is a 15-30 sec delay before website loading actually commences, and then another delay each time an ad must be fetched from another server.How can I fix this delay? I know I have encountered it in earlier versions of Ubuntu, but I can't remember how I fixed it.About the rdesktop problem, if anyone is able to help [maybe I should post another thread?], the cursor color (the color of the pointer) is inverted---where it should be white it is black, and where it should be black it is white. I use rdesktop a lot to connect to my terminal server in my basement. Any idea how to fix it?
i'm realatively new to linux am just getting my head around the command line, any way my problem today is, my network connection and networkmanger program have been deleted/uninstalled after i did a system update. im running ubuntu 10.04 32 bit. I have run of some commands which should be able to tell you whats going on. at the moment i'm using a live ubuntu cd to gain net access.
so the question is How do i restore my network connection and get my networkmanager program back without a internet connection. (i can download stuff to a memory stick and do manual install) Hope someone can shed some light on this, i know this topic has been covered before although each case seems slightly different to mine.
I have two ubuntu systems. Both are not connected to any internet connection Both are not connected to any DHCP server. Both are connected to each other via simple 8 port switch.
Is it possible to share files between two ubuntu systems ?
I did search, but could not find a solution.Right I've installed Ubuntu Server 10.10 on an old machine, installed fine and the system is running. I have a windows 7 desktop that is connected to the internet via wireless. The desktop then has an ethernet connection which is shared to the ubuntu server. The network looks like this.
Modem > Router > Desktop > Switch > Ubuntu Server My problem here is that there appears to be no connection from the server to the desktop. The server cannot connect to the internet.
When i ifconfig the ubuntu machine shows.eth0 link encap:Ethernetinet address: 192.168.137.2 Bcast:192.168.137.255 Mask 255.255.255.0 However on the windows desktop (the machine sharing the internet) these are the details for the connection to ubuntu server.ip 169.254.170.50 mask 255.255.255.0
is this a dhcp problem? is my server configured wrong?
I just had the great pleasure of switching from standard DSL to BT infinity (fibre optics) which included switching my DSL Belkins router for a new cable BT home hub unfortunatly. My PS3 went online wirelessly fine, all our iPads/Pods/Phones went on ok wirelessly and 2 out of 3 wired Ubuntu 11.04 desktops went online ok. I also have a Macbook dual booting 11.04 but haven't tried it yet. The problem is my computer which is wired the same isn't working, I can get it to say connected sometimes and UbuntuOne did say it was updating a file but then cuts out, I just can't seem to get connected to the internet!
I didn't change anything from the previous day, just switched it on. The only significant difference I can think of between my computer and the other desktops is mine has the KDE desktop installed.
Things I've tried: - Restart router - Boot into different DE eg. normal, classic, KDE - Unplug ethernet cable and plug it back in - Restart computer
My computer is connected using the powerline system along with 1 of the other desktops so it can't be that, it must be something at my end.
Some data:Attached because on posting I get an error even though there is not a singel image or smiley:You have included 11 images in your message. You are limited to using 8 images so please go back and correct the problem and then continue again. Images include use of smilies, the BB code [img] tag and HTML <img> tags. The use of these is all subject to them being enabled by the administrator.Couldn't upload either it gives invalid file so I resort to Google docs now [URL]
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.
I had my laptop at work for a few days and when I brought it home I couldn't open up web pages any more. I have a DHCP connection (shaw cable).When I plug the chord from the modem into my windows machine I can open up web pages. When I plug it into my ubuntu laptop I can't open up web pages.
I have tried unplugging the modem and restaring my computer.I think that there is some sort of connection because when I open up Network tools it shows that I am continually receiving packets. As soon as I unplug the ethernet wire I stop receiving packets. For some reason I just can't open web pages.I also tryed typing 'sudo ifconfig' and 'sudo dhclient' in a terminal. I don't fully understand what this means but I saw it in another forum.
I have router and wireless card Linksys. Driver are installed correctly for wireless card.
Using WifiRadar I can see the access point is detected.
DHCP woks perfectly for wired lan.
However when I try to connect to the detected access point the ip addres is never retrieved and the connection never established.
I tried most of he basic instructions posted on ubuntu forums, but the problem doesn't seem to be with basic configuration: driver, essid, wep key, etc..
The problem seems to be with DHCP not able to retrieve an IP address from the DHCP server of the router. Of course the router works file with other laptops (windows based) that have wireless card.
I also tried the Network Connections setup part of ubuntu. That one shows the access point by its essid name in the list of wireless network, but when I try to connect it takes sometime and eventually asks for the wep key, which I provide and then it times out and keep asking it. The same wep key works for other pcs. Can't figure it out. I am using ubuntu 9.10.
Some more details are the following:
1) Here the output from the log file: /var/log/wifi-radar.log
Of course it is set ... and dhcp client works for wired lan anyway.
2) diego@mysuperlaptop:/var/run$ sudo iwlist wlan0 scan [sudo] password for diego:
I tried everything I could think about in the UI windows setting (WifiRadar and Wireless Network Connections) a well in the config files from the shell. I just don't get what the deal is. I am pretty sure it is a DHCP issue but can't figure out what.
I'm trying to share an internet connection between two computers. The one currently online is a HP Presario running Ubuntu 9.10, and connects through a wireless connection. It has an ethernet port, which I'm hoping to use to connect to a Dell Desktop running Windows XP pro SP 3. I'm hoping to make this happen one of two ways.
1. Without having to mess with any DHCP settings. Sadly, I live with my parents, and the router in their room uses DHCP and sets the addresses for all the computers on the network. My parents don't want me screwing with any of the settings on the router. is there a way to just have Ubuntu pass information from the ethernet connection to the wireless connection without having to deal with DHCP.
2. I'm sure this has been explained, but as I'm new to Ubuntu, I will pretty much need step by step instructions to do this part. Sorry to be difficult. Is there a way to have Ubuntu keep the current settings it has on the wireless side (let the router determine it's address and all of that good stuff), but have a DHCP server kick in on the hard-wired side so Internet Connection Sharing has an address to look for on the laptop?
I have a similar problem. My ubuntu box is set up as a dhcp router for my Xbox360, my xbox can get ip and DNS information from the computer, but it doesn't seem to get the right info. The ip address it gets assigned is out of the range I've set in etc/dhcp3/dhcpd.conf.
I have DHCP server running on CentOS-5.4.The dhcp version is 3.0.5 In the dhcpd.conf file I want to use "update-conflict-detection". But, when I add the line as
Code: update-conflict-detection false;
and after saving the file when I restart dhcpd, it fails. I read somewhere that dhcp version 3.1.x supports my requirement. Is it required to update dhcp? If yes, how can I update?
Since that time I moved to Archlinux and I love it. I do however run lubuntu live from a USB for my work PC. I am having a problem with it. I think it's okay to post here because the core of the system is still Ubuntu. I don't think LXDE is the problem. I start up the live environment and it says 'wired connection connected' but I can not load any pages or do anything.
I thought it may be a problem with configuration so I copied down (from Windows) the IP, Subnet, Gateway and DNS. I put them in manually and it doesn't say connected any more and still no connection at all. I am unsure what to do from here. I am not really familiar with Ubuntu enough to try much. I tried to 'dhcpcd eth0' but dhcpcd isn't installed. I guess the default Ubuntu network manager has dhcp enabled automatically.
I've been running 10.04 since it came out basically and my internet connection has been fine. After I got the last set of updates that came up on the update manager (which if I remember mainly contained an updated version of the latest kernel and a couple other files) my internet connection speed went from a decent browsing speed and file transfer speeds between 80-200kbps to an almost dialup browsing speed to file transfer speeds of a about 7.5kbps its very significant and very annoying it took 20 minutes just to make this post.
Also I've already tried changing my ipv6 settings.
I am an ubuntu user, and i have a problem ,since a couple of days i cannot conect to the internet in my home, i am a student an i live on campus, every time that i try to conect my computer from my linux partition the internet browser (every web browser, i have tried, explorer, chrome, chrominium,firefox and epiphany)show an error, it say that i need an upgrade for my web browser and ask me to download a file named as update.exe.But in my windows partition everithing goes perfect, even if i use the wireless conection from my college ubuntu doesnot show this problem.
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)
I'm still fairly new to Linux so please forgive me if my description of my problem leaves out important information. My problem is centered around using a AT91SAM9G45 development board (DB)on Fedora 10. I have directions on how to setup on my host machine a DHCP server to connect to the development board. I have installed an additional network card (eth1) that will be used exclusively to communicate with my DB.
The DB has been setup with an ethaddr=12:34:56:78:9a:bc and an ipaddr=192.168.251.191.
The following is info from ifconfig for eth1: eth1 Link encap:Ethernet HWaddr 00:0A:5E:1A:46:1C inet addr:192.168.251.190 Bcast:192.168.251.255 Mask:255.255.255.0 inet6 addr: fe80::20a:5eff:fe1a:461c/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:38 errors:0 dropped:0 overruns:0 frame:0
After a fresh installation my internet connection was working. but after yum update I am not able to connect to the internet. it is showing no internet connection.
I tried to download some software from the Ubuntu software center, and it does not download. It does not give me an error message, it just stays at 0 bytes. It eventually tells me to check my internet connection. (this does not make sense because I am using it to write this thread) I checked synaptic package manager for correct proxy settings and it was ok. I ran
Code: sudo apt-get update
but to no avail. I am using wireless, and recently dissembled the computer to disconnect the CMOS battery, but I think that it was put back together properly.
Not sure this right place for this. After updating from Ubuntu 10.04 to 10.10 lost internet connection - was instantaneous loss. Wired connection computer to router. Icon on computer shows "wired connection 'auto Eth0'active" The router shows line connected ok. Computer shows connection is established. Connection information menu shows details such as IP address broadcast address and other details. Where do I go from here to reconnect to internet.
I can access internet when my eth0 is set toDHCP client. But when I set static I can ping goole.com... but my Firefox browser doesn't connect to Interent!
I have a home network, with an OpenWrt router operating successfully as DHCP server (using DNSMasq). I'm planning to install LinuxMCE on my main fileserver and in order for this to properly detect devices around the home it requires that it is the DHCP server. That would be fine except that I sometimes power down the fileserver (eg. when my in-laws sleep in the spare room where the server lives) and that would leave me with no DHCP which creates problems (when my in-laws want to get their laptop connected to the internet).
One answer is to get new in-laws which would be OK except that I'm still pretty keen on my wife. Alternatively is there any way to set up a fallback DHCP server ie. the router would check if there's a functioning DHCP server on the network (ie. the fileserver) and if it gets no response it will serve DHCP addresses itself.
