Ubuntu Networking :: Cannot Obtain IP Address On Wireless Network?
Feb 19, 2010
I believe I have the wireless card installed properly and wicd sees the router. When I try to connect I get an error "can not obtain IP address" Output from iwcongif and lspci is.
dillan@dillan-desktop:~$ iwconfig
lo no wireless extensions.
eth0 no wireless extensions.
[code]....
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Mar 5, 2010
I'm using Ubuntu 9.10 and I recently changed certain settings of my router. After that ubuntu isnt able to obtain IP address from this wifi network. I've tried to connect with win 7 and OS X and both of the OSes are able to connect to the same wifi network. I tried to connect ubuntu to another wifi network at school and it connected successfully.
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Jan 17, 2010
I'm using Ubuntu 9.10 and for a while I had no problems connecting to the internet through the wireless network. But recently, my wireless connection started disconnecting regularly. Following an advice I found online, I installed linux-backports-modules-karmic, but after a reboot the wireless device stopped working altogether - it had lost its driver. Since then I managed to associate the device with Broadcom's STA driver, which I had been using before. But now, the wireless device cannot connect to the internet anymore. The network manager's output to /var/log/syslog indicates that the device cannot obtain an IP address. When I run code...
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Feb 24, 2010
I have an open WEP wireless internet connection with a security key. KNetworkManager can never obtain an IP address from my wireless router, but I know that the router works because Windows can connect correctly and Ubuntu's NetworkManager can connection correctly. Does anyone know what is happening? KNetworkManager just asks for my security again and again and again after it fails to connect.
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Mar 13, 2010
The IP address acquisition problem I reported earlier has returned, and I am stymied. To recap: Ubuntu 9.10 would not obtain an IP address via a wired Ethernet connection. I resolved the problem at the time by configuring eth0 in /etc/network/interfaces:
Code:
auto eth0
iface eth0 inet dhcp
and disabling Network Manager in Preferences > Startup Applications.After a powering down the PC today, the problem has returned. It appears that dhclient cannot obtain an IP address. This is true whether I am connected to the router (a Linksys WRT54G running Tomato), or directly to the DSL modem. When my usually wireless Ubuntu 9.10 laptop is wired to the router, it obtains an address almost instantly. I have made no changes to the network configuration since January. I have tried to keep current on Ubuntu updates.
Code:
jgb@alienware:~$ ifconfig eth0
eth0 Link encap:Ethernet HWaddr 00:30:1b:ac:5b:9e
inet6 addr: fe80::230:1bff:feac:5b9e/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
[code]...
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Nov 19, 2010
I just installed ubuntu 10.10 on my laptop Dell Inspiron 1525. Wireless internet is not working. I installed wicd network manager and I am able to see the available wireless networks. My wireless connection is encrypted. I have tried all encrypted options with the key but no avail. It says "Cannot obtain an IP address" after validating authentication.
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Nov 19, 2010
I just installed ubuntu 10.10 on my laptop Dell Inspiron 1525. Wireless internet is not working. I installed wicd network manager and I am able to see the available wireless networks. My wireless connection is encrypted. I have tried all encrypted options with the key but no avail. It says "Cannot obtain an IP address" after validating authentication.
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May 16, 2010
But i can under an alternate profile. Running ubuntu 10.04 and cannot seem to pin point the problem. When I was doing some looking into it, it appeared that the wpa-supplicant.conf wasn't where the man page indicated it should be. ie /etc/, but then it wouldn't or shouldn't work for the other profile either, right? i tried to post this before but i couldn't find it anywhere.
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Jan 30, 2010
I am having a persistent problem with getting a wired network connection under a recent install of Ubuntu 9.10. The network manager will show the wired network as 'disconnected' after a restart. This is true whether I am connected directly to my ISP's modem, or through the Linksys router that I usually use.The output of ifconfig suggests that eth0 is not being assigned an IP address:Code:I have reached the limits of my own ingenuity.
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Mar 12, 2010
I have just installed Ubuntu 9.10 (64 Bit) and I'm trying my best to get this Linksys WMP300N wireless adapter to work.I have searched and gone through a number of threads here with some level of progress but I still can not get this to work.Adapter info is BCM43XG [14e4:4329] rev 01I have installed driver bcmwl5.inf using ndiswrapper and ndisgtk.I had absolutely no success trying to use network manager applet so uninstalled it and went with Wicd instead which at least sees my SSID network with a strong signal.My network is encrypted using WPA and I entered the passphrase which seems to pass authentication but it keeps trying to get an IP address until finally it just tosses a failed message.I feel as though I'm really close but it just won't connect.
iwconfig
lo no wireless extensions.
eth0 no wireless extensions.
[code].....
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Feb 13, 2010
Running kubuntu karmic, kernel 2.6.31-19, on Asus EEE PC 1000.
WICD 1.7.0. hangs on "wired connection: obtaining ip address...". I have downgraded to 1.6.2 and 1.5.9, but this did not solve the issue.
WICD does work under other circumstances, e.g. wireless connection. (But at home I don't have wireless, but just the modem and ethernet.)
Same wired connection ethernet connection works flawlessly on laptop running Windows XP SP2.
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Sep 9, 2010
I'm using Ubuntu 9.10 on a Lenovo ThinkPad T61 using an Intel PRO/Wireless 3945ABG. My laptop's ability to connect to a wireless network stopped last night, and I'm not sure why. It's definitely something on my end, as my roommate can connect to the internet on a Windows box. I can wire in without a problem, but that's a pain and my Ethernet cable got lost in the shuffle when I moved back to school. I've been able to get into this network before and nothing about it has changed. I've been able to hibernate and restart and such and nothing has ever needed to be reset.
The router's a D-Link WBR-2310. Wicd and Network Manager see the network (I'm back to using wicd) , but wicd appears to get stuck at "Obtaining IP address..." and says "Unable to connect: Cannot obtain IP address". I know my password is correct (I set up the router and I'm the CS undergrad in the apartment so I manage it), lspci sees the wireless card, ifconfig and iwconfig return information about the interface, dmesg|grep wlan0 doesn't seem to have anything terribly out of the ordinary, but here's that output:
Code:
allyanncah@taliesin:~% dmesg | grep wlan0
[ 23.514202] ADDRCONF(NETDEV_UP): wlan0: link is not ready
[ 36.609016] ADDRCONF(NETDEV_UP): wlan0: link is not ready
[ 38.756143] wlan0: direct probe to AP 00:24:01:cb:4e:7e (try 1)
[ 38.758791] wlan0: direct probe responded
[ 38.758796] wlan0: authenticate with AP 00:24:01:cb:4e:7e (try 1)
[ 38.760587] wlan0: authenticated
[ 38.760609] wlan0: associate with AP 00:24:01:cb:4e:7e (try 1)
[ 38.763318] wlan0: RX AssocResp from 00:24:01:cb:4e:7e (capab=0x431 status=0 aid=1)
[ 38.763322] wlan0: associated
[ 38.765502] ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready .....
I've tried:
- reinstalling wicd
- uninstalling wicd and installing network-manager
- restarting
- shutting down and booting back up
- restarting the router
- sudo /etc/init.d/networking restart
- taking the interface down and back up with ifconfig
I haven't changed anything recently in regards to my wireless card, and all the fixes I've tried are things I've done before without an issue. The only thing I'm wondering about is if doing a hard reset might have broken something (I know this is a cardinal sin, but there's a whole 'nother problem I haven't been able to fix with the OS hanging every once in a while over a VPN daemon when it tries to shut down or restart -- I've left it for hours to see if it actually gets anywhere and no luck, won't do a soft reset). I'm nervous about reinstalling the driver just because I've never had to do it and drivers are a finicky business. I imagine there's a config error somewhere?
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Feb 12, 2009
I have installed Fedora 10 on my A860 Dell Vostrol Laptop with AR242X Atheros Wireless card. Wireless card worked out of the box and i could detect wireless network and connect to it. But i have a problem that, my wireless connection is not able to get IP address from the DHCP server. Please help me out what can i do to get this working. I am using WEP security and authentication is open system.
I have windows 7 beta installed on the same machine and on that wireless network works fine so i am sure that there is no problem with the wirless network. I am using DIR-300 router from D-LINK. I tried to see packet log on wireshark and there i see that there is no reply to the DHCP discover message. Actually i don't see any RX packets at all. Which is not normal as there is traffic on the network.
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May 24, 2010
I'm using a D-Link Xtreme N PCI express wireless adapter (DWA-556). It shows up in the network manager.
However it does not get an ip address from the DHCP server. Below is what I get in the messages log:
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Mar 19, 2010
though method of editing /etc/network/interfaces worked for me i have decided to get gui work.i have installed wicd, i set wep key for connecting to my network. when i'm scanning wicd find my network. but i get error "couldn't obtain ip address". when i dived into logs i found that there is some problem with wpa_supplicant. here is piece of log:
Code:
2010/03/19 21:45:58 :: Connecting to wireless network MY_ESSID
2010/03/19 21:45:59 :: /sbin/dhclient -r eth0
2010/03/19 21:45:59 :: ifconfig eth0 0.0.0.0
2010/03/19 21:45:59 :: /sbin/ip route flush dev eth0
2010/03/19 21:45:59 :: ifconfig eth0 down
[Code]...
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Feb 16, 2010
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.
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Feb 17, 2010
Linksys router and an acer aspire one. I have updated to the 9.10 netbook remix and the laptop associates with the router but will not pickup dhcp. If I specify an address then the machine looks like its connected but will not go to a website. I manually inserted dns but still nothing. So I updated to
linux-backports-modules-karmic-generic
linux-backports-modules-wireless-karmic-generic
Still will not use DHCP , I to am using ethernet at the moment. It was working before the update.
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Nov 7, 2010
I am having a problem getting a wireless network connection on my DELL laptop running CentOS 5. I have no problem getting a wireless connection when the laptop is booted in Windows XP. I also don't have a problem when booted under CentOS 5 and there is no authentication setup on the wireless router. I only have a problem when I setup authentication. The router wireless log shows the PC connectinng, authenticating, and succeeding authentication.I am using the Broadcom Hybrid-wl wireless driver.
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Feb 9, 2010
I just got a AWUS036H Alfa Network Adapter but there's like 10 folders on teh CD that it comes with, and there's read me's in about all 10 of'em, i have no damn idea which one to install. I went ahead and just did ifconfig wlan1 up and brought the interface up, went to wicd network manager and added wlan1 to wireless adapter
when i try connecting to my wireless router, it says resetting Ip ddress, something else with the configuration file, then obtaining IP address... it just hangs there for about 2-3 minutes and gives me an error... anyone else know how to set up this adapter?
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Dec 16, 2010
Version 10.04 LTS. Installed desktop version and network worked but I needed a static IP address and the install configures for a DHCP configured address. I tried changing to static address using the System->Preferences->Network Connections application but was unable to get the system to come up with the network up.
So I manually modified the /etc/network/interfaces and the /etc/resolv.conf files. I restart the system but when I do an ifconfig, I don't see a configured IP address on eth0 (only the loopback address). If I run /sbin/ifup eth0 everything then works fine and ifconfig shows the correct address bound to eth0.
My files are as follows:
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May 28, 2011
When I attempt to connect to a wireless network, the network manager asks me for the network's password, then says 'setting network address' for 20 or so seconds, then asks me for some random Hex or ASCII key in the same type of window I put the password in (Secrets for Noel -- KDE Daemon). Since a key is already typed into the window, I press OK, which then causes the network manager to go back to 'setting network address', then the window pops up again and keeps repeating itself.
I'm running Opensuse 11.4 with KDE, and my driver is ath9k. I don't know much about linux so please don't tell me to 'recompile this' or 'change this setting' without explaining how to do it. Please help, I've been unable to connect to wireless in OpenSUSE for 2 weeks now.
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Feb 25, 2010
I'm running an embedded Linux kernel, and I want to obtain a real memory address from user space. After goggeling a little, I found that the only way was to use mmap to access /dev/mem. But I never used mmap. I want to load a program in memory, in order to make it available from another processor, that has access to the DDR, but not to the flash memory where program is stored. Here is the code I use:
Code: // Open file and get its size
FILE* program = fopen(argv[3],"rb");
fseek(program, 0, SEEK_END);
long program_size = ftell(program);
fseek(program, 0, SEEK_SET);
// Prepare memory to copy it in
void* program_address = malloc(program_size+1);
FILE* memory_stream = fmemopen(program_real_address, program_size + 1, "wb");
[Code]....
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Jan 7, 2010
I just installed openSUSE dual-boot with windows. Wireless works fine on windows. Only ethernet works on openSUSE. At first, it couldn't even find my wireless network. With my friend's help we experimented and tried everything to find the driver for my broadcam4312 driver.
Later, my friend some update from the official openSUSE peeps... Then, the wireless could my network. I entered in my password and then hoped for the best but then it got stuck on the Obtaining IP Adress part. I know I got the rite password.
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Jan 11, 2011
Using CentOS 5.5, FreeRADIUS 2.1.7.
Objective is simply to be able to allow wireless clients access to my network based on their MAC address (I have about 10 WAPs around the country which I need to be able to manage user access centrally). Not interested in LDAP or dishing out keys/certificates etc.
I have been trying to follow the guide here. Sounds like it's exactly what I need but I'm not sure about a few things.
1) For each of the conf files am I supposed to be replacing everything currently existing in the respective file with what is suggested?
2) "raddb/modules/file" does not exist, so I assume I should use "raddb/modules/files"?
3) If I uncomment the line:
Code:
#rewrite_calling_station_id
under the "raddb/sites-available/default authorize{}" section, the radiusd startup gives me the following error:
/etc/raddb/sites-enabled/default[69]: Failed to find module "rewrite_calling_station_id".
If anyone familiar with FreeRADIUS 2 could answer these queries I might be on the right path
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Apr 8, 2011
I'm having making network/internet connection with my laptop. I have:Toshiba 1415 S173laptop
NetGear WG511T pcmcia card using madwifiNetGear WPNT511 pcmcia card using windows driver via ndiswrapperSlackware 12.2In both cases the card is recognized, and I can get a list of access points with iwlist.I can set the card to connect to the desired access point. I can use dhclient to get an ip address from the remote dhcp server. This works, the card is assigned a valid ip address on the desired network.Once I do this, however, I cannot access any network resources, no Internet, and no other devices on the network can see, ping, or access my laptop. It does this with with both cards, using madwifi or the windows driver via ndiswrapper.
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Jan 25, 2010
how to edit and save this file using Vim-noX. (connected via putty) I have the file loaded up and Ive inputed the needed data for my static IP, but I cant for the life of me figure out how to close and save my settings. At the bottom of the command line I have "INSERT" which toggles with "REPLACE" and I just cant figure this out.
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Aug 24, 2010
us robotics router, trying to access 192.168.2.1, worked on windows xp, just switched to lucidi have tried using both firefox and chrome, neither will access my router
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Aug 16, 2011
I'm running 64 bit openSUSE 11.4 with KDE. I would like to install Wi Fi Radar. where I can obtain the RPM for it? I have looked but can only find older versions of it for older versions of SUSE..
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Dec 11, 2009
I use getaddrinfo to get the ip address of the server, it works well on other 3 machines, but always get local address 127.0.0.1 on an 64 bit linux machine. Therefore, other remote clients can not connect to the socket server because the server binds local address l27.0.0.1.
I have also tried pass 0.0.0.0 to getaddrinfo, now the server bind on 0.0.0.0(all available interface). But now I can not print the correct network address of the server, as it is always 0.0.0.0 which is provided by getsockname.
I do not know how to get the network address of the server, rather than the local address.
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Jan 22, 2010
I'm connecting to my wireless, but I can't connect to the Internet, not even via an IP address.
(*) Can not open web pages via IP address.
(*) Can ping internal hardware no problem.
(*) I can connect to the Internet via Ethernet no problem.
(*) I used to be able to connect via wireless on this computer. No settings changed in the interim.
(*) Several other computers currently connected & accessing Internet via the same wireless - no problem.
(*) Based on other posts, I disabled the avahi daemon, but this had no effect.
Outputs of some commands:
[Code]...
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