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Thread: I can see wireless network but cannot connect

  1. #1
    Join Date
    Jan 2005
    Beans
    51

    I can see wireless network but cannot connect

    I've followed a number of threads here, and have finally gotten to the point where I can see my wireless network. But ...

    Although, in both wicd and wifi-radar, I can see my wireless network, I cannot connect to it.

    When I try to connect, in wicd I see this:

    Code:
    None: Obtaining IP address...
    dlink004: Obtaining IP address...
    When I use wifi-radar, I see:

    Code:
    Connected to None(IP address:None)
    and wifi-radar prints out the following in the window where I started it:

    Code:
    Listening on LPF/eth0/00:1b:38:11:07:70
    Sending on   LPF/eth0/00:1b:38:11:07:70
    Listening on LPF/wlan0/00:1b:9e:1f:99:4c
    Sending on   LPF/wlan0/00:1b:9e:1f:99:4c
    Sending on   Socket/fallback
    Stale pid file.  Removing
    Internet Systems Consortium DHCP Client V3.0.6
    Copyright 2004-2007 Internet Systems Consortium.
    All rights reserved.
    For info, please visit http://www.isc.org/sw/dhcp/
    
    Listening on LPF/wlan0/00:1b:9e:1f:99:4c
    Sending on   LPF/wlan0/00:1b:9e:1f:99:4c
    Sending on   Socket/fallback
    DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 8
    DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 8
    DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 15
    I'm using WPA Personal security on my wireless router. But, this problem occurs even when I configure my router as an unsecured wireless network.

    I have wpasupplicant installed.

    Is there something that I need to configure? If so what and how?

    - Dave

  2. #2
    Join Date
    Jan 2007
    Beans
    5,549

    Re: I can see wireless network but cannot connect

    mostly either DHCP is not enabled in your wifi router or you havent set your wlan adapter in ubuntu to accept ips automatically

  3. #3
    Join Date
    Jan 2005
    Beans
    51

    Re: I can see wireless network but cannot connect

    Quote Originally Posted by superprash2003 View Post
    mostly either DHCP is not enabled in your wifi router or you havent set your wlan adapter in ubuntu to accept ips automatically
    Thanks for help. That sounds like a good clue. My router is configured for DHCP, I'm pretty sure. When I use wifi-radar to connect, I see "Acquiring IP address" and then it times out.

    So, how do I set my wlan adapter in ubuntu to accept the ip address automatically? I searched the Web and found a page about how to do this in MS Windows, but nothing for Ubuntu Linux. I read the man page on ifconfig and iwconfig, but could not find anything that seemed relevant. Perhaps there something about this in your Web page:

    http://prash-babu.blogspot.com/

    But, I could not find it.

    So, how do I learn how to set my wlan adapter to do this?

    - Dave
    Last edited by dkuhlman; April 24th, 2008 at 10:02 PM.

  4. #4
    Join Date
    Jan 2007
    Beans
    5,549

    Re: I can see wireless network but cannot connect

    hey..go to system->administration->Network and select your WLAN card and click on properties.. and there set it to Automatically assign ip(DHCP)

  5. #5
    Join Date
    Jan 2005
    Beans
    51

    Re: I can see wireless network but cannot connect

    Quote Originally Posted by superprash2003 View Post
    hey..go to system->administration->Network and select your WLAN card and click on properties.. and there set it to Automatically assign ip(DHCP)
    Thanks for the suggestion. But ...

    In System->Administration->Network, my wireless connection is already configured with "Automatic configuration(DHCP)". And yet it still does not connect.

    In the console window where I started wifi-radar, it shows:

    Code:
    Sending on   Socket/fallback
    DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 4
    Is that a clue? I'll search for info on DHCPDISCOVER.

    I found this at Wikipedia:

    http://en.wikipedia.org/wiki/Dynamic...DHCP_discovery

    Needless to say, this is way deeper than I want to go. And, I don't see any more clues about what to do.

    I actually was able to connect, once. But, I had my ether net cable pluged in when I made the connection, then pulled out the cable, and the wireless connection still worked.

    I found this message about how to solve a similar problem on Fedora:

    http://http://suseforums.net/lofiver...hp/t26987.html

    but, there is no file /etc/sysconfig/wpa_supplicant on my system. There is a /etc/wpa_supplicant directory, but it contains two shell scripts. So, I don't know how to configure wpa_supplicant, other than the suggestion you've given me.

    I'll keep searching. And, I'm going to boot MS Windows again to make sure that my router is functioning.

    Thanks again for help. I apologize for rambling on. I'm trying to use this thread to document what I've tried.

    - Dave

  6. #6
    Join Date
    Feb 2008
    Beans
    17
    Distro
    Ubuntu 9.10 Karmic Koala

    Re: I can see wireless network but cannot connect

    you may have problems similar to mine here: http://ubuntuforums.org/showthread.php?t=765647

  7. #7
    Join Date
    Jan 2007
    Beans
    5,549

    Re: I can see wireless network but cannot connect

    instead of setting it to Automatically assign ip(DHCP) , just enter ip address manually and insert gateway ip as router ip.. now try pinging the router..

  8. #8
    Join Date
    Mar 2007
    Location
    Denver, CO
    Beans
    7,605
    Distro
    Ubuntu 12.04 Precise Pangolin

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