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Thread: Strange problem with WiFi after 11.3 kernel update

  1. #1
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    Default Strange problem with WiFi after 11.3 kernel update

    I've been happily using WiFi with my Samsung NC10 netbook, running 11.3. Today, I did zypper dup and a whole lot of stuff was installed, including a kernel update to 2.6.34.8-0.2 default (i686).

    Immediately after a reboot, I couldn't see the internet but i am able to get into the router (with the usual 192.168.0.1) so it would seem that the WiFi link is working but Firefox and Thunderbird can't see any servers. Very strange. I re-installed the WiFi card (Atheros AR5001) but no change. I think the relevant module is ath5k. Any ideas gratefully received!
    ......but when it comes to computers, I've forgotten more than I ever knew.

  2. #2
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    Default Re: Strange problem with WiFi after 11.3 kernel update

    On 05/01/2011 09:36 AM, petermcph wrote:
    >
    > I've been happily using WiFi with my Samsung NC10 netbook, running 11.3.
    > Today, I did zypper dup and a whole lot of stuff was installed,
    > including a kernel update to 2.6.34.8-0.2 default (i686).
    >
    > Immediately after a reboot, I couldn't see the internet but i am able
    > to get into the router (with the usual 192.168.0.1) so it would seem
    > that the WiFi link is working but Firefox and Thunderbird can't see any
    > servers. Very strange. I re-installed the WiFi card (Atheros AR5001) but
    > no change. I think the relevant module is ath5k. Any ideas gratefully
    > received!


    If "getting into the router" means that 'ping 192.168.0.1' works, then your
    routing may be messed up, or you have a DNS problem. Please post the output of
    the following:

    Code:
    ping -c 3 192.168.0.1
    ping -c 3 8.8.8.8
    /sbin/route -n
    cat /etc/resolv.conf
    ping -c 3 www.google.com

  3. #3
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    Default Re: Strange problem with WiFi after 11.3 kernel update

    Quote Originally Posted by petermcph View Post
    I've been happily using WiFi with my Samsung NC10 netbook, running 11.3. Today, I did zypper dup and a whole lot of stuff was installed, including a kernel update to 2.6.34.8-0.2 default (i686).

    Immediately after a reboot, I couldn't see the internet but i am able to get into the router (with the usual 192.168.0.1) so it would seem that the WiFi link is working but Firefox and Thunderbird can't see any servers. Very strange. I re-installed the WiFi card (Atheros AR5001) but no change. I think the relevant module is ath5k. Any ideas gratefully received!
    I have no better idea than to suggest you downgrade your kernel

  4. #4
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    Default Re: Strange problem with WiFi after 11.3 kernel update

    Hi lwfinger, thanks for your message. Here's the output.
    I notice when I compare the routing table (below) with the one from an ethernet-connected PC that there may be a line missing.
    If so, how do I modify the file please?

    peter@linux-mufg:~> ping -c 3 192.168.0.1
    PING 192.168.0.1 (192.168.0.1) 56(84) bytes of data.
    64 bytes from 192.168.0.1: icmp_seq=1 ttl=255 time=3.49 ms
    64 bytes from 192.168.0.1: icmp_seq=2 ttl=255 time=1.29 ms
    64 bytes from 192.168.0.1: icmp_seq=3 ttl=255 time=1.41 ms

    --- 192.168.0.1 ping statistics ---
    3 packets transmitted, 3 received, 0% packet loss, time 2003ms
    rtt min/avg/max/mdev = 1.296/2.069/3.499/1.012 ms

    peter@linux-mufg:~> ping -c 3 8.8.8.8
    connect: Network is unreachable

    peter@linux-mufg:~> /sbin/route -n
    Kernel IP routing table
    Destination Gateway Genmask Flags Metric Ref Use Iface
    192.168.0.0 0.0.0.0 255.255.255.0 U 0 0 0 wlan0
    169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 wlan0
    127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo

    peter@linux-mufg:~> cat /etc/resolv.conf
    ### /etc/resolv.conf file autogenerated by netconfig!
    #
    # Before you change this file manually, consider to define the
    # static DNS configuration using the following variables in the
    # /etc/sysconfig/network/config file:
    # NETCONFIG_DNS_STATIC_SEARCHLIST
    # NETCONFIG_DNS_STATIC_SERVERS
    # NETCONFIG_DNS_FORWARDER
    # or disable DNS configuration updates via netconfig by setting:
    # NETCONFIG_DNS_POLICY=''
    #
    # See also the netconfig(8) manual page and other documentation.
    #
    # Note: Manual change of this file disables netconfig too, but
    # may get lost when this file contains comments or empty lines
    # only, the netconfig settings are same with settings in this
    # file and in case of a "netconfig update -f" call.
    #
    ### Please remove (at least) this line when you modify the file!
    nameserver 192.168.0.1

    peter@linux-mufg:~> ping -c 3 Google
    connect: Network is unreachable
    peter@linux-mufg:~>
    ......but when it comes to computers, I've forgotten more than I ever knew.

  5. #5
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    Default Re: Strange problem with WiFi after 11.3 kernel update

    On 05/02/2011 04:06 AM, petermcph wrote:
    >
    > Hi lwfinger, thanks for your message. Here's the output.
    > I notice when I compare the routing table (below) with the one from an
    > ethernet-connected PC that there may be a line missing.
    > If so, how do I modify the file please?
    >
    > peter@linux-mufg:~> ping -c 3 192.168.0.1
    > PING 192.168.0.1 (192.168.0.1) 56(84) bytes of data.
    > 64 bytes from 192.168.0.1: icmp_seq=1 ttl=255 time=3.49 ms
    > 64 bytes from 192.168.0.1: icmp_seq=2 ttl=255 time=1.29 ms
    > 64 bytes from 192.168.0.1: icmp_seq=3 ttl=255 time=1.41 ms
    >
    > --- 192.168.0.1 ping statistics ---
    > 3 packets transmitted, 3 received, 0% packet loss, time 2003ms
    > rtt min/avg/max/mdev = 1.296/2.069/3.499/1.012 ms
    >
    > peter@linux-mufg:~> ping -c 3 8.8.8.8
    > connect: Network is unreachable
    >
    > peter@linux-mufg:~> /sbin/route -n
    > Kernel IP routing table
    > Destination Gateway Genmask Flags Metric Ref Use
    > Iface
    > 192.168.0.0 0.0.0.0 255.255.255.0 U 0 0 0
    > wlan0
    > 169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0
    > wlan0
    > 127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0
    > lo
    >
    > peter@linux-mufg:~> cat /etc/resolv.conf
    > ### /etc/resolv.conf file autogenerated by netconfig!
    > #
    > # Before you change this file manually, consider to define the
    > # static DNS configuration using the following variables in the
    > # /etc/sysconfig/network/config file:
    > # NETCONFIG_DNS_STATIC_SEARCHLIST
    > # NETCONFIG_DNS_STATIC_SERVERS
    > # NETCONFIG_DNS_FORWARDER
    > # or disable DNS configuration updates via netconfig by setting:
    > # NETCONFIG_DNS_POLICY=''
    > #
    > # See also the netconfig(8) manual page and other documentation.
    > #
    > # Note: Manual change of this file disables netconfig too, but
    > # may get lost when this file contains comments or empty lines
    > # only, the netconfig settings are same with settings in this
    > # file and in case of a "netconfig update -f" call.
    > #
    > ### Please remove (at least) this line when you modify the file!
    > nameserver 192.168.0.1
    >
    > peter@linux-mufg:~> ping -c 3 'Google' (http://www.google.com)
    > connect: Network is unreachable
    > peter@linux-mufg:~>


    You are indeed missing the default gateway line. Once you run the command below,
    it should work

    Code:
    sudo /sbin/route add default gw 192.168.0.1
    The table that you showed above has information on how to reach 192.168.0.X
    (Rule 1), but nothing else.

  6. #6
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    Default Re: Strange problem with WiFi after 11.3 kernel update

    Ah, magic - that's done the trick. And just in time, I'm going camping tomorrow for a few weeks - would have been lost without my trusty netbook.
    Many thanks, I'll make a note of the command for future use! I did poke around looking for information on commands but without knowing where to look, it could take a while.
    ......but when it comes to computers, I've forgotten more than I ever knew.

  7. #7
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    Default Re: Strange problem with WiFi after 11.3 kernel update

    On 05/02/2011 12:06 PM, petermcph wrote:
    >
    > Ah, magic - that's done the trick. And just in time, I'm going camping
    > tomorrow for a few weeks - would have been lost without my trusty
    > netbook.
    > Many thanks, I'll make a note of the command for future use! I did poke
    > around looking for information on commands but without knowing where to
    > look, it could take a while.


    "man" is your friend. If you are not sure where to look, "man -k <search_term>"
    will look through all the man files for your <search_term>". The command
    "apropos" is a synonym for "man -k".

  8. #8
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    Default Re: Strange problem with WiFi after 11.3 kernel update

    When I get back I'll look into all that - it's about time I did. I just realised I can use "man man" to start me off.

    I think I've come across this gateway problem before. When 11.4 was released, I installed it on the netbook but came up with the same WiFi problem and after trying to fix it, went back to 11.3 (which worked ok until the recent update). I wouldn't be surprised if it's the same problem. I'll have another go at 11.4 when I return.
    ......but when it comes to computers, I've forgotten more than I ever knew.

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