Documentació de l'Ubuntu > Ubuntu 8.10 > Internet and Networks > Xarxa sense fil > Wireless troubleshooting

Wireless troubleshooting

While not exhaustive, this section covers some common problems faced with wireless support.

There is much more information available from the Community Documentation.

[Nota]

This troubleshooting guide is designed to be carried out in order.

Check that the device is on

  1. Many wireless network devices can be turned on or off. Check to see if there is a hardware switch, some devices can be switched off from Windows and may need to be turned back on from Windows.

  2. If it is turned on then see “Check for device recognition”.

Check for device recognition

  1. Open a Terminal (Applications → Accessories → Terminal) and type the command: sudo lshw -C network

You should see an output, along with the words "CLAIMED, UNCLAIMED, ENABLED or DISABLED"

  1. Claimed - this indicates a driver is loaded but not functioning, see “Using Windows Wireless Drivers”

  2. Unclaimed - there is no driver loaded, see “Using Windows Wireless Drivers”.

  3. Enabled - move on to If there is a driver listed then see “Check for a connection to the router”.

  4. Disabled - see “Check that the device is on”.

Check for a connection to the router

  1. Open a Terminal (Applications → Accessories → Terminal) and type the command: iwconfig.

  2. If there is an entry that says ESSID="" then see “Configuring WPA support.”.

  3. If the ESSID for our router is shown there may be a problem with ACPI support. Boot the kernel with the pci=noacpi option.

Check IP assignment

  1. Open a Terminal (Applications → Accessories → Terminal) and type the command: ifconfig.

  2. If there is an IP address shown see “Check DNS”.

  3. From the Terminal enter the command: sudo dhclient if_name where if_name is the connection listed earlier.

  4. If you receive a message that says bound to xxx.xxx.xxx.xxx then see “Check DNS”

  5. If not then reboot the system.

Check DNS

  1. Open a Terminal (Applications → Accessories → Terminal) and type the command: ping -c3 85.190.27.2.

  2. Now type the command: ping www.ubuntu.com. If you get a response from the both then see “IPv6 Not Supported”.

  3. Type the command: cat /etc/resolv.conf. If there is no nameserver listed then contact your ISP and find out your primary and secondary domain name servers. Once you have this information see “Connexió a una xarxa sense fil”.

IPv6 Not Supported

  1. IPv6 is supported by default in Ubuntu and can sometimes cause problems.

  2. To disable it, open a Terminal (Applications → Accessories → Terminal) and type the command: gksudo gedit /etc/modprobe.d/aliases.

  3. Find the line alias net-pf-10 ipv6 and change it to read alias net-pf-10 off.

  4. Reboot Ubuntu.

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Change or disable a wireless network  Inici  Using Windows Wireless Drivers