Hi all,

Since upgrading to 12.04 I've had the following happen on several networks. I am able to connect to the wireless network, and the network applet shows that I'm connected, but I have no internet nor local access. I am not able to ping the router.

The computer is a recent Dell Latitude E6220 and has no other issues. Wifi works under Win7.

Code:
$ ping 127.0.0.1
PING 127.0.0.1 (127.0.0.1) 56(84) bytes of data.
64 bytes from 127.0.0.1: icmp_req=1 ttl=64 time=0.058 ms
64 bytes from 127.0.0.1: icmp_req=2 ttl=64 time=0.056 ms
64 bytes from 127.0.0.1: icmp_req=3 ttl=64 time=0.065 ms

--- 127.0.0.1 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 1998ms
rtt min/avg/max/mdev = 0.056/0.059/0.065/0.009 ms

$ ping 192.168.2.1
PING 192.168.2.1 (192.168.2.1) 56(84) bytes of data.

--- 192.168.2.1 ping statistics ---
3 packets transmitted, 0 received, 100% packet loss, time 2016ms

$ ping 8.8.8.8
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.

--- 8.8.8.8 ping statistics ---
3 packets transmitted, 0 received, 100% packet loss, time 1999ms
Code:
$ cat /etc/network/interfaces 
auto lo
iface lo inet loopback
Code:
$ ifconfig
eth0      Link encap:Ethernet  HWaddr 84:8f:69:f1:46:f9  
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:2460 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2376 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:2045816 (2.0 MB)  TX bytes:307437 (307.4 KB)
          Interrupt:20 Memory:e1c00000-e1c20000 

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:1510 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1510 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:137622 (137.6 KB)  TX bytes:137622 (137.6 KB)

wlan0     Link encap:Ethernet  HWaddr 08:11:96:df:a0:2c  
          inet addr:192.168.2.6  Bcast:192.168.2.255  Mask:255.255.255.0
          inet6 addr: fe80::a11:96ff:fedf:a02c/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:117 errors:0 dropped:0 overruns:0 frame:0
          TX packets:735 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:14266 (14.2 KB)  TX bytes:82010 (82.0 KB)
Code:
$ iwconfig
lo        no wireless extensions.

wlan0     IEEE 802.11abgn  ESSID:"Graymalkin"  
          Mode:Managed  Frequency:2.412 GHz  Access Point: 08:86:3B:B6:3F:E4   
          Bit Rate=117 Mb/s   Tx-Power=15 dBm   
          Retry  long limit:7   RTS thr:off   Fragment thr:off
          Power Management:on
          Link Quality=70/70  Signal level=-27 dBm  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:2  Invalid misc:3   Missed beacon:0

eth0      no wireless extensions.
Code:
$ nm-tool

NetworkManager Tool

State: connected (global)

- Device: wlan0  [Graymalkin] --------------------------------------------------
  Type:              802.11 WiFi
  Driver:            iwlwifi
  State:             connected
  Default:           yes
  HW Address:        08:11:96:DF:A0:2C

  Capabilities:
    Speed:           117 Mb/s

  Wireless Properties
    WEP Encryption:  yes
    WPA Encryption:  yes
    WPA2 Encryption: yes

  Wireless Access Points (* = current AP)
    icsics2:         Infra, 1C:7E:E5:4C:82:AB, Freq 2437 MHz, Rate 54 Mb/s, Strength 17 WPA WPA2
    buh-buh:         Infra, 00:19:E3:FA:E7:2A, Freq 2457 MHz, Rate 54 Mb/s, Strength 20 WPA WPA2
    icsics:          Infra, 00:0F:CB:FC:87:0F, Freq 2457 MHz, Rate 54 Mb/s, Strength 37 WEP
    linksys:         Infra, 00:1E:E5:86:D8:DF, Freq 2437 MHz, Rate 54 Mb/s, Strength 12
    Toepick:         Infra, 00:18:F8:B9:AE:4D, Freq 2437 MHz, Rate 54 Mb/s, Strength 10 WPA
    London3:         Infra, 00:21:29:C9:8C:55, Freq 2412 MHz, Rate 54 Mb/s, Strength 9 WPA WPA2
    flyingpanda:     Infra, 58:6D:8F:C9:3E:E2, Freq 2437 MHz, Rate 54 Mb/s, Strength 22 WPA2
    flyingpanda-guest: Infra, 58:6D:8F:C9:3E:E3, Freq 2437 MHz, Rate 54 Mb/s, Strength 20
    *Graymalkin:     Infra, 08:86:3B:B6:3F:E4, Freq 2412 MHz, Rate 54 Mb/s, Strength 92 WPA WPA2
    carlcap:         Infra, 28:CF:DA:B5:0E:23, Freq 2457 MHz, Rate 54 Mb/s, Strength 22 WPA WPA2

  IPv4 Settings:
    Address:         192.168.2.6
    Prefix:          24 (255.255.255.0)
    Gateway:         192.168.2.1

    DNS:             192.168.2.1


- Device: eth0 -----------------------------------------------------------------
  Type:              Wired
  Driver:            e1000e
  State:             unavailable
  Default:           no
  HW Address:        84:8F:69:F1:46:F9

  Capabilities:
    Carrier Detect:  yes
    Speed:           1000 Mb/s

  Wired Properties
    Carrier:         off