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nm-applet reports 802.11 connected, but can't actually communicate over network?



I'm trying to use my Testing system with a Realtek rtl8188ce 802.11 adapter.
I use Gnome's nm-applet to connect to the wireless access point, and it
accepts the passphrase and connects, fine. However, all attempts to do
anything over the network fail, e.g. ping, traceroute, attempts to open a
web page all time out with no result.

My first thought was name resolution but I get the same thing with an IP
address.

My Windows 8.1 ultrabook connects to this network fine. So does my Android
phone. So does my (company-issue) iPad. Why is the Debian system failing?

I do have the Realtek nonfree firmware installed and this system worked OK
in another building using a different WiFi router.

Output of ifconfig:
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:65536  Metric:1
          RX packets:4151 errors:0 dropped:0 overruns:0 frame:0
          TX packets:4151 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:883087 (862.3 KiB)  TX bytes:883087 (862.3 KiB)

wlan0     Link encap:Ethernet  HWaddr 00:e0:4c:a1:07:a5  
          inet addr:192.168.1.109  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::2e0:4cff:fea1:7a5/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:796 errors:0 dropped:0 overruns:0 frame:0
          TX packets:828 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:251403 (245.5 KiB)  TX bytes:103301 (100.8 KiB)



Output of route: -v
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
default         192.168.1.1     0.0.0.0         UG    0      0        0 wlan0
192.168.1.0     *               255.255.255.0   U     0      0        0 wlan0

Thanks in advance for any help you may be able to provide.
-- 
Carl Fink                           carlf@li-con.org
Chair, LI-CON, March 29-30, 2014, Rockville Centre, NY
Con Site: http://li-con.org


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