I'm having trouble connecting to wifi. I have a fresh install of Raspbian, all packages are up to date. 

The wifi adapter ([Belkin N300 Micro Wireless USB Adapter - model F7D2102](http://www.belkin.com/us/p/P-F7D2102)) is being detected, so there's no issue there; here's the output of `lsusb`: 

    Bus 001 Device 002: ID 0424:9512 Standard Microsystems Corp
    Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 hub
    Bus 001 Device 008: ID 05ac:020b Apple, Inc. Pro Keyboard [Mitsumi, A1048/US layout]
    BUS 001 Device 003: ID 0424:ec00 Standard Microsystems Corp.
    BUS 001 Device 004: ID 050d:2103 Belkin Components F7D2102 802.11n N300 Micro Wireless Adapter v3000 [Realtek RTL8192CU]
    BUS 001 Device 005: ID 050d:0304 Belkin Components FSU304 USB 2.0 - 4 Ports Hub
    BUS 001 Device 006: ID 05ac:0302 Apple, Inc. Optical Mouse [Fujitsu]
    BUS 001 Device 007: ID 05ac:1003 Apple, Inc. Hub in Pro Keyboard {Mitsumi, A1048]

And here's the output of `iwconfig`: 

    wlan0     IEEE 802.11bgn  ESSID:"MY-NETWORK-NAME"  Nickname:"<WIFI@REALTEK>"
              Mode:Managed  Frequency:2.452 GHz  Access Point: <mac address>
              Bit Rate: 300 Mb/s   Sensitivity:0/0
              Retry:off   RTS thr:off   Fragment thr:off
              Power Management:off
              Link Quality=98/100  Signal level=63/100  Noise level=0/100
              Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
              Tx excessive retries:0  Invalid misc:0  Missed beacon:0
    
    lo        no wireless extensions
    
    eth0      no wireless extensions

This is what I have in `/etc/network/interfaces`:

    eth0      Link encap:Ethernet  HWaddr:b8:27:eb:28:5c:6c
              UP BROADCAST MULTICAST MTU:1500  Metric:1
              RX packets:0 errors:0 dropped:0 overruns:0 frame:0
              TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:1000
              RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
    
    lo        Link encap:Local Loopback
              inet addr:127.0.0.1  Mask:255.0.0.0
              UP LOOPBACK RUNNING  MTU:16436  Metric:1
              RX packets:0 errors:0 dropped:0 overruns:0 frame:0
              TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:1000
              RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
    
    wlan0     Link encap:Ethernet  HWaddr ec:1a:59:64:3a:36
              UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
              RX packets:10 errors:0 dropped:26 overruns:0 frame:0
              TX packets:2 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:1000
              RX bytes:2586 (2.5KiB)  TX bytes: 288(288.0 B)
          
This is my `/etc/network/interfaces`:

    auto lo
    
    iface lo inet lookback
    iface eth0 inet dhcp
    
    allow-hotplug wlan0
    iface wlan0 inet manual
    address 192.168.2.34
    netmask 255.255.255.0
    gateway 192.168.2.1
    wpa-roam /etc/wpa_supplicant/wpa_supplicant.conf

And this is what I have in `/etc/wpa_supplicant/wpa_supplicant.conf`:

    ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
    update_config=1
    
    network={
    ssid="<my-network-name>"
    psk="<my-network-password>"
    proto=RSN
    key_mgmt=WPA-PSK
    pairwise=CCMP TKIP
    group=CCMP TKIP
    auth_alg=OPEN
    }

But no luck when I try to ping `google.com`:

    pi@raspberrypi ~ $ ping google.com
    ping: unknown host google.com

Any ideas? Let me know if I can include any additional information here.