looks like some router and adapter uncompability.

router zyxel  P-2812HNU-F3
http://www.zyxel.com/no/no/products_services/p_2812hnu_fx_series.shtml?t=p

and statement in router wireless specifications "Backward compatible to
802.11b/g" is not 100% correct ...

adapter
lsusb:
Bus 001 Device 003: ID 0846:4260 NetGear, Inc. WG111v3 54 Mbps Wireless 
[realtek RTL8187B]

Symptoms:
ping to router 
 ping 10.0.0.138
PING 10.0.0.138 (10.0.0.138) 56(84) bytes of data.
^C
--- 10.0.0.138 ping statistics ---
26 packets transmitted, 0 received, 100% packet loss, time 25000ms



uname -na :
Linux irmute 3.11.0-2-lowlatency #1-Ubuntu SMP PREEMPT Fri Aug 16 22:06:58 UTC 
2013 i686 i686 i686 GNU/Linux


modprobe --show-depends rtl8187:
insmod 
/lib/modules/3.11.0-2-lowlatency/kernel/drivers/misc/eeprom/eeprom_93cx6.ko 
insmod /lib/modules/3.11.0-2-lowlatency/kernel/net/wireless/cfg80211.ko 
insmod /lib/modules/3.11.0-2-lowlatency/kernel/net/mac80211/mac80211.ko 
insmod 
/lib/modules/3.11.0-2-lowlatency/kernel/drivers/net/wireless/rtl818x/rtl8187/rtl8187.ko
 

iwconfig wlan1:
wlan1     IEEE 802.11bg  ESSID:"XXXXXXXXXX"  
          Mode:Managed  Frequency:2.412 GHz  Access Point: CC:5D:4E:1B:46:44   
          Bit Rate=1 Mb/s   Tx-Power=20 dBm   
          Retry  long limit:7   RTS thr:off   Fragment thr:off
          Power Management:off
          Link Quality=39/70  Signal level=-71 dBm  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:1  Invalid misc:0   Missed beacon:0

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https://bugs.launchpad.net/bugs/802902

Title:
  Realtek rtl8187b wireless chipset slow speed

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