bash-3.2# ifconfig -a
lo0: flags=2001000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv4,VIRTUAL> mtu 8232 index 1
    inet 127.0.0.1 netmask ff000000
rge0: flags=201000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4,CoS> mtu 1500 index 2
    inet 10.10.163.111 netmask ffffff00 broadcast 10.10.163.255
    ether 0:f:ea:c0:9a:eb
sppp0: flags=10010008d1<UP,POINTOPOINT,RUNNING,NOARP,MULTICAST,IPv4,FIXEDMTU> mtu 1492 index 5
    inet 217.172.8.6 --> 192.168.131.1 netmask ffffff00
    ether 0:0:0:0:0:0
lo0: flags=2002000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv6,VIRTUAL> mtu 8252 index 1
    inet6 ::1/128

bash-3.2# netstat -rn

Routing Table: IPv4
  Destination           Gateway           Flags  Ref     Use     Interface
-------------------- -------------------- ----- ----- ---------- ---------
default              192.168.131.1        UG        1          0          
10.10.163.0          10.10.163.111        U         1          0 rge0      
192.168.131.1        217.172.8.6          UH        1          0 sppp0    
127.0.0.1            127.0.0.1            UH        1          0 lo0      

Routing Table: IPv6
  Destination/Mask            Gateway                   Flags Ref   Use    If  
--------------------------- --------------------------- ----- --- ------- -----
::1                         ::1                         UH      1       0 lo0  

bash-3.2# nslookup www.ru
Server:        217.172.16.8
Address:    217.172.16.8#53

Non-authoritative answer:
Name:    www.ru
Address: 194.87.0.50

bash-3.2# ping 194.87.0.50
194.87.0.50 is alive

bash-3.2# ping www.ru
ping: unknown host www.ru

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Подскажите, в чём дело?
Спасибо.