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:~$ cat /etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

auto p3p1
iface p3p1 inet static
   address 192.168.1.2
   netmask 255.255.255.0
   gateway 192.168.1.1
   dns-search google.com
   dns-nameservers 8.8.8.8  

auto p5p1
iface p5p1 inet static
   address 10.0.0.1
   netmask 255.255.255.0
#   gateway 192.168.1.2
#   dns-search google.com
#   dns-nameservers 8.8.8.8
ian072@sundown:~$ 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:156 errors:0 dropped:0 overruns:0 frame:0
          TX packets:156 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:10840 (10.8 KB)  TX bytes:10840 (10.8 KB)

p3p1      Link encap:Ethernet  HWaddr d0:50:99:7d:26:6b  
          inet addr:192.168.1.2  Bcast:192.168.1.255  Mask:255.255.255.0                                                                       
          inet6 addr: fe80::d250:99ff:fe7d:266b/64 Scope:Link                                                                                  
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1                                                                                   
          RX packets:4147 errors:0 dropped:0 overruns:0 frame:0                                                                                
          TX packets:4783 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:1589482 (1.5 MB)  TX bytes:497931 (497.9 KB)

p5p1      Link encap:Ethernet  HWaddr 48:ee:0c:bc:01:99  
          inet addr:10.0.0.1  Bcast:10.0.0.255  Mask:255.255.255.0
          inet6 addr: fe80::4aee:cff:febc:199/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:812 errors:0 dropped:0 overruns:0 frame:0
          TX packets:134 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:66281 (66.2 KB)  TX bytes:10585 (10.5 KB)