root@SMGL-1420n:/etc/network# cat interfaces
### /etc/network/interfaces -- configuration file for ifup(8), ifdown(8)
##### Loopback interface #####
auto lo
iface lo inet loopback

##### Tigon3 interface ######
auto eth0
iface eth0 inet static
  address 192.168.2.100
  netmask 255.255.255.0

##### iwl3945 interface #####
auto eth1
iface eth1 inet dhcp

##### iwl3945 interface #####
#iface wlan0 inet dhcp


root@SMGL-1420n:/etc/udev/rules.d# cat 70-persistent-net.rules 
SUBSYSTEM=="net", DRIVERS=="?*", ATTRS{address}=="00:1B:77:88:CA:06", NAME="eth1"


root@SMGL-1420n:/etc/network# ifconfig -a
eth0      Link encap:Ethernet  HWaddr 00:1A:A0:FC:BE:F2  
          inet addr:192.168.2.100  Bcast:192.168.2.255  
Mask:255.255.255.0
          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)
          Interrupt:17 

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:0 
          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)

wlan0     Link encap:Ethernet  HWaddr 00:1B:77:88:CA:06  
          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)

wmaster0  Link encap:UNSPEC  HWaddr 00-1B-77-88-CA-06-00-00-00-00-00-00-00-00-00-00  
          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)


root@SMGL-1420n:/etc/network# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:1A:A0:FC:BE:F2  
          inet addr:192.168.2.100  Bcast:192.168.2.255  Mask:255.255.255.0
          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)
          Interrupt:17 

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:0 
          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)



root@SMGL-1420n:/etc/udev/rules.d# ifup wlan0
Ignoring unknown interface wlan0=wlan0.

root@SMGL-1420n:/etc/udev/rules.d# ifup wmaster0
Ignoring unknown interface wmaster0=wmaster0.

root@SMGL-1420n:/etc/udev/rules.d# ifup eth1
err, eth1: ioctl SIOCGIFHWADDR: No such device
Failed to bring up eth1.


root@SMGL-1420n:/etc/udev/rules.d# telinit run network restart
network: Restarting ALL interfaces
network: Stopping networking...   
network: success               
network: Starting networking...
err, eth1: ioctl SIOCGIFHWADDR: No such device
Failed to bring up eth1.
network: success


root@SMGL-1420n:/etc/sysconfig/network# ls
root@SMGL-1420n:/etc/sysconfig/network#


root@SMGL-1420n:~# ls /sys/class/net/
eth0  lo  wlan0  wmaster0