support eth0:1 style, support ppp/tun device

support eth0:0 and ppp/tun device 
```
eth0:0    Link encap:Ethernet  HWaddr 00:30:48:dc:a3:2e  
          inet addr:10.10.10.1  Bcast:10.10.10.255 Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
```
```
tun6      Link encap:UNSPEC  HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  
          inet addr:10.8.6.1  P-t-P:10.8.6.2  Mask:255.255.255.255
          UP POINTOPOINT RUNNING NOARP 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:100 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
```