My eth0 is using DHCP to get IP address for Internet.
However I still need to set some static IP for my LAN. 
The following is my setting in /etc/network/interface. 
Any problem on the script ? I always failed when I try to start network.

I checked the IP via ifconfig. and found eth0:3 is set but others.
May I know what's the problem?

```
  1 auto lo
  2 iface lo inet loopback
  3 
  4 #auto eth0
  5 #iface eth0 inet dhcp
  6 
  7 auto eth0:1
  8 iface eth0:1 inet static
  9 address 192.168.20.222
 10 netmask 255.255.255.0
 11 gateway 192.168.20.1
 12 
 13 auto eth0:2
 14 iface eth0:2 inet static
 15 address 192.168.30.222
 16 netmask 255.255.255.0
 17 gateway 192.168.30.1
 18 
 19 auto eth0:3
 20 iface eth0:3 inet static
 21 address 192.168.211.222
 22 netmask 255.255.255.0
 23 gateway 192.168.221.1   

```