[root@fcku ~]# ip a s eth0
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:23:54:20:73:3e brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.105/24 brd 192.168.1.255 scope global eth0
    inet6 fe80::223:54ff:fe20:733e/64 scope link 
       valid_lft forever preferred_lft forever
[root@fcku ~]# ip a a 1.1.1.1/24 dev eth0
[root@fcku ~]# ip a a 1.1.1.2/24 dev eth0
[root@fcku ~]# ip a a 1.1.1.3/24 dev eth0
[root@fcku ~]# ip a s eth0
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:23:54:20:73:3e brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.105/24 brd 192.168.1.255 scope global eth0
    inet 1.1.1.1/24 scope global eth0
    inet 1.1.1.2/24 scope global secondary eth0
    inet 1.1.1.3/24 scope global secondary eth0
    inet6 fe80::223:54ff:fe20:733e/64 scope link 
       valid_lft forever preferred_lft forever
[root@fcku ~]# ip r s
default via 192.168.1.1 dev eth0  metric 202 
1.1.1.0/24 dev eth0  proto kernel  scope link  src 1.1.1.1 
192.168.1.0/24 dev eth0  proto kernel  scope link  src 192.168.1.105  metric 202 
[root@fcku ~]# ip r replace 1.1.1.0/24 dev eth0  proto kernel  scope link  src 1.1.1.2
[root@fcku ~]# ip r s
default via 192.168.1.1 dev eth0  metric 202 
1.1.1.0/24 dev eth0  proto kernel  scope link  src 1.1.1.2 
192.168.1.0/24 dev eth0  proto kernel  scope link  src 192.168.1.105  metric 202 
[root@fcku ~]# ip a d 1.1.1.2/24 dev eth0
[root@fcku ~]# ip a s eth0
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:23:54:20:73:3e brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.105/24 brd 192.168.1.255 scope global eth0
    inet 1.1.1.1/24 scope global eth0
    inet 1.1.1.3/24 scope global secondary eth0
    inet6 fe80::223:54ff:fe20:733e/64 scope link 
       valid_lft forever preferred_lft forever
[root@fcku ~]# ip r s
default via 192.168.1.1 dev eth0  metric 202 
192.168.1.0/24 dev eth0  proto kernel  scope link  src 192.168.1.105  metric 202 
[root@fcku ~]# uname -a
Linux fcku 3.6.10-1-ARCH #1 SMP PREEMPT Tue Dec 11 09:40:17 CET 2012 x86_64 GNU/Linux
[root@fcku ~]# ip -V
ip utility, iproute2-ss121001
[root@fcku ~]#