Debian set an eth alias with static ip on link with dhcp

# vi /etc/network/interfaces

# static alias
 auto eth0:0
 allow-hotplug eth0:0
 iface eth0:0 inet static
 address 192.168.0.10
 netmask 255.255.255.0

Restart network

# service networking restart

Check

# ifconfig
 eth0:0 Link encap:Ethernet HWaddr 02:09:04:c0:d4:d0
 inet addr:192.168.0.10 Bcast:192.168.0.255 Mask:255.255.255.0
 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
 Interrupt:117 Base address:0xc000

source:
https://wiki.debian.org/NetworkConfiguration