I have need to have my ASA5505 listen on 2 IP addresses in the same subnet on the INSIDE interface (VLAN1).
The reason - another device with this secondary IP is being removed and I need to have the ASA listen on *both* its own IP and the IP of the device removed, at least until I find every device using the old gateway IP.
ASA (inside, VLAN1): 192.168.1.1 255.255.255.0
Old device "X": 192.168.1.10 255.255.255.0
I need something similar to (in router-speak):
int vlan 1
ip address 192.168.1.1 255.255.255.0
ip address 192.168.1.10 255.255.255.0 secondary