2 ip addresses of the same LAN on one interface

[Mariko]

Does anyone know how to set up 2 ip addresses of the same LAN on one interface??

 

[wybnormal]

subinterfaces or use secondary IP addressing.

MikeS
Find me at

http://www.packetattack.com

"Diplomacy; the art of saying 'nice doggie' till you can find a rock" Wynn Catlin

 

[jeter]

it should look something like this.

interface FastEthernet0
ip address 172.16.6.1 255.255.255.0 secondary
ip address 192.168.1.1 255.255.255.0
no ip directed-broadcast
shutdown

Jeter@LasVegas.com
J.Fisher CCNA

 

[Mariko]

I am sorry, but I am a bit confused.

So, I cannot set
192.168.10.1/24 and
192.168.10.2/24
on the same interface, can I??

 

[ChrisAC]

Could you explain why you want to do this??

 

[Mariko]

We are going to remove a router, but then, we will have
an extra ip address, which cannot be removed because
it is used as default.

We tested "secondary address", but it seemed okay if
they are of the same network.

Thanks a lot

 

[wybnormal]

Using the secondary interface allows you to use two IPs on the same interface connected to the same network. Pretty common trick to use when you are trying to migrate from one subnet to a new one but can not afford the downtime.

I use it alot for testing without breaking any current network connection.

MikeS Find me at

http://www.packetattack.com

"Diplomacy; the art of saying 'nice doggie' till you can find a rock" Wynn Catlin