There are in fact many cases where you want an interface brought up without having to apply an IP address.
* A virtual machine host where VM:s are connected to an interface but the host itself should not reside on that network.
* VPN gateways bridging the external interface with an internal interface where the internal interface doesn't need to have an IP address on that network.
There are in fact many cases where you want an interface brought up without having to apply an IP address.
* A virtual machine host where VM:s are connected to an interface but the host itself should not reside on that network.
* VPN gateways bridging the external interface with an internal interface where the internal interface doesn't need to have an IP address on that network.
* Network sniffers