In both Linux and FreeBSD, we can enable/disable promiscuous mode for an interface using "ifconfig". The parameters "promisc" and "-promisc" are used to enable and disable promiscuous mode respectively. In Solaris, promiscuous mode can be enabled using "snoop".

Examples

Linux
Enable promiscuous mode of the interface eth0:

# ifconfig eth0 promisc

Disable promiscuous mode of the interface eth0

# ifconfig eth0 -promisc

FreeBSD
Enable promiscuous mode of the interface nxge0

# ifconfig nxge0 promisc

Disable promiscuous mode of the interface nxge0

# ifconfig nxge0 -promisc

Solaris
Enable promiscuous mode of the interface vxge0

# snoop -d vxge0

Quit snoop to disable promiscuous mode