How can I set promiscuous mode so I can run a network based IDS?

Updated -

Most network-based IDSes require that the host system network device be set to promiscuous mode, which allows the device to capture every packet passed on the network. Promiscuous mode can be set through the ifconfig command, such as the following:

ifconfig eth0 promisc

Running ifconfig with no options reveals that eth0 is n...

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