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Ubuntu - Networking - Configuration - Promiscuous Mode

ip link set eth1 promisc on

ifconfig eth0 promisc

Put the following in /etc/sysconfig/network-scripts/ifcfg-eth1

BOOTPROTO=static
DEVICE=eth1
ONBOOT=yes
TYPE=Ethernet
PROMISC=yes
USERCTL=no
PEERDNS=no
HWADDR=xx:xx:xx:xx:xx:xx

Change eth1 and the hardware address (HWADDR=xx:xx:xx:xx:xx:xx) to reflect your system.