Enabling and disabling promiscuous mode for a network adapter

1. Navigate to the environment you want to edit.
2. Click Settings to open the VM Settings page.
3. For the network adapter you want to edit, click Edit Network Adapter.
4. Next to Promiscuous mode, select Enabled. The network adapter is now set for promiscuous mode.

A network card usually is in promiscuous mode when:

1. If it was manually configured in that mode using ifconfig command.
2. If a Network monitor tool is used, like tcpdump etc.
3. In bridge network, the NIC is mostly required to operate in promiscuous mode.

ARP Test – When in promiscuous mode the driver for the network card checks for the MAC address being that of the network card for unicast packets, but only checks the first octet of the MAC address against the value 0xff to determine if the packet is broadcast or not.Ordibe

Disable Promiscuous Mode

1. To disable promiscuous mode on the physical NIC, run the following command on the XenServer text console: # ifconfig eth0 –promisc.
2. Run the ifconfig command again and notice that promiscuous mode is now disabled.

Promiscuous mode is a security policy which can be defined at the virtual switch or portgroup level in vSphere ESX/ESXi. A virtual machine, Service Console or VMkernel network interface in a portgroup which allows use of promiscuous mode can see all network traffic traversing the virtual switch.

To enable promiscuous mode on a physical NIC, run this command — as laid out by Citrix support documents for its XenServer virtualization platform — in the text console: # ifconfig eth0 promisc. To disable promiscuous mode, run this command on the XenServer text console: # ifconfig eth0 –promisc.

An Intrusion Detection System (IDS) passively monitors network traffic at multiple locations within your network by using IDS sensors. This monitoring is referred to as promiscuous mode because it involves placing a network interface into promiscuous mode and then examining all of the traffic through the interface.

Answer: In a network, promiscuous mode allows a network device to intercept and read each network packet that arrives in its entirety. In an Ethernet local area network ( LAN), promiscuous mode is a mode of operation in which every data packet transmitted can be received and read by a network adapter.

Promiscuous mode is a type of computer networking operational mode in which all network data packets can be accessed and viewed by all network adapters operating in this mode. Promiscuous mode is used to monitor(sniff) network traffic.

It is a network security, monitoring and administration technique that enables access to entire network data packets by any configured network adapter on a host system. Promiscuous mode is used to monitor(sniff) network traffic.