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Why promiscuous mode is required?
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.
For what reason would a network administrator leverages promiscuous mode on a network interface?
cissp answers
| Question | Answer |
|---|---|
| “For what reason would a network administrator leverage promiscuous mode?” | “To monitor the network to gain a complete statistical picture of activity.” |
| “One method to simplify the administration of access controls is to group” | “Objects and subjects” |
How do I set interface promiscuous mode?
Enable Promiscuous Mode
- To enable the promiscuous mode on the physical NIC, run the following command on the XenServer text console: # ifconfig eth0 promisc.
- Run the ifconfig command and notice the outcome: eth0 Link encap:Ethernet HWaddr 00:1D:09:08:94:8A. inet6 addr: fe80::21d:9ff:fe08:948a/64 Scope:Link.
What makes an interface go into promiscuous mode?
Interfaces are placed into promiscuous mode by software bridges often used with hardware virtualization . In IEEE 802 networks such as Ethernet or IEEE 802.11, each frame includes a destination MAC address.
When does a NIC drop a frame in promiscuous mode?
In IEEE 802 networks such as Ethernet or IEEE 802.11, each frame includes a destination MAC address. In non-promiscuous mode, when a NIC receives a frame, it drops it unless the frame is addressed to that NIC’s MAC address or is a broadcast or multicast addressed frame.
How can I tell if my network is in promiscuous mode?
Here’s a quick python script to test promiscuous mode for all interfaces: # and determines if the device in promiscuous mode. Figuring out if a given network device is in promiscuous mode using tools like iproute2 or netstat can be trickier than you’d think.
Do you need superuser privileges for promiscuous mode?
Many operating systems require superuser privileges to enable promiscuous mode. A non-routing node in promiscuous mode can generally only monitor traffic to and from other nodes within the same broadcast domain (for Ethernet and IEEE 802.11) or ring (for token ring).