| Promiscuous Mode |
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Information AboutPromiscuous Mode |
| CATEGORIES ABOUT PROMISCUOUS MODE | |
| network analyzers | |
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Inside each packet is a hardware ( MAC ) address. When a computer receives a particular packet, it checks the hardware address in it to see if the packet is addressed to it. If not, then the network card drops the packet. When in promiscuous mode, the network card doesn't drop the packet, thereby enabling it to read all packets. DETECTION As promiscuous mode can be used in a malicious way to ''sniff'' on a network, one might be interested in detecting network devices that are in promiscuous mode. There are basically two methods to do this: # If a network device is in promiscuous mode, the kernel will receive all network traffic, i. e. the CPU load will increase. Then the latency of network responses will also increase, which can be detected. Of course, this method is very unreliable as the CPU load could just be higher for another reason. # In promiscuous mode, some software might send responses to packets even though they were addressed to another machine. If you see such responses, you can be sure that the originating device is in promiscuous mode. However, experienced sniffers can prevent this (e. g. using carefully designed firewall settings). An example is sending a ping (ICMP echo request) with the wrong MAC address but the right IP address. If you firewall all ICMP traffic, this will be prevented. EXTERNAL LINKS SEE ALSO |
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