Systems and methods for determining input and out interfaces of a network device and copies of a same packet going through the network device

摘要

A method performed by a network device that taps to a network having a routing device, includes: receiving a first packet tapped from the network; determining a first information regarding an input interface of the routing device based on a destination address of the first packet; receiving a second packet tapped from the network; determining a second information regarding an output interface of the routing device based on a source address of the second packet; determining a first CRC for the first packet; determining a second CRC for the second packet; and comparing the first CRC with the second CRC at the network device to determine whether the first packet and the second packet are the same.

主权项

1. A method performed by a network device that taps to a network having a routing device, comprising:
receiving a first packet tapped from the network; determining a first information regarding an input interface of the routing device based on a destination address of the first packet by comparing the destination address of the first packet with a source address of a discovery protocol packet, wherein the first information is determined using a processing unit; receiving a second packet tapped from the network; determining a second information regarding an output interface of the routing device based on a source address of the second packet, wherein the second information is determined using the processing unit; determining a first CRC for the first packet; determining a second CRC for the second packet; and comparing the first CRC with the second CRC at the network device to determine whether the first packet and the second packet are the same.