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I have an unmanaged switch which serves traffic belonging to different subnets. Lets say these are the subnets:

192.168.0.0/24
192.168.1.0/24
192.168.2.0/24
And few more subnets which I am not aware of.

I have a Linux machine having 192.168.0.1 as IP on 192.168.0.0/24 subnet. Using this machine I want to discover the arp address's of all the machines that are on different subnets. After arp address's are found, I want to discover their IP address's too. Can this be done?

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You can do this with ettercap. You may want to google for "arp spoofing" and "switched sniffing" for more details.

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