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ARP only works on the same LAN (layer-2 broadcast domain) because an ARP request is a broadcast. Broadcasts do not cross a layer-3 boundary. MAC addresses are layer-2 addresses, and they are only significant, or even seen, on the same layer-2 broadcast domain. A host wishing to send traffic to a different layer-3 network will send the traffic to the layer-2 ...


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Install nmap to your OpenWRT router: opkg update;opkg install nmap Scan all network.For example,the network is: 203.120.12.0/24 nmap -v -sn 203.120.12.0/24 --open It should show something like this: Nmap scan report for 203.120.12.253 Host is up (0.00016s latency). MAC Address: 04:18:D6:83:90:07 (Ubiquiti Networks) Then u can use the grep command ...


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That is correct. With no Vlans, and therefore no network segmentation, ARP spoofing is particularly problematic because all clients are affected regardless of subnet. For example, if you have a client on say 172.21.1.100/24, a gateway on 172.21.1.1/24 and a malicious actor on 192.168.1.100, gratuitous ARP messages can be sent to all devices, pertaining to ...



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