I want to hide my computer IP dan hostname when I am online on the same LAN on which other computers running netcut and other network tools. I have installed netcut defender but it seems not to hide my identity.
Is it possible to hide my identity?
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Actually, I disagree with tylerl's answer. It is indeed difficult to hide our IP from other hosts on a LAN, it's very possible.
Because you're mentioning netcut (a tool that works by using ARP poisoning), I think you have the following setup:
The idea is quite simple: All you need is to block all inbound connections to your computer and all broadcast communications from your computer. This requires a slight knowledge of the network (at least the router's MAC and IP address) as you'll have drop all ARP requests (in and out). The only thing left to do is configure the router's IP address as your gateway and only communicate with it.
That method will indeed keep you hidden on the network as only the router will know of your existence. It will also protect you from netcut as your IP will not show on other hosts' ARP tables. However, this will not protect you from other ARP poisoning attacks that can spy on your connection and even completely cut you off.