another computer on your network is using your computer - Hack suspicion - ip address through DHCP lease renewal. Help, please

Hello fellow Mac users...

Today, while using, Firefox A message appeared on my screen: another computer on your network is using the ip address of your computer.

Now, I am 100% sure that my phone was turned off when it happened. And I have a password on my wifi connection.

I panicked because no one should have access to my network or my IP address. Immediately, I turned off my modem and turned off the wifi on my mac.

Later, I went to renew the DHCP lease.

My question is this:

Could it be, in theory, based on the message system I (another computer on your network is using the ip address of your computer) the IP address was stolen (for lack of a better word) by a remote user, which is not in my physical neighborhood that is resident in another city or even country?

If so, then I did the right thing by closing my Modem? And later on the DHCP lease renewal? About 20-30 minutes past until what I actually renewed the DHCP lease. It, in theory, could have too late to do (assuming that a malicious user has chosen to masquerade himself with my IP address)?

Thank you all very much!

I'm not a specialist iP/Wifi etc, I'm more than a convenience store of OS X, but...

What was the popup of? -FireFox, the webpage or your Mac?

If it's from the Web page--> then you may have entered a suspicious site that created an alert.

Tags: Notebooks

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