I am wondering why my router has one public IP, and if disconnect the router and connect my laptop directly into the wall, I get another public IP, and if I connect my other laptop, I get yet another public IP.
I am using DHCP on all devices.
I tried releasing and renewing the DHCP lease, but I keep getting the same IP (3 different ones) on all devices.
I thought that my ISP would give the same IP to all my devices if they connect to the same outlet in the wall, but that does not seem to be the case. They do not seem to care either that I release and renew the lease.
Do they store the MAC adress connected and give that device a DHCP lease, and then keep that for however long they want? Or how do they know to give the same IP to my different devices every time? Is this normal practice by an ISP?
I took a couple of screenshots from 2 of my devices, to illustrate my point.
I searched on google, but found mostly posts about how someone's router's public IP differs from the public IP you find when you run curl https://ipinfo.io/ip for example, which is not the case here.