i connect to the web via LAN and IPs are assigned via the DHCP server. so a simple
sudo dhclient -r
sudo dhclient
does not work. is there another way to get a new IP address from the DHCP server?
as far as i know, most of the time ISPs change the IP address-URL association in their DNS servers, so the URL is redirected to a page which displays the user a "this site is blocked" page. if an ISP really wants to stop the access to many hosts (tens of thousands), is it feasible for the ISP to start blocking their IP adresses? as i reckon, the ISP must filter out every packet by reading the header—which would be a very costly operation.
I was wondering whether it is possible to ban a PC from LAN or WLAN totally or not? I know that banning according to MAC address is useless, as it can be altered.
P.S: assume that no credentials are required to connect the LAN/WLAN.