In our local school we have two servers and roughly 80 clients. The network is 192.168.10.0/255.255.255.0, and DHCP+DNS is managed by Dnsmasq.
School PCs (teachers and management) are registered via MAC address and get an IP address in a specific range:
192.168.10.2 – 192.168.10.50 – management + teachers
192.168.10.201 – 192.168.10.220 – computer room
192.168.10.246 – 192.168.10.247 – printers
192.168.10.251 – 192.168.10.253 – wireless access points
If a client (like a student’s laptop, tablet or smartphone) is not registered, it gets an IP address in the range between 192.168.10.100
Up until recently I’ve been using a combination of Squid and Squidguard to filter Internet access.
This year the school’s director wants to completely block Internet access for all the student’s personal devices.
The Linux server acts as a transparent gateway. Unfortunately with Squid I can only filter/block HTTP connections, but not HTTPS (well, I could, but this is way too complicated to setup).
The firewall is managed by a simple Iptables script. Now I *think* the easiest way to block a certain IP range from Internet access would be through Iptables (correct me if I’m wrong). If this is the case, what would that look like?