Yes, it is possible for schools to block VPNs (virtual private networks). There are a few different ways that this can be done:
- The school’s internet service provider (ISP) can block VPNs at the network level. This means that the VPN traffic is stopped before it even reaches the school’s network.
- The school’s firewall can be configured to block VPN traffic. This is done by creating rules that block traffic from certain IP addresses or ports that are known to be used by VPNs.
- The school can use a web filtering service to block VPN websites. This is done by adding the URLs of VPN websites to a list of blocked websites.
- The school can use a network monitoring tool to detect and block VPN traffic. This is done by analyzing network traffic and identifying patterns that are characteristic of VPN use.
It is worth noting that some VPNs are more difficult to block than others. Some VPNs use advanced encryption and obfuscation techniques to make it harder for ISPs, firewalls, and web filters to detect and block their traffic. Additionally, some VPNs have servers located in countries where VPNs are legal and not blocked, which can make it harder for schools to block them.