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The end user would choose Community ports or both Open and Community ports. If the end user chooses Community ports only, the end user could then decide to allow all IP's from foreign countries or just the IP's from compliant countries or no foreign IP's, all of this configuration would happen at the ISP level.
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Ports that are used by common VPN tunneling protocols, such as PPTP or L2TP, to establish their connections and transfer data can be closed by system administrators to prevent their use on certain networks. Similarly, a service can prohibit access by blocking access from IP addresses and IP address ranges that are known to belong to VPN providers.
Its role in internet censorship in China is to block access to selected foreign websites and to slow down cross-border internet traffic. [2] The Great Firewall operates by checking transmission control protocol (TCP) packets for keywords or sensitive words. If the keywords or sensitive words appear in the TCP packets, access will be closed.
IP address blocking is commonly used to protect against brute force attacks and to prevent access by a disruptive address. It can also be used to restrict access to or from a particular geographic area; for example, syndicating content to a specific region through the use of Internet geolocation. [1]
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Deep packet inspection (DPI) is a type of data processing that inspects in detail the data being sent over a computer network, and may take actions such as alerting, blocking, re-routing, or logging it accordingly.