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2. IP address blocking - Wikipedia

   en.wikipedia.org/wiki/IP_address_blocking

   Unix-like operating systems commonly implement IP address blocking using a TCP wrapper, configured by host access control files /etc/hosts.deny and /etc/hosts.allow.. Both companies and schools offering remote user access use Linux programs such as DenyHosts or Fail2ban for protection from unauthorized access while allowing permitted remote access.

3. Fail2ban - Wikipedia

   en.wikipedia.org/wiki/Fail2ban

   Most commonly this is used to block selected IP addresses that may belong to hosts that are trying to breach the system's security. It can ban any host IP address that makes too many login attempts or performs any other unwanted action within a time frame defined by the administrator. It includes support for both IPv4 and IPv6.

4. DNS blocking - Wikipedia

   en.wikipedia.org/wiki/DNS_blocking

   Free speech and due process are key concerns regarding DNS blocking, particularly in the United States. DNS blocking was proposed to be mandated by the Stop Online Piracy Act (SOPA) and the PROTECT IP Act (PIPA). [4] It is a technique that essentially breaks the fundamental architecture of the internet.

5. List of assigned /8 IPv4 address blocks - Wikipedia

   en.wikipedia.org/.../8_IPv4_address_blocks

   Some large / 8 blocks of IPv4 addresses, the former Class A network blocks, are assigned in whole to single organizations or related groups of organizations, either by the Internet Corporation for Assigned Names and Numbers (ICANN), through the Internet Assigned Numbers Authority (IANA), or a regional Internet registry.

6. VPN blocking - Wikipedia

   en.wikipedia.org/wiki/VPN_blocking

   Similarly, a service can prohibit access by blocking access from IP addresses and IP address ranges that are known to belong to VPN providers. [1] [2] Some governments have been known to block all access to overseas IP addresses, since VPN use can involve connecting to remote hosts that do not operate under that government's jurisdiction. [3]

7. Wikipedia : Blocking IP addresses

   en.wikipedia.org/.../Wikipedia:Blocking_IP_addresses

   Most IP addresses should not be blocked more than a few hours, since the malicious user will probably move on by the time the block expires. If there is persistent disruption or vandalism from an IP address, the block should be extended (with the 'anon-only' option selected) as long as is necessary to prevent further disruption.