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This command is often used to obtain the IP of an abusive user to more effectively perform a ban. It is unclear what, if any, privileges are required to execute this command on a server. This command is not formally defined by an RFC, but is in use by some IRC daemons. Support is indicated in a RPL_ISUPPORT reply (numeric 005) with the USERIP ...
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.
IRC operators are divided into local and global operators. The former are limited to the server(s) they have specific access to; however, global operators can perform actions affecting all users on the network. In order to perform their duties, IRC operators usually have the ability to: Forcibly disconnect users (Kill) Ban (K-line or G-line) users
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. [ 5 ] [ 6 ] Optionally longer bans can be custom-configured for "recidivist" abusers that keep coming back. [ 2 ]
The server owner (or users that have access to the live server files) can also set up and install plugins to change the mechanics of the server, add commands among other features, and can also set up restrictions concerning which usernames or IP addresses are allowed or disallowed to enter the game server. [2]
On the Internet, a block or ban is a technical measure intended to restrict access to information or resources. Blocking and its inverse, unblocking, may be implemented by the owners of computers using software. [1] Blocking may also refer to denying access to a web server based on the IP address of the client machine. [2]
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.
In computer security, an access-control list (ACL) is a list of permissions [a] associated with a system resource (object or facility). An ACL specifies which users or system processes are granted access to resources, as well as what operations are allowed on given resources. [1] Each entry in a typical ACL specifies a subject and an operation.