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Fail2ban is similar to DenyHosts [...] but unlike DenyHosts which focuses on SSH, fail2ban can be configured to monitor any service that writes login attempts to a log file, and instead of using /etc/hosts.deny only to block IP addresses/hosts, fail2ban can use Netfilter/iptables and TCP Wrappers /etc/hosts.deny.
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.
Below is a list of FTP commands that may be sent to a File Transfer Protocol (FTP) server. It includes all commands that are standardized by the Internet Engineering Task Force (IETF) in RFC 959, plus extensions. Note that most command-line FTP clients present their own non-standard set of commands to users. For example, GET is the common user ...
lftp is a command-line program client for several file transfer protocols. lftp is designed for Unix and Unix-like operating systems. It was developed by Alexander Lukyanov, and is distributed under the GNU General Public License. lftp can transfer files via FTP, FTPS, HTTP, HTTPS, FISH, SFTP, BitTorrent, and FTP over HTTP proxy.
A rule of thumb in determining if a reply fits into the 4xx or the 5xx (Permanent Negative) category is that replies are 4xx if the commands can be repeated without any change in command form or in properties of the User or Server (e.g., the command is spelled the same with the same arguments used; the user does not change his file access or ...
Requests the direct IP address of the user with the specified nickname. 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.
FileZilla Client allows file transfer using both FTP and encrypted FTP such as FTPS (server and client) and SFTP, [7] with support for IPv6. One of its most notable features is its capability to pause and resume file transfer processes, even for files larger than 4GB. Users can chose to overwrite existing files based on the age or size of the file.
Ban evasion can be detected by tracing a user's IP address. If two accounts are using the same IP address, it could be a sign of ban evasion. Also, the use of a VPN, shown by rapid, drastic changes of IP address by the same user in a short period of time, can also be a sign that the user was trying to get around a ban. Ban evasion can also be ...