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More hosts can be specified with the command: /usr/sbin/tcpkill −9 host www.google.com and host www.yahoo.com. To block well−known ports e.g., napster (port 8888 and port 6699) or gnutella (port 6346), the command: /usr/sbin/tcpkill −9 port 8888 and port 6699. or /usr/sbin/tcpkill −9 port 6346
To enable the forwarding of User Datagram Protocol (UDP) broadcasts, including BOOTP, received on an interface, use the ip helper-address command in interface configuration mode. To disable the forwarding of broadcast packets to specific addresses, use the no form of this command.
The port numbers in the range from 0 to 1023 (0 to 2 10 − 1) are the well-known ports or system ports. [3] They are used by system processes that provide widely used types of network services. On Unix-like operating systems, a process must execute with superuser privileges to be able to bind a network socket to an IP address using one of the ...
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 ...
The compatibility issue still exist since the introduced of the IGDv1 client in Windows XP in 2001, and a IGDv2 router without a workaround that makes router port mapping impossible. [ 8 ] If UPnP is only used to control router port mappings and pinholes, there are alternative, newer much simpler and lightweight protocols such as the PCP and ...
In computer networking, port knocking is a method of externally opening ports on a firewall by generating a connection attempt on a set of prespecified closed ports. Once a correct sequence of connection attempts is received, the firewall rules are dynamically modified to allow the host which sent the connection attempts to connect over specific port(s).
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Streamlined FTP Command Extensions: Get the available space CCC RFC 2228 Clear Command Channel CDUP RFC 959 Change to Parent Directory. CONF RFC 2228 Confidentiality Protection Command CSID Streamlined FTP Command Extensions: Client / Server Identification CWD RFC 697 Change working directory. DELE RFC 959 Delete file. DSIZ