port filtering

port filtering

Allowing or blocking network packets into or out of a device or the network based on their application (port number). See TCP/IP port and opening a port.
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In addition to full TCP/UDP offloading, this security module performs port filtering, blocking, monitoring and related functions in FPGA hardware thereby relieving CPU from these tasks.
According to Rackspace, the service offers flexible software-defined virtual networks, providing extra security through network isolation and port filtering.
such as port filtering and using a modem as a backup to your DSL line."