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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).
Door knocker, item of door furniture that allows people outside to alert those inside; Knocker-up, profession in England and Ireland before alarm clocks were affordable or reliable; Port knocker, to externally open ports on a firewall; Sanctuary Knocker, ornamental knocker on the door of a cathedral
Pork-knocking is extremely hazardous and deaths are not uncommon. Miners were crushed under falling trees, earth, and rock. [7] Drowning often occurs as mining operations are typically based on rivers to capture gold and diamond-laden sediments. The remoteness and wild terrain are a challenge for receiving emergency medical care. [3]
bosun's call. See boatswain's call. bosun's chair. See boatswain's chair. bosun's pipe bosun's whistle. See boatswain's call. bottlescrew A device for adjusting tension in stays, shrouds and similar lines. [2] bottom 1. The underside of a vessel; the portion of a vessel that is always underwater. 2. A ship, most often a cargo ship. 3. A cargo hold.
Car knocker Railroad car repair-person or car inspector. The term is derived from a worker who taps or "knocks" on railroad equipment to check its soundness. [62] Centennials Union Pacific's EMD DDA40X locomotives. World's most powerful diesel locomotives, delivered in 1969, the year of Union Pacific's centennial. [63] Centipede
A dockworkers strike at ports across the country could pose delays to the U.S. supply chain, experts say. The strike — which has shut down 14 ports along the East and Gulf coasts on Tuesday, Oct ...
A door knocker is an item of door furniture that allows people outside a house or other dwelling or building to alert those inside to their presence. A door knocker has a part fixed to the door, and a part (usually metal) which is attached to the door by a hinge, and may be lifted and used to strike a plate fitted to the door, or the door itself, making a noise.
The Knocker, Knacker, or Tommyknocker (US) is a mythical, subterranean, gnome-like creature in Cornish and Devon folklore. The Welsh counterpart is the coblyn. It is closely related to the Irish leprechaun, Kentish kloker and the English and Scottish brownie. The Cornish describe the creature as a little person 2 ft 0 in (0.61 m) tall, with a ...