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Middle-Boxes.md

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Middle Boxes

Middle Boxes

  • These are extra devices that interact with IP packets when they are getting transported by a layer.
  • Most of these are found on network layer and transport layer.
  • One that is connected to the global network and the other is connected to local network.

Firewall

  • This is a type of middle box.
  • This filters out IP packets on the basis of some rules.
  • These type of middle boxes are found on the end devices and on the network.

Stateless Firewall

  • This firewall does not keep any state about the packets.
  • Stateless firewall is not efficient.

Stateful Firewall

  • This maintains state of the IP packets.
  • This stores IP packets into cache.
  • This is efficient because it maintains cache.