GRE and IP in IP Tunnels

GRE is a tunneling mechanism able to transport packets of one protocol within another protocol. The passenger protocol is the protocol carried, and the transport protocol is the protocol that is used for carrying the passenger protocol. GRE uses IP as the transport protocol and can be used for carrying many different passenger protocols (IPv4, IPv6 or non-IP protocols such as CLNS or IPX).

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VLANs, Trunks, Port Types and Interfaces

The aim of this post is to explain basic concepts in the networking field such as Virtual LANs (VLANs), Port Types and Interfaces.

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