The most common use case for tunnels is to connect remote, geographically separated sites over an existing network, most notably routing over a public infrastructure (such as the Internet). The network infrastructure doesn’t support the traffic type (multicast or broadcast).The network infrastructure cannot route the packets due to lack of routing information or addressing types (public addressing vs.The network infrastructure doesn’t support the protocol being used.There are several reasons why this may be: ![]() Tunnels provide a way to transport protocols that the underlying network does not support. ![]() I will also address certain pitfalls encountered while implementing GRE tunnels, beginning with a basic overview of tunneling. With this blog, I hope to explain and demonstrate the basic configuration required to form GRE tunnels with specific use cases in mind.
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