How Do Routers Work, Really?

Re:How Do Routers Work, Really? by josteink on Thursday September 10, 2020 @04:29PM (#24436259)

> The IP stack has the concept of layers, which function as abstractions that hide the implementation of lower layers from the upper layers

Correction: the network stack has layers, where IP is one of them, near the top.

Which is why most software targets IP. It’s a good abstraction and it’s portable.

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Re:How Do Routers Work, Really? by cameronh90 on Thursday September 10, 2020 @05:51PM (#24436918)

GP may be referring to the "TCP/IP model" which does indeed define the layers used in common parlance. This model has 4 layers in contrast to the OSI model's 7 layers. The TCP/IP model is closer to how most real life network stack implementations are defined.

Arguably even this layering system is too rigid for reality but it's a decent model. See RFC 3439 section 3.

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