Understanding Packet Forwarding vs Local Delivery Network Routing
In computer networking, packets are the basic units of data that are transmitted between devices. When a packet is received by a device, it must decide what to do with it. There are two main options: packet forwarding and local delivery network routing. This article will explore these two concepts in detail, including their key differences, subtopics, and references.
Packet Forwarding
Packet forwarding is the process of forwarding a packet from one device to another based on the packet's destination IP address. This is typically done by a router, which is a device that connects different networks together. When a router receives a packet, it examines the packet's destination IP address and consults its routing table to determine the best path to forward the packet. The router then forwards the packet to the next hop on the path, which may be another router or the final destination device.
Local Delivery Network Routing
Local delivery network routing, on the other hand, is the process of delivering a packet to a device on the same network as the router. This is also known as direct delivery. When a router receives a packet, it checks the packet's destination IP address to see if it is on the same network as the router. If it is, the router will deliver the packet directly to the destination device. If the destination IP address is not on the same network, the router will forward the packet to the next hop on the path to the destination network.
Key Differences
The key difference between packet forwarding and local delivery network routing is the destination of the packet. With packet forwarding, the packet is forwarded to another device on a different network. With local delivery network routing, the packet is delivered directly to a device on the same network as the router.
Subtopics
Linux kernel receives packet- Pre-routing chain
- Routing decision
- Forwarding packet somewhere else
- Delivering packet locally
References
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Article: Configuring IP Routing in Cisco IOS: FIB Tables and Forwarding
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Online Resource: What is Packet Forwarding?
Packet forwarding and local delivery network routing are two fundamental concepts in computer networking. Understanding these concepts is essential for anyone who wants to design, implement, or troubleshoot networks. By understanding the key differences between packet forwarding and local delivery network routing, as well as the subtopics and references covered in this article, you will be well on your way to mastering these important concepts.
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