via CB5 Blog | Follow the Bouncing Packet

One understanding that I think has helped me a great deal in troubleshooting problems, and designing networks and services is the evolution of a network packet as it transverses different pieces of network hardware. Today I will try to cover at a high level, the packet creation process, switching to the local Vlan, packet routing, NATing and firewalls, and VPN IPSEC encapsulation. During this discussion we will track the changes to a network packet in the IP and TCP/UDP headers.

This will be a multipart article and we will start by going over some prerequisites for understanding. This article is written to server admins, and so a deep technical knowledge is not required. If you understand the basics of server administration and the data contained in the prerequisite section I believe you will be able to comprehend, and find this article helpful.

• Part1: Prerequisites
• Part2: Packet Formation
• Part3: Switching
• Part4: Routing
• Part5: Firewalls
• Part6: VPN Tunnel
• Part7: NAT and PAT
• Part8: End-to-End, B-to-A

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