The chains and their uses are:
- PREROUTING: Touches packets before they are routed
- INPUT: Touches packets once they are determined to be destined for the local system but before they are received by the control plane software
- FORWARD: Touches transit traffic as it moves through the box
- OUTPUT: Touches packets that are sourced by the control plane software before they are put on the wire
- POSTROUTING: Touches packets immediately before they are put on the wire but after the routing decision has been made
REF: https://docs.cumulusnetworks.com/m/view-rendered-page.action?abstractPageId=5866550
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