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Built-in Chains
Three built-in chains in the nat table
- PREROUTING - DNAT
- POSTROUTING – SNAT, port mapping, redirection
- OUTPUT – for firewall generated traffic
Two built-in chains in the mangle table
- PREROUTING – change in-coming packet headers
- OUTPUT – change firewall generated packet headers
Three built-in chains in the filter table
- INPUT – packets destined for the device
- OUTPUT – packets originating from the device
- FORWARD – packets being routed by the device
Notes: