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Grokking NAT and packet mangling in Linux
viveknathani - blog
If a host sends a packet with the same source IP address and port number to a different destination, a different NAT mapping is used. Router operating system projects like OpenWrt use linux under the hood, specifically the nftables module. Since NAT is about manipulating IP addresses and ports, it only makes sense to talk about it when TCP and UDP are involved.
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