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Shunchao Hu
18cd40cd5d
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Update the NAT documentation to make the validation flow easier to follow. The existing document already contains useful details, but the test setup is hard to read for beginners. - In particular, the NuttX-side commands and Linux host commands can be confused - Some commands are redundant - Some required steps are missing - The Internet access example is not necessary for NAT behavior itself Simplify the validation case to use a local topology with Linux network namespaces. Add an ICMP test case and the required explanations around the NuttX iptables command and interface roles. Remove the IPv6 validation case from this doc, since the NAT66 flow follows the same structure as the NAT44 case. Signed-off-by: Shunchao Hu <ankohuu@gmail.com>