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Thanks for your helpful answer! I just realized I had an incorrect understanding of how networking works. If I'm not mistaken now, is it true that connections over a subnet don't touch the router and rather pass through the best switch directly? I'm now trying to set up an iptables rule on the NAS itself, which does seem to have iptables installed and configured to work with Docker.
– Manchineel
Commented Nov 22, 2019 at 19:54
1

Yes. They might go through a router's built-in switch (most home routers have one, and that's what usually causes the confusion), but they don't actually go through the router's CPU. (Only packets with the router's MAC address as destination actually get delivered to the CPU for routing/filtering.)
– grawity_u1686
Commented Nov 22, 2019 at 21:04

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