this post was submitted on 28 Jun 2026
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Modern routers have a feature that's typically known as "hairpin NAT" or "NAT loopback". This means that if the DNS lookup resolves to the router's public IP, it routes the packet internally instead of passing it out to the internet. So for your subdomains all of the traffic should stay local. Typically this feature is enabled by default, but you may want to check just to be sure.