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My router has this feature under port forwarding. Is it safe to enable it?

Freedo
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  • Inherently, not. But it is very broad thing and it depends on the circumstances. Is the color of my cap a security risk? It might be - for example, if I sign with it to the laser interferometry eavesdroppers in the next building, which windows should they target with their device. – peterh Aug 06 '18 at 18:40

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Hairpin NAT just means that the external IP of the NAT router is also accessible from the internal IP address - see Wikipedia for more details. While one might probably construct an unusual use case where hair pinning is a security problem it is not a security problem in the usual use cases. Still, if you don't need this option you might just leave it off.

Steffen Ullrich
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