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NAT type

Hard

Easy

None (WAN)

Hard

Very unlikely

Possible

Yes

Easy

Possible

Yes

Yes

None (WAN)

Yes

Yes

Yes

And a network diagram:

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How do I know if I’m behind a Difficult NAT?

Check zerotier-cli info -j and look at the surfaceAddresses. If that list is growing, you may be behind a difficult NAT.

See also:

Router Configuration Tips

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