Will be one syncthing node acting like a "private" relaying server?

Assuming I have three syncthing nodes A, B and C sharing files with each other. A and B are behind different NAT networks, C has public IP. Normally the connections between A and B would require relaying servers. My question is: since both A and B are able to connect to C directly, will be A-B connection still seeking for another relaying server, or C acting like one thus relaying server no longer needed (as long as C is online)?

It will still seek direct connection between A and B as they are added to each others device list. If you want to use C as your transport between A and B, remove the link between them, yet sync between A and B will not start until C has the files.

You could also run a relay on C yourself.

Thank you, I understand now.

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