Requesting feature to whitelist/blacklist network interfaces and blacklist networks. I found IP network whitelist.
I have several links active which can communicate with peers (VPN, local, local ethernet, local wireless, LTE wireless, etc.). Considering Syncthing communicates securely and can transfer significant data, avoid VPN, LTE and/or wireless links.
Found related #10923 question, but refers to the IP network whitelist feature.