Unable to start connection via local network

[lloyd-fftrf]

I'm currently experiencing some difficulties enabling connection between my iOS Synctrain and Windows Syncthing.

For my use case, I only want to sync a folder between my iOS and Windows. This folder is not updated frequently and I'm fine with starting Synctrain once in a while just to sync the files. I also prefer using only local connection to sync between my two devices.

Here's my configuration:

1. Both device is on the same wifi network
2. Synctrain advanced settings
   • ✅ Listen for incoming connections
   • ✅ One connection is enough
   • ✅ Announce on local network
   • ❌ Announce LAN addresses
   • ❌ Announce globally
   • ❌ Enable relaying
   • ❌ Enable NAT-PMP /UPnP
   • ❌ Enable STUN
3. I'm using dynamic addresses for both Windows and iOS Syncthing

My problem is that I can't seem to connect my Windows and iOS using this configuration. I usually need to enable Announce globally and Enable relaying before the two device is connected. After connected once, I can disable Announce globally and Enable relaying and my Windows Syncthing will show connected via LAN, which is what I want. However, I feel like I shouldn't need to enable the global announce and relaying to connect between two devices in the same network? Does anyone know what is wrong with my settings?

The issue will come back after not making connection between devices for a long time, then I need to enable Announce globally and Enable relaying again before it can work normally.

Thanks

[pixelspark]

Have you tried with 'announce LAN addresses' enabled?

You want your devices to connect locally, so they must somehow learn each others local IPs. If you enable local announce, they will broadcast their IPs locally, but (afaik) only their non-local IPs until you enable 'announce LAN addresses'.

Also please verify if multicast/broadcast is allowed on your LAN. Notably some wifi APs have L2 isolation turned on.

Also consider giving the devices fixed local addresses and add those in the device settings. This should connect basically instantly, it needs no discovery.

[lloyd-fftrf]

Hi Tommy,

Changing the addresses from dynamic to fixed IP does make the devices connect instantly. Thank you for the support.