From: BitTorrent Sync FAQ *unofficial* " Can I force Sync to do local network (LAN) syncing only and not sync via the Internet? Yes - simply disable the Relay, Tracker, and DHT options (these are per-folder settings). Sync will then no longer connect to any remote devices (outside your local network). " I've noticed that, even with Relay, Tracker, and DHT disabled, and only using the Search LAN option, if there is one device on the LAN that can contact the outside "swarm" it seems to exchange the peer information and try to connect to the WAN and the LAN clients. Normally this isn't an issue of course, but since connections seem to be attempted from the WAN clients, and I've noticed that WAN clients sometimes show data being uploaded directly to a "non-public" LAN client, while the "non-public" LAN client shows no downloading data from remote peers. My use case, is I have a Small NAS that acts as a local backup to my server, the server has ports forwarded, and it is public to the swarm, but the NAS doesn't have ports forwarded, and only has "Search LAN" as the Share option. Both the NAS and WAN peers show each other in their client list, but no data can come into the NAS from the WAN peers, (since the ports are not forwarded) I could just forward ports for the NAS, and allow both the Server and the NAS public access. but then the upload and download gets messy since my connection is SLOW..... I also realize that I can just set the download and upload rates in the NAS to 1kbps, (since 0 is unlimited), and since I can set the NAS to disable LAN rate limits, it should work fine, but on the PPC build of syncapp, i've noticed it seems like the "rate limit local peers" option might be ignored. Of course that could be an issue with how syncapp decides something is local, or a complication with the WD MyBookLive config, But anyway.... I guess a "Disable PEX" option would fix it, but I assumed that since "Search LAN" was the only option enabled it, that it would only connect to Local Peers. I guess the other option is a "Only Connect to Local Peers" option would work too..... Danke fur alles, und guten nacht