Syncthing will automatically switch from relaying to direct device-to-device connections if it discovers that a direct connection has become available. Private relays can also be set up and configured, with or without public relays, if desired. The relaying performed is similar in nature to the TURN protocol, with the traffic TLS-encrypted end-to-end between devices (thus even the relay server cannot see the data, only the encrypted stream). The network of community-contributed relay servers allows devices that are both behind different IPv4 NAT firewalls to be able to communicate by relaying encrypted data via a third party. The project also provides the Syncthing Discovery Server program for hosting one's own discovery servers, which can be used alongside, or as a replacement of the public servers. Infrastructure ĭevice discovery is achieved via publicly-accessible discovery servers hosted by the project developers, local (LAN) discovery via broadcast messages, device history and static host name/addressing. Moving and renaming of files and folders is handled efficiently, with Syncthing intelligently processing these operations rather than re-downloading data from scratch. Two different SHA256 hashing implementations are currently supported, the faster of which will be used dynamically after a brief benchmark on start-up. Syncthing offers send-only and receive-only folder types where updates from remote devices are not processed, various types of file versioning (trash can, simple or staggered versioning as well as handing versioning to an external program or script) and file/path ignore patterns. GUI Wrappers can use these files to present the user with a method of resolving conflicts without having to resort to manual file handling.Įfficient syncing is achieved via compression of metadata or all transfer data, block re-use and lightweight scanning for changed files, once a full hash has been computed and saved. Ĭonflicts are handled with the older file being renamed with a "sync-conflict" suffix (along with time and date stamp), enabling the user to decide how to manage two or more files of the same name that have been changed between synching. All data, whether transferred directly between devices or via relays, is encrypted using TLS. Devices connecting to each other require explicit approval (unless using the Introducer feature) which increases the security of the mesh. It supports IPv6 and, for those on IPv4 networks, NAT punching and relaying are offered. Syncthing is a BYO cloud model where the users provide the hardware that the software runs on. Syncthing is written in Go and implements its own, equally free Block Exchange Protocol. Data security and data safety are built into the design of the software. It can sync files between devices on a local network, or between remote devices over the Internet. Syncthing is a free, open-source peer-to-peer file synchronization application available for Windows, macOS, Linux, Android, Solaris, Darwin, and BSD. English, German, Greek, Spanish, French, Italian, Polish, Portuguese, Russian, Swedish, Norwegian
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