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Dropbox LAN Sync
Dropbox LAN Sync utilizes TCP and UDP port 17500 to efficiently synchronize files between Dropbox clients on the same local network, enabling accelerated file sharing without relying solely on internet connectivity..
Dropbox LAN Sync is a feature integrated into the Dropbox client application that optimizes file synchronization within a local network environment. This mechanism helps reduce external bandwidth consumption by transferring files directly between devices connected to the same network.
The protocol employs UDP port 17500 initially for discovery purposes. When a Dropbox client is active, it sends broadcast packets to the local subnet over UDP. Other Dropbox clients listening on the same port receive these packets and, if associated with the same account, acknowledge their presence. This mutual awareness facilitates the direct exchange of files.
Following the discovery process, Dropbox clients establish TCP sessions over port 17500 to handle the actual file transfers. This direct connection method ensures higher data integrity, reliability, and faster synchronization compared to routing data solely through Dropbox's cloud servers. By offloading local file transfers to the LAN, Dropbox LAN Sync enhances performance and efficiency for collaborative, multi-device Dropbox users.