this post was submitted on 17 Mar 2025
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How do you like to transfer large files between friends across the internet? (lemmy.world)
submitted 1 year ago* (last edited 1 year ago) by ReducedArc@lemmy.world to c/selfhosted@lemmy.world
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On occasion I find myself needing to send a file at least a few gigabytes in size to a friend across our slow ISPs but haven't found a satisfying solution. I usually end up creating a private torrent with the announce address of my own IP. Even though it's slow - it basically never reaches my max upload speed for some reason, it is at least resilient if there are ever any network glitches.

Does anyone else face this same challenge?

EDIT: Thank you for the awesome suggestions! I have some homework to do on these

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[–] brickfrog@lemmy.dbzer0.com 8 points 1 year ago* (last edited 1 year ago)

Syncthing is not just for LAN use. Even their homepage mentions transmitting data over the internet

https://syncthing.net/

I've been using it to sync devices over the internet for years. It's also how people use it to sync from say their desktop to their phones, remote server, etc.

If you watch your network firewall Syncthing does reach out to servers on the internet to help it find other devices so e.g. if you enter the other device's ID (example ABCDEFG-ABCDEFG-ABCDEFG-ABCDEFG-ABCDEFG-ABCDEFG-ABCDEFG-ABCDEFG) it can reach out over the internet to find that specific ID to pair with. I think Syncthing uses a sort of DHT resolver to find other devices, I know on my firewall I had to whitelist Syncthing's servers to make it work.

I was going to try to link you some references but their forums seem to have connection issues at the moment, you may want to search around later if you're interested how Syncthing works over the internet.