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| # Tansa: LAN service discovery over IPv6 multicast | ||
| # Tansa: Serverless LAN service discovery over IPv6 | ||
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| [](https://codecov.io/github/seamlik/tansa) | ||
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| This project is an opinionated solution of multicast discovery. | ||
| This project is an opinionated solution of service discovery within a IPv6-enabled LAN. | ||
| Written in pure Rust, it is [cross-platform](https://doc.rust-lang.org/nightly/rustc/platform-support.html) and is suitable to be a unified and portable solution for an application planning to span all major devices like laptops, smartphones and more. | ||
| Unlike solutions such as [DNS Service Discovery](http://dns-sd.org), | ||
| applications using this solution do not rely on any server/daemon running on the operating system. | ||
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| This project offers both a crate and a CLI application. | ||
| However, I will not publish it to any public registry since it is highly experimental. | ||
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| ## Technologies under the hood | ||
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| ### Multicast | ||
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| Service discovery is mostly implemented by exchanging multicast packets on a rendezvous address. | ||
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| ### IP neighbors | ||
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| When multicast is unavailable, services on other devices are naturally undiscoverable. | ||
| However, devices connected directly to the host device are still discoverable as IP neighbors. | ||
| Applications can still communicate with each other but over link-local addresses. | ||
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| This scenario can happen, for example, when 2 Android smartphones are connected via a hotspot or even Wi-Fi Direct. | ||
| In this case, no other device exists within the LAN, but applications on the smartphones can still communicate. | ||
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| This feature relies on the operating system. Current we support these operating systems: | ||
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| * Windows (using [PowerShell](https://learn.microsoft.com/powershell/module/nettcpip/get-netneighbor?view=windowsserver2022-ps)) | ||
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| ## Project name meaning | ||
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| Based on Japanese 探索 with pronounciation "tansaku" meaning "discovery". | ||
| Based on Japanese "探索" with pronounciation "tansaku" meaning "discovery". |