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Update AWDL posts, include OWLink URLs

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Neil Alexander 2019-11-25 11:22:31 +00:00
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21
_posts/2019-08-19-awdl.md
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@ -9,10 +9,13 @@ author: Neil Alexander
I was mostly prompted to write this post in response to a [Hacker News
thread](https://news.ycombinator.com/item?id=20735462) recently, which announced
the release of an open-source implementation of the Apple Wireless Direct Link
(AWDL) protocol. AWDL is the secret sauce behind AirDrop, peer-to-peer AirPlay
and some other Apple wireless technologies. Even though everything covered in
this post was done some time ago, I have never spent the time to document it.
the release of an [open-source AirDrop implementation called
OpenDrop](https://github.com/seemoo-lab/opendrop) from the same team who
produced an [open-source implementation of Apple Wireless Direct Link (AWDL)
protocol called OWL](https://github.com/seemoo-lab/owl). AWDL is the secret
sauce behind AirDrop, peer-to-peer AirPlay and some other Apple wireless
technologies. Even though everything covered in this post was done some time
ago, I have never spent the time to document it.
With a few exceptions, most wireless networks in the world operate in
"infrastructure mode" which is where a wireless access point serves one or more
@ -48,6 +51,13 @@ These "hops" between wireless channels happen so quickly that there's very
little disruption to what the user is doing with their Wi-Fi connection already
(except for some minor wireless performance degradation - to be covered later).
A number of papers have been published by the OWLink team on the inner workings
of the AWDL protocol, which can be [found
here](https://owlink.org/publications/). In particular, [this
paper](https://arxiv.org/pdf/1808.03156.pdf) from Mobicom 2018 contains a
significant amount of detail about the AWDL protocol itself, channel hopping
techniques and security considerations, amongst other things.
### Mesh opportunities
Yggdrasil is designed to create a mesh network automatically out of
@ -69,7 +79,8 @@ configuration options, and it should scale well too in principle.
Yggdrasil can already discover potential peers on the same network segment by
using multicast service discovery, which sounds a lot like what AWDL does on the
social channel. You can configure which interfaces Yggdrasil beacons on with the `MulticastInterfaces` configuration directive.
social channel. You can configure which interfaces Yggdrasil beacons on with the
`MulticastInterfaces` configuration directive.
I wanted to know if we could blend the two so that Yggdrasil could automatically
discover other nearby devices and initiate peering connections with them using