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add Discovery and basic faq

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Oskar Thoren 2019-08-27 13:12:28 +02:00
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@ -68,7 +68,18 @@ run these provided they are connected to the rest of the Whisper network.
### Discovery
<!-- TODO: Add a link to Discovery v5 / Rendezvous spec -->
To implement a Status client you need to discover peers to connect to. We use a
light discovery mechanism based on a combination of [Discovery
v5](https://github.com/ethereum/devp2p/blob/master/discv5/discv5.md) and
[Rendezvous Protocol](https://github.com/libp2p/specs/tree/master/rendezvous),
(with some
[modifications](https://github.com/status-im/rendezvous#differences-with-original-rendezvous)).
Additionally, some static nodes MAY also be used.
This part of the system is currently underspecified and requires further detail.
<!-- TODO: This section is way too vague, amend with concrete spec for how to do discovery of Status nodes. -->
<!-- TODO: Add info on peer list, Discover v5 timespan, static nodes etc - should be enough to discover nodes from a different stack -->
### Mailservers
@ -142,6 +153,16 @@ which is a prime target for Status clients.
This means the network is currently vulnerable to DDoS attacks. Alternative
methods of spam protection are currently being researched.
#### Why do you not use Discovery v5 for node discovery?
At the time we implemented dynamic node discovery, Discovery v5 wasn't completed
yet. Additionally, running a DHT on a mobile leads to slow node discovery, bad
battery and poor bandwidth usage. Instead, each client can choose to turn on
Discovery v5 for a short period of time until their peer list is populated.
For some further investigation, see
[here](https://github.com/status-im/swarms/blob/master/ideas/092-disc-v5-research.md).
## Footnotes
1. <https://github.com/status-im/status-protocol-go/>