> ## Documentation Index
> Fetch the complete documentation index at: https://gloflow.org/llms.txt
> Use this file to discover all available pages before exploring further.

# Forum comments

[https://github.com/libp2p/go-libp2p-kad-dht/issues/147](https://github.com/libp2p/go-libp2p-kad-dht/issues/147)

# libp2p DHT modes - Client/Server

* Client mode is default

* Well, it really query-only mode (mostly) versus full mode. The active side is actually the "client" (making requests), the "server" just responds to requests.

* Given enough bad nodes, a DHT becomes unusable.

* we have a ton of nodes behind NATs
  1. Make outbound connections to insert themselves into the DHT.
  2. Cannot accept inbound connections, making it hard to actually traverse the DHT.

* nodes behind NATs won't be pingable (so they'll be dropped from routing tables pretty quickly).

* clients are "passive" nodes, this is how it's done in BitTorrent.

* DHT nodes that have just started may not provide particularly useful responses to some queries

* [https://github.com/libp2p/go-libp2p-kad-dht/issues/349](https://github.com/libp2p/go-libp2p-kad-dht/issues/349)
  * The DHT needs the ability to switch between server and client mode.
    * If a peer becomes undialable for some reason, they should move to being only a client, but if a peer becomes dialable and suitable for being a full dht node, they should be able to without rebooting.

# libp2p functions to use:

> // returns the diversity stats for the Routing Table.\
> IpfsDHT.GetRoutingTableDiversityStats()

> // allows introspection of the operation mode of the DHT\
> // Client & Server modes; Server mode allows for answering queries\
> IpfsDHT.Mode()

> // looks for a peer with a given ID connected to this dht and returns the peer and the table it was found in\
> IpfsDHT.FindLocal(id peer.ID) peer.AddrInfo

> host.Peerstore().Peers()

# AutoNAT

# libp2p RPC

* github.com/libp2p/go-libp2p-gorpc
* provides RPC support on top of libp2p in the same way that net/rpc does on HTTP

# Third-party tutorials

* [https://ldej.nl/post/building-an-echo-application-with-libp2p/](https://ldej.nl/post/building-an-echo-application-with-libp2p/)

# libp2p concepts

* Host
  * contains all the core functionalities you require connecting one peer to another
  * contains *ID*, which is an identity of the peer

* Stream
  * communication channel between two peers

* Peerstore