22
votes
What is an Enode ID in Ethereum?
An enode is a way to describe an Ethereum node in the form of a URI.
The hexadecimal node ID is encoded in the username portion of the URL, separated from the host by an @ sign. The hostname can only ...
- 4,621
14
votes
Accepted
What is an Enode ID in Ethereum?
Expanding on Hudson Jameson's answer: "The hexadecimal node ID is encoded in the username portion of the URL"
The username portion is a 512-bit public key that is used to verify communication came ...
- 6,138
12
votes
Accepted
Why does Ethereum require use of UDP (and not TCP) for discovery?
UDP-based discovery is one of the main paradigms of peer discovery.
For example, Universal Plug and Play (UPnP) uses the UDP-based Simple Service Discovery Protocol (SSDP), and BitTorrent has a UDP-...
- 37.9k
8
votes
Automatic peer discovery in a private blockchain
No, there is no peer discovery methods other than modifying the boot nodes.
The IP addresses are configured in the source code of the clients. If the IP changes, the list of the last bootstrap node ...
- 9,673
6
votes
How does Ethereum client select which peers to synchronise with?
Only a partial answer for the first couple of sub-questions...
How many nodes do we connect to?
The maximum number is set to 25 by default, but can be configured using the --maxpeers flag on the ...
- 37.9k
5
votes
Accepted
Why is Geth trying to connect to private network IP addresses (RFC1918)
I have the same issue but with parity on a Hetzner server.
Is this a part of the node discovery protocol? It would only make sense, if geth would be assuming that there are other nodes in the local ...
- 32.9k
4
votes
Automatic peer discovery in a private blockchain
In a private chain the discovery protocol didn't work.
you have one of 2 options use --bootnodes or a static file /static-nodes.json where you store your nodes.
Idea : you could write a simple code ...
- 18.8k
3
votes
Accepted
Best Discovery Protocol implementation
You can use implementations of existing clients:
Besu - Java implementation
Geth - Go implementation
Parity1 - Rust implementation
1 At this point, I would be careful to use Parity's implementation ...
3
votes
Accepted
How to get Nodes on local Geth Private Network to Discover Peers OF THEIR PEERS
Bootnodes is a cheap and effective solution to aid the network self-discovery, but they need to catch up with a proper genesis file to isolate your network.
When you run geth, the genesis block is ...
- 301
3
votes
How Geth and Parity resolve timestamps when validating block headers?
I doubt there has ever been an actual case of this happening (don't quote me on that unless you also quote that I said not to quote me on it). In order for a block to be valid by Parity and not valid ...
- 12k
2
votes
Sharing enodeURLs on a private blockchain
I'd consider using a distributed key-value store such as ETCD (https://coreos.com/etcd/docs/latest/getting-started-with-etcd.html). You could set up an ETCD alongside ethereum and share arbitrary data ...
- 161
2
votes
Accepted
Discovery Protocol Broadcasting
Correct. Ethereum node discovery works by nodes gossiping enode addresses between each other, so you have to connect to at least one node manually. The mainnet/testnets get around this inconvenience ...
- 12k
2
votes
How Geth and Parity resolve timestamps when validating block headers?
Just brainstorming here but I guess the reason block times are accurate is for the same reason the miners agree on all of the other parameters a block must have.
Eg they agree that they pay 3 Eth, at ...
- 1,658
2
votes
Accepted
How many nodes does Geth attempt to connect to by default?
Geth attempts to connect to 25 peers by default, as stated on the CLI commands page.
This can be changed with:
--maxpeers value Maximum number of network peers (network disabled if set to 0) (...
- 18k
2
votes
Accepted
How to retrieve IP address and Port from Ethereum Node Records (ENR)?
There is also a rust enr-cli library to assist with decoding ENR strings.
You can install it via cargo install enr-cli --version 0.1.0-alpha
An example of its use is:
$ enr-cli -e -...
- 36
1
vote
How to retrieve IP address and Port from Ethereum Node Records (ENR)?
You can use the enr library (written in rust).
use enr::Enr;
fn main() {
let enr_string = "-Iu4QGuiaVXBEoi4kcLbsoPYX7GTK9ExOODTuqYBp9CyHN_PSDtnLMCIL91ydxUDRPZ-jem-...
- 439
1
vote
Bootnode Discovery with external IPs instead of local ones
So here is how I solved my issue. I host my kubernetes cluster in google cloud, but the same concepts should apply to any provider.
First I created the clusters within a predefined VPC with subnets. ...
- 111
Only top scored, non community-wiki answers of a minimum length are eligible