106
votes
Accepted
What happens when a transaction nonce is too high?
Summary
Transactions with too low a nonce get immediately rejected.
Transactions with too high a nonce get placed in the transaction pool queue.
If transactions with nonces that fill the gap between ...
- 40.1k
67
votes
Accepted
Which TCP and UDP ports are required to run an Ethereum client?
Ethereum clients use a listener (TCP) port and a discovery (UDP) port, both on 30303 by default.
If you need to run JSON-RPC, you'll also need TCP port 8545. Note that JSON-RPC port should not be ...
- 6,118
59
votes
Accepted
Why is the average block time 17 seconds?
Due to advances in blockchain research, it was shown that significantly lower block times were possible and perhaps beneficial given the current connectivity of the internet. One of the potential ...
- 9,560
35
votes
Why is my node synchronization stuck/extremely slow at block 2,306,843?
Update Mar 5 2017
The state cleaning was announced by Vitalik Buterin in the tweet State clearing 100% complete dated 23:07 Nov 29 2016. This time corresponds to block 2,718,436.
The Clearing ...
- 40.1k
30
votes
Accepted
How many nodes are there on the Ethereum network?
Disclaimer: I run ethernodes.org
There is a node explorer available at ethernodes.org which tries to estimate the number of nodes on the Ethereum network.
The estimation is based on an active ...
- 565
27
votes
Accepted
How do Ethereum mining nodes maintain a time consistent with the network?
Ethereum nodes (regardless of mining) need to have an accurate time, otherwise they will not be able to connect to peers and to the network (https://github.com/ethereum/go-ethereum/wiki/Connecting-to-...
eth♦
- 85k
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 ...
- 4,601
17
votes
Accepted
How to ask the metamask user to switch its network?
Here is an example how to make your website to ask the users so they can add and switch to the Matic network:
window.ethereum.request({
method: "wallet_addEthereumChain",
params: [{
...
- 3,386
15
votes
Accepted
Why doesn't my Ethereum node have any peers?
By default, geth uses port 30303 for connection to other nodes. You may need to modify your firewall to allow traffic over this port.
You can check your peer count as well as getting a list of peers ...
- 3,582
15
votes
Accepted
Why is the launch of homestead important?
The Ethereum project originally laid out a timeline of milestones representative of different states of the ecosystem. In brief, they are:
Frontier, a "wild west" stage with emphasized user caution
...
- 9,560
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 ...
- 6,118
14
votes
Accepted
How fast should be an internet connection to mine ETH?
How fast should be an internet connection to mine ETH?
I'm currently on a ~ 10 Mbits/s download and 1 Mbits/s upload line and it is fast enough to mine the Ethereum blockchain while performing my ...
- 40.1k
13
votes
Accepted
At any given time, how many nodes is my node connected to? As the number of nodes in the network increases, will communication between them be faster?
You can see the connected peers by typing admin.peers in the Geth console. The maximum number of peers is set using the -maxpeers n flag in Geth.
There is a discovery process based on Kademlia for ...
- 3,403
12
votes
Accepted
How to prevent being blacklisted for running an ethereum client?
You can tell parity to avoid scanning private IPs by simply running:
parity --allow-ips public
You can even fine-tune parity to do less aggressive peering:
parity --allow-ips public --no-discovery -...
- 32.8k
9
votes
How do Ethereum mining nodes maintain a time consistent with the network?
Here's the code I've found so far that deals with syncing time. It uses pool.ntp.org:123 as the time syncing source.
From Go Ethereum - p2p/discover/ntp.go, lines 48-65:
func checkClockDrift() {
...
- 40.1k
8
votes
How many nodes are there on the Ethereum network?
There are two tools which track running ether nodes available:
The etherchain node scanner.
The ethernodes scanner.
- 32.8k
8
votes
Accepted
Is there a point to hide Ethereum nodes with TOR?
If you want to conceal your node's network address as the source of your transaction, and thereby preventing others to associate your network address with your Ethereum address, then you might want to ...
- 3,018
8
votes
Accepted
How to connect an ethereum node to a random testnet?
For Geth you can connect to the public testnet (Morden) via:
geth --testnet
For other clients and for a full explanation plese refer to this wiki page: Ethereum wiki / Morden
If you don't want to ...
- 2,461
8
votes
Accepted
Peer discovery not working on private network
Each of the geth instances will need to discover at least one other instance with a connection to the rest of your private network.
You could nominate one (or more) of your geth instances as a ...
- 40.1k
8
votes
Why is my node synchronization stuck/extremely slow at block 2,306,843?
On a practical note, just remove your blockchain and synchronize again. The blockchain bloat has been removed already.
Stop your node and/or close your Ethereum wallet.
Remove the chaindata.
for ...
- 32.8k
7
votes
Accepted
How to connect NodeJS to the Ethereum network?
Ethereum offers a Web3 JavaScript Ðapp API
To make your Ðapp work on Ethereum, you can use the web3 object provided by the web3.js library. Under the hood it communicates to a local node through ...
- 9,663
7
votes
Accepted
Ethereum fork of OpenBazaar
Keep an eye on Safemarket.io: it is already deployed live on the Frontier network.
See getting started and releases.
Open source at https://github.com/safemarket
Subreddit at https://reddit.com/r/...
eth♦
- 85k
7
votes
Losing connection between nodes on private network
Summary
I would have expected that the bootnodes parameters would allow node 2 and node 3 to find node 1, node 2 and node 3 and then for all the nodes to retain their peer connections.
From Henrique ...
- 40.1k
7
votes
How fast should be an internet connection to mine ETH?
Mining itself doesn't use that much bandwidth, however syncing the block chain does. For syncing the blockchain using the --fast option it used about 12Gb(Initial sync) and about 100 mb the past 2 ...
- 312
7
votes
Accepted
Is it possible to prevent nodes from mining on a private blockchain?
What you are searching for is a permissioned blockchain. Default node clients like geth, eth or pyehtereum does not implement this kind of functionality, so you need something more complex that ...
- 5,069
7
votes
How to prevent being blacklisted for running an ethereum client?
I had a similar problem like you. Hetzner noticed that the abuse warning was triggered because the host tried to send tpc/udp packets to private network addresses (RFC1918). In order to avoid getting ...
- 7,519
6
votes
network port udp:30303 could not be mapped: no UPnP or NAT-PMP router discovered
On some rare setups UPnP lookup fails in a strange way that blocks up Geth. It was already fixed on develop and will hopefully land soon. Until that point if you experience this you might disable NAT ...
- 10.4k
6
votes
How many nodes are there on the Ethereum network?
Update. As of this morning (July 31, 2017), there were 21,349 nodes, according to Ethernodes. The Etherchain Node scanner which 5chdn listed as the other nodes tracker in his Feb. 2016 answer (https://...
- 2,259
6
votes
Accepted
Are there any alternative programmable networks to Ethereum?
Rootstock would be the main example, check out their site for more info
http://www.rootstock.io/
They use bitcoin instead of using their own coin, but they are not as far along with the smart ...
6
votes
How do Ethereum mining nodes maintain a time consistent with the network?
TL;DR: Blocks must be within reasonable Unix time or they will be rejected.
The yellow paper states:
timestamp: A scalar value equal to the reasonable output of Unix’s
time() at this block’s ...
- 11.6k
Only top scored, non community-wiki answers of a minimum length are eligible