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docs: add section about config file and network selection flags (#23146) 

Co-authored-by: Felix Lange <fjl@twurst.com>
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Sina Mahmoodi 2021-07-02 10:14:45 +02:00 committed by GitHub
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docs/_interface/peer-to-peer.md
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@ -3,6 +3,25 @@ title: Connecting To The Network
sort_key: B
---
If you start geth without any flags, it will connect to the Ethereum mainnet. In addition to
the mainnet, geth recognizes a few testnets which you can connect to via the respective flags:
- `--ropsten`, Ropsten proof-of-work test network
- `--rinkeby`, Rinkeby proof-of-authority test network
- `--goerli`, Goerli proof-of-authority test network
**Note:** network selection is not persisted in the config file. To connect to a pre-defined network
you must always enable it explicitly, even when using the `--config` flag to load other configuration values.
For example:
```sh
# Generate desired config file. You must specify testnet here.
geth --goerli --syncmode "full" ... dumpconfig > goerli.toml
# Start geth with given config file. Here too the testnet must be specified.
geth --goerli --config goerli.toml
```
## How Peers Are Found
Geth continuously attempts to connect to other nodes on the network until it has peers. If
@ -162,4 +181,4 @@ Nodes can be added using the `admin.addTrustedPeer()` RPC-call over the js conso
```js
admin.addTrustedPeer("enode://f4642fa65af50cfdea8fa7414a5def7bb7991478b768e296f5e4a54e8b995de102e0ceae2e826f293c481b5325f89be6d207b003382e18a8ecba66fbaf6416c0@33.4.2.1:30303")
```
```