As far as I know, the default test network is "Ropsten" and you can connect to ropsten with following command.Since it is default, when you connect to testnet its "Ropsten".

geth --testnet

I would like to connect "Kovan" / "Rinkeby" test networks. What are the required parameters connecting to these test networks?

  • Because rinkeby does not enter ico, like eth in your normal network. Where is it possible to sell rinkeby, in which ico? – Javi Oct 4 '17 at 15:23

For rinkeby, just type geth --rinkeby from command prompt and you're in

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For Kovan:

parity --chain kovan

it won't be possible to connect to Rinkeby with parity, only with geth.

Rinkeby with geth:

geth --rinkeby
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  • How to connect to Kovan with geth? – Ini May 3 '18 at 22:06
  • that's just not possible to do. – rstormsf May 8 '18 at 20:28
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    @Ini it's not possible because Kovan and Rinkeby were started by separate groups. That is, Kovan is Parity's project while Rinkeby is go-ethereum team's. – Paul Razvan Berg Oct 17 '18 at 15:32

You have to use either the --chain or --networkid options, depending on your client.

The Kovan network is only available when using the Parity client.

From the Parity --help output:

--chain CHAIN Specify the blockchain type. CHAIN may be either a JSON chain specification file or olympic, frontier, homestead, mainnet, morden, ropsten, classic, expanse, testnet, kovan or dev (default: homestead).

The Rinkeby network is only available when using the Geth client.

From the Geth --help output:

--networkid value Network identifier (integer, 1=Frontier, 2=Morden (disused), 3=Ropsten, 4=Rinkeby) (default: 1)

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geth --rinkeby --syncmode "fast" --rpc --rpcapi db,eth,net,web3,personal --cache=1024 --rpcport 8545 --rpcaddr --rpccorsdomain "*"

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