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I'm reading GETH Command-Line Options Guide, which says:

--testnet            Ropsten network: pre-configured proof-of-work test network
--networkid value    Network identifier (integer, 1=Frontier, 2=Morden (disused), 3=Ropsten, ...)

What exactly is the difference between --testnet and --network 3?

Do I have to use both, or can I use either one?

Thank you!

1 Answer 1

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Each network has an ID and a name.

The network ID of Ropsten is 3.

The network ID of the Main Network is 1.

--network 3 evaluates to Ropsten, which also happens to be the default test network in the GETH client.

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  • Do I have to use both, or can I use either one? Commented Jun 27, 2018 at 21:03
  • You can use either one.
    – Soggiorno
    Commented Jun 27, 2018 at 21:06

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