[Ethereum] MetaMask and Access Ethereum Private Chain from other PC in the same network (for test)


My goal: To simulate the Ethereum blockchain with different clients. So, they create their own accounts, i.e. public/private keys, and store them locally. So all are for testing.

Assume, I have set up a private chain on computer A. Can I install MetaMask on computer B, and connect to computer A's private chain?

If YES, how can I do that?

If NO, how can I connect two nodes (each on a different machine and having the regular IP address, not a static one) so they can connect to the private chain with a minimal setup?

Best Answer

You can do it with using both ways, having the two computers networked together.

Using Metamask;

select network as Custom RPC put the custom url as http://[ComputerA's ip address]:[rpc port]


If computer A's ip address is and rpc port is 8545 then use,

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Using web3;

As one of your own questions How can I connect my HTML user interface to my Ethereum private chain? you can use

web3 = new Web3(new Web3.providers.HttpProvider("http://localhost:8545"));

with the slight change of; instead localhost replace the ip address of the other computer (in your case computer A's ip address in the LAN) and the 8545 with port number.


If computer A's ip address is and rpc port is 8545 then use,

web3 = new Web3(new Web3.providers.HttpProvider(""));

EDIT: It's needed to have RPC enabled in the computer A allowing the computer B to access it with

--rpc --rpcport "8545" --rpccorsdomain "[commputer B's ip address OR *]" --rpcaddr "[computer A's ip address]" 
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