Ethereum: Cannot call rpc api from other machine in same local network

Ethereum: Impossible to call the RPC API of another machine in the same local network

As an Ethereum developer, you probably know the importance of interacting with your blockchain network using the remote procedure call (RPC). However, a common challenge occurs when you try to call the RPC APIs on a node running in the same local network as another machine. In this article, we will explore why this problem occurs and provide possible solutions.

The problem:

When you run a regret node in your local network, it is an autonomous environment that runs an Ethereum node with limited access controls. However, when you try to call RPC APIs from other machines on the same local network, you meet an obstacle.

More specifically, the `rpCallowip 'option is deactivated by default for the regtest nodes running in the same local network. This means that when you try to make requests to the Ethereum node from another machine using RPC, you will get an error.

TheRPCALLOWIPoption:

In Ethereum Core 1.x and earlier, theRPCALLOWIP option” controls access authorizations for RPC APIs on your node. When defined on “True”, it allows RPC calls from outside the local network (that is to say another machine). However, in regtest mode, this option is deactivated by default.

Why does it happen?

The reason for this behavior lies in the Ethereum architectural and safety constraints. By design, regtest nodes are isolated environments that do not need to interact with external networks. As such, they are not linked by the same access authorizations as production nodes.

When you run a regtest node on your local network, it runs an internal testnet body which does not require RPC calls outside the network. Therefore, the `rpCallowip 'option is deactivated to prevent unauthorized access.

• Use a different network:

  

  If you have to interact with the Ethereum node from another machine in the same local network, consider using a different network (for example,rpcuseror rpcpassword). You can then use these options instead of “RPCALLOWIP”.

• Define rpCallowip to True: on your regtest node, you can define rpcalylowipto true 'before executing it in the same local network:

bash

'

• Use a different RPC API: Consider using the methodsEth_GeteveVentaddress’ ouETH_Call»

WhileRPCALLOWIP` is intended to control the access authorizations for RPC APIs on your node, its default behavior in regtest mode prevents interactions with other machines on the same local network. By understanding why this happens and implementing one or more of these solutions, you should be able to successfully call the RPC APIs of other machines of the same local network.

In doing so, you will unlock new possibilities for development, tests and exploration in your Local Ethereum ecosystem!

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