Is it possible to run geth for ropsten and mainnet in a same server if I changed all the port for Ropsten node trying not to conflict the ports used in mainnet? For example, geth --rpcport 8546 --port 30301 --testnet (for Ropsten) and geth (for mainnet)? Thank you.


Yes you can. You must use different port and rpcport if you want to do this, just as you suggested.

geth --port 30303 --rpc --rpcport 8545 ...
geth --testnet --port 30304 --rpc --rpcport 8546....

Note: the port and rpcport in the first command are not necessary, as they are the default values. I have included them in order to be explicit.

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