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When running a non-producer node on the EOS blockchain, how does the node receive new blocks as they are produced? Are they sent to it from a particular node? Can the software receive blocks from multiple nodes? And is this accomplished via TCP or UDP?

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When you start a nodeos process for the first time, a config file is generated automatically at .local/share/eosio/nodeos/config/config.ini by default.

In the config.ini file, peers can be specified by including one or many p2p-peer-address entries, e.g. p2p-peer-address = ctestnet.eosdetroit.com:1339

These peers can be any nodeos, including block producing and non-producing nodes, so long as the nodes have p2p-listen-endpoint and p2p-server-address set.

For example, the node that the above p2p-peer-address example is referencing would need to have the following entries in its config:

p2p-listen-endpoint = 0.0.0.0:1339

p2p-server-address = ctestnet.eosdetroit.com:1339

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    Dose it means this nodeos is restricted to receive blocks only from these p2p peers listed in config file?
    – chen
    Commented May 11, 2018 at 4:30

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