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An Ethereum node requires both TCP (listener) and UDP (discovery) port (usually 30303) open and reachable by other nodes.

My question: is it possible to run a private network with my node only reachable by the peers via TCP port 30303, if those peers configure my node as a bootnode?

geth --bootnodes "enode://myID@myIP:30303"

Or will the peers drop my bootnode if only it's TCP but not the UDP port 30303 is reachable?

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