NeoX nodes have difficulty discovering other nodes except bootnodes

[chenquanyu]

System information

Geth version: v0.2.2

Expected behaviour

NeoX geth node can find each other by setting same bootnodes.

Actual behaviour

NeoX geth node can only find bootnodes.

I have confirmed by adding logs that bootnodes return many nodes with other network IDs when responding to findnode requests. This is because in Geth's discovery protocol, the networkID is not checked during the node discovery phase, but when the connection is established. Please refer to ethereum/go-ethereum#15358.

[gsmachado]

why is discovery v5 bad? Is there any reason why we shouldn't be using/activating it?

[txhsl]

I think it is an issue rather than a bug, which only makes all the nodes under this protocol can discover each other.

[gsmachado]

This is still a thing. We need to address this asap.