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#bittorrent #dht
| related-to | BEP5 - DHT Protocol |
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ping query is used to check if another node (one from its DHT routing table) is online and reachable.
ChatGPT clarifications
Question 1
In a DHT ping query, there is only one argument, the id of the “sender”. How the node knows where to send the ping to? Does it send it to all nodes in its routing table?
Answer
In a DHT ping query, the purpose is for one node to check if another node is still online and reachable. The ping query has only one argument, the id of the sender, which identifies the node that initiated the ping.
How the Ping Target is Chosen
The ping query is not sent to all nodes in the routing table. Instead, it is typically sent to:
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A Specific Node: The node chooses one specific target node from its routing table, usually one it hasn’t heard from recently or one that it wants to verify as active.
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Nodes to Maintain the Routing Table: Nodes also use pings to verify or refresh nodes in their routing table, ensuring that inactive nodes are removed and replaced by active ones.
When a Ping is Sent
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Maintaining the Routing Table: Periodically, nodes check entries in their routing table by pinging other nodes, especially if they haven’t been active recently. This ensures that stale entries are updated or removed.
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As Part of Lookup or Join Procedures: During node lookups or network joins, nodes may use pings to verify the status of other nodes before including them in the results or adding them to their own routing table.
In summary, a ping is directed to specific nodes rather than all nodes in the routing table. This selective pinging keeps the routing table accurate without creating unnecessary network traffic.