Comments (4)
Node that has reached its max. connections is treated as unreachable as the response the crawler may get from the node usually has no distinction from e.g. firewall rule blocking the incoming connection.
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For the validation done in https://getaddr.bitnodes.io/#join-the-network, it makes sense to report maxed out node as unreachable. In terms of estimating the size of the network, the crawler takes a snapshot of the network about every 5 minutes. If your node is not already connected to the crawler and is currently maxed out, it will be considered as unreachable. If your node is already connected to the crawler and maxed out in the next snapshot, it will still be counted into the estimated number of reachable nodes.
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@ayeowch it's not possible to be permanently connected to the crawler, right? The crawler connects and disconnects immediately after.
Also, this is the log that I get when bitnodes connects and I'm maxed out, shouldn't it be able to detect that the node is still alive?
13:51:56 2017-05-30 [INF] BMGR: New valid peer 136.243.139.96:47319 (inbound) (/bitnodes.21.co:0.1/)
13:51:56 2017-05-30 [INF] SRVR: Max peers reached [125] - disconnecting peer 136.243.139.96:47319 (inbound)
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@stevenroose crawl.py (source address 136.243.139.96) is used to exhaustively (DFS) look for all currently reachable nodes starting from a list of seed nodes. Each of these nodes is sent to ping.py (source address 136.243.139.120) for it to connect to if it haven't already and maintain the connection to gather network and tx/block inv latency data with periodic ping within the established connection.
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