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Nebula Measurement Results Calendar Week 42

General Information

The measurements were conducted on the following machine:

  • vCPU - 4
  • RAM - 8GB
  • Disk - 160GB
  • Datacenter - nbg1-dc3
  • Country - Germany
  • City - Nuremberg

The following results show measurement data that was collected in calendar week 42 from 2021-10-18 to 2021-10-25 in 2021.

  • Number of crawls 338
  • Number of visits 2,917,838 (what is a visit?)
  • Number of unique peer IDs visited 3,968
  • Number of unique IP addresses found 2,787

Timestamps are in UTC if not mentioned otherwise.

Classification

Node classification:

  • offline - A peer that was never seen online during the measurement period (always offline) but found in the DHT
  • dangling - A peer that was seen going offline and online multiple times during the measurement period
  • oneoff - A peer that was seen coming online and then going offline only once during the measurement period
  • online - A peer that was not seen offline at all during the measurement period (always online)
  • left - A peer that was online at the beginning of the measurement period, did go offline and didn't come back online
  • entered - A peer that was offline at the beginning of the measurement period but appeared within and didn't go offline since then

Crawl Time Series

Churn

Inter Arrival Time

Agent Version Analysis

Overall

Includes all peers that the crawler was able to connect to at least once (dangling, online, oneoff, entered)

Classification

Geo location

Resolution Classification:

  • resolved - The number of peer IDs that could be resolved to at least one IP address (excludes peers that are only reachable via circuit-relays)
  • unresolved - The number of peer IDs that could not or just were not yet resolved to at least one IP address
  • no public ip - The number of peer IDs that were found in the DHT but didn't have a public IP address
  • relay - The number of peer IDs that were only reachable by circuit relays

Unique IP Addresses

Classification

Agents

Latencies

Overall

Connect measures the time it takes for the libp2p host.Connect call to return.

Connect plus Crawl includes the time of dialing, connecting and crawling the peer. Crawling means the time it takes for the FIND_NODE RPCs to resolve. Nebula is sending 15 of those with increasing common prefix lengths (CPLs) to the remote peer in parallel.

By Continent

Terminology

  • visit - Visiting a peer means dialing or connecting to it. Every time the crawler or monitoring task tries to dial or connect to a peer we consider this as visiting it. Regardless of errors that may occur.

Node classification:

  • offline - A peer that was never seen online during the measurement period (always offline) but found in the DHT
  • dangling - A peer that was seen going offline and online multiple times during the measurement period
  • oneoff - A peer that was seen coming online and then going offline only once during the measurement period multiple times
  • online - A peer that was not seen offline at all during the measurement period (always online)
  • left - A peer that was online at the beginning of the measurement period, did go offline and didn't come back online
  • entered - A peer that was offline at the beginning of the measurement period but appeared within and didn't go offline since then

IP Resolution Classification:

  • resolved - The number of peer IDs that could be resolved to at least one IP address (excludes peers that are only reachable by circuit-relays)
  • unresolved - The number of peer IDs that could not or just were not yet resolved to at least one IP address
  • no public ip - The number of peer IDs that were found in the DHT but didn't have a public IP address
  • relay - The number of peer IDs that were only reachable by circuit relays