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138-remove-down-routers-from-consensus.txt

138-remove-down-routers-from-consensus.txt 2.0 KB
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  1. Filename: 138-remove-down-routers-from-consensus.txt
    2. 

  2. Title: Remove routers that are not Running from consensus documents
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  3. Author: Peter Palfrader
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  4. Created: 11-Jun-2008
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  5. Status: Closed
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  6. Implemented-In: 0.2.1.2-alpha
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  7. 

  8. 1. Overview.
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  9. 

  10.   Tor directory authorities hourly vote and agree on a consensus document
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  11.   which lists all the routers on the network together with some of their
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  12.   basic properties, like if a router is an exit node, whether it is
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  13.   stable or whether it is a version 2 directory mirror.
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  14. 

  15.   One of the properties given with each router is the 'Running' flag.
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  16.   Clients do not use routers that are not listed as running.
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  17. 

  18.   This proposal suggests that routers without the Running flag are not
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  19.   listed at all.
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  20. 

  21. 2. Current status
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  22. 

  23.   At a typical bootstrap a client downloads a 140KB consensus, about
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  24.   10KB of certificates to verify that consensus, and about 1.6MB of
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  25.   server descriptors, about 1/4 of which it requires before it will
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  26.   start building circuits.
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  27. 

  28.   Another proposal deals with how to get that huge 1.6MB fraction to
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  29.   effectively zero (by downloading only individual descriptors, on
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  30.   demand).  Should that get successfully implemented that will leave the
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  31.   140KB compressed consensus as a large fraction of what a client needs
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  32.   to get in order to work.
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  33. 

  34.   About one third of the routers listed in a consensus are not running
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  35.   and will therefore never be used by clients who use this consensus.
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  36.   Not listing those routers will save about 30% to 40% in size.
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  37. 

  38. 3. Proposed change
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  39. 

  40.   Authority directory servers produce vote documents that include all
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  41.   the servers they know about, running or not, like they currently
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  42.   do.  In addition these vote documents also state that the authority
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  43.   supports a new consensus forming method (method number 4).
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  44. 

  45.   If more than two thirds of votes that an authority has received claim
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  46.   they support method 4 then this new method will be used:  The
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  47.   consensus document is formed like before but a new last step removes
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  48.   all routers from the listing that are not marked as Running.
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  49.