2008-07-02 20:04:01 +02:00
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Filename: 145-newguard-flag.txt
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Title: Separate "suitable as a guard" from "suitable as a new guard"
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Version: $Revision$
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Last-Modified: $Date$
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Author: Nick Mathewson
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Created: 1-Jul-2008
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2008-07-02 21:17:51 +02:00
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Status: Open
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2008-07-14 22:44:44 +02:00
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Target: 0.2.1.x
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2008-07-02 20:04:01 +02:00
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2008-07-11 19:08:11 +02:00
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[This could be obsoleted by proposal 141, which could replace NewGuard
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with a Guard weight.]
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2008-07-02 20:04:01 +02:00
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Overview
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Right now, Tor has one flag that clients use both to tell which
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nodes should be kept as guards, and which nodes should be picked
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when choosing new guards. This proposal separates this flag into
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two.
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Motivation
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Balancing clients amoung guards is not done well by our current
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algorithm. When a new guard appears, it is chosen by clients
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looking for a new guard with the same probability as all existing
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guards... but new guards are likelier to be under capacity, whereas
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old guards are likelier to be under more use.
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Implementation
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We add a new flag, NewGuard. Clients will change so that when they
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are choosing new guards, they only consider nodes with the NewGuard
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flag set.
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For now, authorities will always set NewGuard if they are setting
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the Guard flag. Later, it will be easy to migrate authorities to
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set NewGuard for underused guards.
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Alternatives
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We might instead have authorities list weights with which nodes
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should be picked as guards.
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