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