mirror of
https://gitlab.torproject.org/tpo/core/tor.git
synced 2024-12-01 08:03:31 +01:00
d230827912
Tor doesn't use SVN anymore, making $Revision$, $Id$ and $Date$ meaningless. Remove them without replacement.
50 lines
2.0 KiB
Plaintext
50 lines
2.0 KiB
Plaintext
Filename: 138-remove-down-routers-from-consensus.txt
|
|
Title: Remove routers that are not Running from consensus documents
|
|
Author: Peter Palfrader
|
|
Created: 11-Jun-2008
|
|
Status: Closed
|
|
Implemented-In: 0.2.1.2-alpha
|
|
|
|
1. Overview.
|
|
|
|
Tor directory authorities hourly vote and agree on a consensus document
|
|
which lists all the routers on the network together with some of their
|
|
basic properties, like if a router is an exit node, whether it is
|
|
stable or whether it is a version 2 directory mirror.
|
|
|
|
One of the properties given with each router is the 'Running' flag.
|
|
Clients do not use routers that are not listed as running.
|
|
|
|
This proposal suggests that routers without the Running flag are not
|
|
listed at all.
|
|
|
|
2. Current status
|
|
|
|
At a typical bootstrap a client downloads a 140KB consensus, about
|
|
10KB of certificates to verify that consensus, and about 1.6MB of
|
|
server descriptors, about 1/4 of which it requires before it will
|
|
start building circuits.
|
|
|
|
Another proposal deals with how to get that huge 1.6MB fraction to
|
|
effectively zero (by downloading only individual descriptors, on
|
|
demand). Should that get successfully implemented that will leave the
|
|
140KB compressed consensus as a large fraction of what a client needs
|
|
to get in order to work.
|
|
|
|
About one third of the routers listed in a consensus are not running
|
|
and will therefore never be used by clients who use this consensus.
|
|
Not listing those routers will save about 30% to 40% in size.
|
|
|
|
3. Proposed change
|
|
|
|
Authority directory servers produce vote documents that include all
|
|
the servers they know about, running or not, like they currently
|
|
do. In addition these vote documents also state that the authority
|
|
supports a new consensus forming method (method number 4).
|
|
|
|
If more than two thirds of votes that an authority has received claim
|
|
they support method 4 then this new method will be used: The
|
|
consensus document is formed like before but a new last step removes
|
|
all routers from the listing that are not marked as Running.
|
|
|