commit 7647f6d4de98acae6b71782648b0a646f11b146a Author: George Kadianakis desnacked@riseup.net Date: Sun Aug 31 16:27:35 2014 +0300

Specify how Guard Fraction voting should occur. --- proposals/236-single-guard-node.txt | 26 +++++++++++++++++++++----- 1 file changed, 21 insertions(+), 5 deletions(-)

diff --git a/proposals/236-single-guard-node.txt b/proposals/236-single-guard-node.txt index d7c03d3..32327db 100644 --- a/proposals/236-single-guard-node.txt +++ b/proposals/236-single-guard-node.txt @@ -110,12 +110,14 @@ Status: Open To do so, everytime an authority needs to vote for a guard, it reads a set of consensus documents spanning the past NNN months, where NNN is the number of months in the guard rotation period (10 - months if this proposal is adopted in full) and calculates the - visibility of the guard; that is, in how many consensuses it has - had the guard flag. + months if this proposal is adopted in full) and calculates in how + many consensuses it has had the guard flag for.

- The authorities include the age of each guard by appending - '[SP "GV=" INT]' in the guard's "w" line. + Then, in their votes, the authorities include the Guard Fraction of + each guard by appending '[SP "GuardFraction=" INT]' in the guard's + "w" line. Its value is an integer between 0 and 100, with 0 meaning + that it's a brand new guard, and 100 that it has been present in + all the inspected consensuses.

A guard N that has been visible for V out of NNN*30*24 consensuses has had the opportunity to be chosen as a guard by approximately @@ -142,6 +144,20 @@ Status: Open D' = D + F*B, if N has the exit flag E' = E + (1-F)*B, if N has the exit flag

+1.3.1. Guard Fraction voting + + To pass that information to clients, we introduce consensus method + 19, where if 3 or more authorities provided GuardFraction values in + their votes, the authorities produce a consensus containing a + GuardFraction keyword equal to the low-median of the GuardFraction + votes. + + The GuardFraction keyword is appended in the 'w' line of each router + in the consensus, after the optional 'Unmeasured' keyword. Example: + w Bandwidth=20 Unmeasured=1 GuardFraction=66 + or + w Bandwidth=53600 GuardFraction=99 + 1.4. Raise the bandwidth threshold for being a guard

From dir-spec.txt: