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Re: [tor-bugs] #23278 [Core Tor/Tor]: Give user option to use non-Exit Guards only
#23278: Give user option to use non-Exit Guards only
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Reporter: cypherpunks | Owner: (none)
Type: enhancement | Status: new
Priority: Medium | Milestone:
Component: Core Tor/Tor | Version:
Severity: Normal | Resolution:
Keywords: | Actual Points:
Parent ID: | Points:
Reviewer: | Sponsor:
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Comment (by cypherpunks):
> Specifically, right now Exit capacity is scarce in the network, so every
relay that has both the Guard flag and the Exit flag is always avoided
when clients are picking a guard, since they know to leave its bandwidth
available for people who are using it as an exit.
More specifically, it depends bandwidth-weights generated by DirAuths for
consensus document. bandwidth-weights are dynamic depends network's
weather.
Simplified code to compute Guard bandwidth by client for Exit+Guard case:
{{{
Wd = networkstatus_get_bw_weight(NULL, "Wgd", -1);
Wdb = networkstatus_get_bw_weight(NULL, "Wdb", -1);
//Today: Wdb=10000 Wgd=0
weight = (is_dir ? Wdb*Wd : Wd); // 0 or 0 for today
final_weight = weight*this_bw; // 0 for WEIGHT_FOR_GUARD
bandwidths[node_sl_idx] = final_weight + 0.5;
}}}
0.5 is not zero after all. It is today, not yesterday or tomorrow.
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23278#comment:6>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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