Opened 8 months ago

Last modified 4 months ago

#28463 new defect

Measure exits as non-exits with 50% probability

Reported by: teor Owned by:
Priority: Medium Milestone: sbws: unspecified
Component: Core Tor/sbws Version:
Severity: Normal Keywords: scanner
Cc: pastly, juga Actual Points:
Parent ID: #29954 Points:
Reviewer: Sponsor:

Description

If an exit can't be measured as an exit for any reason, we still want to measure it.

If we choose to measure exits as non-exits with 50% probability, then non-working exits will still get measured.

This might be a bad thing: maybe we want exits that don't work as exits to have low bandwidths.

Child Tickets

Change History (10)

comment:1 Changed 8 months ago by teor

Do we want to do this fix in sbws 1.0?

comment:2 Changed 8 months ago by teor

Milestone: sbws 1.1
Version: sbws: 1.0.0

We will know if we need this fix after we monitor exit measurement failure rates.

comment:3 Changed 8 months ago by teor

Parent ID: #28458

Un-parenting, so we don't accidentally work on this ticket in sbws 1.0

comment:4 Changed 8 months ago by teor

Milestone: sbws 1.1sbws 1.2

Milestone renamed

comment:5 Changed 8 months ago by teor

Milestone: sbws 1.2sbws: 1.2.x

Milestone renamed

comment:6 Changed 8 months ago by teor

Milestone: sbws: 1.2.xsbws: 1.2.x-final

Milestone renamed

comment:7 Changed 8 months ago by teor

Milestone: sbws: 1.2.x-finalsbws: unspecified

Milestone renamed

comment:8 Changed 4 months ago by juga

A reason why an exit might always fail to be measured is when it retrieves the data from a CDN, the local resolver returns an IPv6 address, and the exit can exit to an IPv6 address (commented also in #16559).
Maybe the opposite could happen?.

comment:9 in reply to:  8 Changed 4 months ago by teor

Replying to juga:

A reason why an exit might always fail to be measured is when it retrieves the data from a CDN, the local resolver returns an IPv6 address, and the exit can exit to an IPv6 address (commented also in #16559).

Do you mean "the exit can't exit to an IPv6 address"?

Most IPv6 sites return an IPv4 and an IPv6 address in DNS.
But if the client asks for IPv6, the exit will try to use it.
But tor clients asks for IPv4 by default.

Does sbws set PreferIPv6 on its SOCKSPort?

Maybe the opposite could happen?.

I'm not sure what you mean by "the opposite".
Can you explain?

comment:10 Changed 4 months ago by juga

Keywords: scanner added
Parent ID: #29954
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