[tor-bugs] #21995 [Metrics/Torflow]: Set PreferIPv6 on Bandwidth Scanner SOCKSPorts

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#21995: Set PreferIPv6 on Bandwidth Scanner SOCKSPorts
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 Reporter:  teor             |          Owner:  aagbsn
     Type:  enhancement      |         Status:  new
 Priority:  Medium           |      Milestone:
Component:  Metrics/Torflow  |        Version:
 Severity:  Normal           |     Resolution:
 Keywords:                   |  Actual Points:
Parent ID:                   |         Points:
 Reviewer:                   |        Sponsor:
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Comment (by teor):

 We want to check both the IPv4 and IPv6 bandwidth.

 So if we are using DNS, we should set PreferIPv6, and then put two
 different addresses in the scanner:
 * an IPv4-only address (either DNS or an IPv4 anycast literal),
 * a dual-stack DNS.

 That way, IPv4-only exits get measured 100% via IPv4, and dual-stack exits
 get measured 50% via IPv4 and 50% via IPv6.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21995#comment:2>
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