[tor-bugs] #30253 [Core Tor/sbws]: Work out how to specify the country and AS for a CDN

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#30253: Work out how to specify the country and AS for a CDN
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 Reporter:  teor            |          Owner:  (none)
     Type:  enhancement     |         Status:  new
 Priority:  Medium          |      Milestone:  sbws: 1.2.x-final
Component:  Core Tor/sbws   |        Version:
 Severity:  Normal          |     Resolution:
 Keywords:  needs-proposal  |  Actual Points:
Parent ID:  #30229          |         Points:
 Reviewer:                  |        Sponsor:
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Comment (by teor):

 Copied from #30196:

 juga:
 > irl:
 > > * In some cases, the target is on a CDN, which means the AS may not be
 known in advance. In these cases we might choose to omit the AS number and
 instead use a user-assigned country code for the target.
 >
 > Do we currently have more than one CDN?. I only know one, though would
 be great to have more.

 We want to design sbws for the future Tor network. We currently use
 Fastly, we have talked about using CloudFlare and other CDNs.

 > > * We could assign QM-QZ (user-assigned codes not used elsewhere in Tor
 to my knowledge) to CDN providers but each new provider used would require
 a spec change, and external researchers would end up using whatever value
 and not being able to interop their data with ours if we clash.
 > > * We could use the OO escape code and build codes like "OOFastly"
 which is probably the more maintainable solution, but would require that
 parsers do not panic when they see >2 characters (I know the standard is
 known as alpha-2 but it isn't actually limited to 2 characters!)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30253#comment:2>
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