[metrics-bugs] #27154 [Metrics/Relay Search]: lets use something else than AS0 for "unknown" AS number

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#27154: lets use something else than AS0 for "unknown" AS number
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 Reporter:  nusenu                |          Owner:  metrics-team
     Type:  enhancement           |         Status:  closed
 Priority:  Medium                |      Milestone:
Component:  Metrics/Relay Search  |        Version:
 Severity:  Normal                |     Resolution:  wontfix
 Keywords:                        |  Actual Points:
Parent ID:                        |         Points:
 Reviewer:                        |        Sponsor:
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Changes (by irl):

 * status:  new => closed
 * resolution:   => wontfix


Comment:

 English words are not numbers.

 The reason for choosing AS0 was that it will never appear in that field
 otherwise. The specification you have linked talks about AS0 being used
 for *non-routed* networks. If an IP address is non-routed then it would
 not appear in the routing tables that are used to generate this
 information.

 "unknown" means that we did not find the address in a lookup table, that
 is based on BGP routing tables.

 I considered using a private AS number for this field, but it is possible
 for these to be accepted by routers that aren't filtering properly, so
 this would lead to confusion.

 RFC7606 was part of the reasoning for choosing AS0.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/27154#comment:2>
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