[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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Comment (by irl):

 Replying to [comment:3 nusenu]:
 > Replying to [comment:2 irl]:
 > > English words are not numbers.
 >
 > I guess no one claimed that.

 Except that AS numbers are numbers and the code is currently written in a
 way that expects 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.
 >
 > correct and that is the reason why it is confusing to use AS0 for
 actually routed IP addresses

 But according to our lookup table, they are not. In the same way it is
 also possible for the AS announcing a prefix to change between updates of
 the lookup table and we would report the wrong AS number then too. The
 lookup is performing its job and reporting that the prefix was not
 announced when it returns AS0.

 > > RFC7606 was part of the reasoning for choosing AS0.
 >
 > RFC7606 - "Revised Error Handling for BGP UPDATE Messages"
 > not sure how this is related, I did not find "AS0" or "AS 0" in that
 document

 I meant 7607.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/27154#comment:4>
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