[tor-bugs] #19420 [Metrics/Onionoo]: No AS data for some relays

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#19420: No AS data for some relays
-----------------------------+--------------------------
 Reporter:  twim             |          Owner:  karsten
     Type:  defect           |         Status:  accepted
 Priority:  Medium           |      Milestone:
Component:  Metrics/Onionoo  |        Version:
 Severity:  Normal           |     Resolution:
 Keywords:  as, asn, geoip   |  Actual Points:
Parent ID:                   |         Points:
 Reviewer:                   |        Sponsor:
-----------------------------+--------------------------
Changes (by karsten):

 * owner:   => karsten
 * status:  new => accepted


Comment:

 Right, I noticed the same issue today while migrating Compass to a new
 host.

 Turns out MaxMind's latest ASN database contains many entries with AS
 number but without AS name.  Two sample lines:

 {{{
 16844800,16845055,"AS4134 Chinanet"      # AS number and name
 16846848,16847871,AS49597                # AS number only
 }}}

 In absolute numbers and compared to the January and February 2016
 databases (I don't have databases from March to May anymore):

 ||'''Database''' || '''AS number and name'''|| '''AS number only'''||
 ||January 4, 2016  ||                  235,323||                  514||
 ||February 1, 2016 ||                  236,474||                  544||
 ||June 6, 2016     ||                  187,415||               57,773||
 ||June 13, 2016    ||                  188,139||               57,179||

 The June 6 database is currently deployed and the June 13 database is the
 latest I could download from MaxMind.  It looks like they broke something,
 and it seems unlikely that they'll fix that in the next database unless
 somebody tells them.  Would you want to reach out to them and see if they
 can fix this?

 I guess the short-term fix is that we include AS numbers in Onionoo
 results even if they come without AS names.  We currently don't do that.

 Another quick fix would be to downgrade to the February 1 database.  Would
 that be better?

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19420#comment:1>
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