asn_lookup update script FTP vs HTTP

[ghost]

The current asn_lookup / pyasn update script uses FTP to fetch the database from archive.routeviews.org, but we only used http(s)_proxy yet. So this won't work in some environments (including @certat's). So fixing hadiasghari/pyasn#62 would still be nice, or alternatively hadiasghari/pyasn#64

[gethvi]

Given the pyasn package is not currently maintained, a completely different option is to use GeoLite2 ASN and have maxmind_asn expert bot. However I can not say which one of the data sources is better in terms of quality.

Pros:

• reliable source and maintained geoip package
• one less dependency (because geoip package is already being used by other bot)

Cons:

• new bot needs to be implemented (but we already have almost the same code)

[ghost]

Are you sure that the GeoLite2 database has a good enough ASN-IP address mapping?

With pyasn you can use any BGP routing table which makes you very independent from (one) external data source(s).

[ghost]

fixed by #1524