know what's on your network (2)

not to imply that measuring the Internet in general works
can't measure topology effectively in either direction. at any layer.
can't track propagation of a bgp update across the Internet
so how to build this theory we're so lame for not having -- discouraging to academics
can't get router to give you its whole RIB, just FIB (best routes)
can't get precise one-way delay from two places on the Internet 
can't get an hour of packets from the core
can't get accurate flow counts from the core
can't get anything from the core with real addresses in it
can't get topology of core
can't get accurate bandwidth or capacity info
not even along a path much less per link
SNMP just an albatross (enough to inspire telco envy)
no 'why' tool: what's causing problem now?
privacy/legal issues disincent research
result --> meager shadow of careening ecosystem
    if you're not scared i'm not explaining this right