challenges in Internet analysis (3)

don't forget the real world
analyses must incorporate expense ratios (opex/capex) into tradeoffs where possible
need to get/keep relevant to providers

systematic studies of outages
assessment of various causes of damage

tools and techniques to tie user-perceived performance w/ network measurement, with statistically significant results 
function of control plane, routing plane, server on other end.
including bugs in routers, servers, client stacks
correlating user experience with events that happen in the network
incorporate into network performance models
validation of tools still doesn't exist
use at truly large scale still doesn't exist
dave clark's `why?' tool (non network geek compatible) still doesn't exist