[tor-relays] entry guard interference?

[starlight.2015q1 at binnacle.cx]

I should add that three ping-plotters
pointed at various diverse networks
ran clean during the outage, and that
trusty Google was accessible at all
times via normal HTTP.  So the local
carrier appears to have had no
disruptions.

I didn't think to ping the guards
or other proximate systems at the time,
but certainly will do so if this happens
again.  Will run

   traceroute -A

as well.