I originally titled this "how to tell if your internet is down or your network is just screwed up" and Jeff's AI said that this questioned would probably be closed.
Nevertheless, someone here is always on the phone with the ISP and it's usually our fault. What are some of the best techniques for telling whether you've got an issue or they've got an issue.
I know this might be too much of a blanket question, but in a case where there's intermittent latency and disconnects (not just overall outages [i.e. can't ping google.com]) what do you do before calling the ISP?
Answer
A handy test site is: http://downforeveryoneorjustme.com/
Pings and traceroutes are some of the first and best tests when beginning this sort of investigation. Firewalls may block this traffic however.
Don't just stop at normal pings. Try ping to send some big packets and make sure it's not a fragmentation/MTU issue.
Check your utilization -- your tubes may be full.
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