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Sean to tech support: "My customer's Internet feed is down -- the T3 link (45Mbit/sec.) is showing a huge amount of CRC line errors on the router interface."
tech support: "Is the router powered on? Do you see illuminated LEDs?"
Sean to tech support: "Yes, the router is powered-on, and yes, I see illuminated LEDs. How else am I going to notice CRC errors on the Internet interface, if I need to login to the router to begin with to
see those CRC line errors?"
tech support:
<seemingly ignores the fact that they have a somewhat knowledgeable consultant on the phone, and proceeds to the next bullet item in their "script"> "Have you tried powering-off and powering-on the router?"
Sean to tech support: "Normally I'd be able to do that, but the problem is that this router serves other duties as well, and powering it off and on again will interrupt those other duties that, honestly, are working just fine. Besides, CRC line errors come from the *line* itself; they are normally not caused by the router -- especially if no changes were done to that router and it'd been working fine for months."
tech support: "Well, we don't see any problems on our end. Everything seems to be fine. We really need you to reboot that router."
<...this goes back and forth, and Sean hears a lot of typing in the background from the tech support...>
Suddenly, the CRC line errors disappear, and the Internet feed is working again!
Sean to tech support: "What did you just do? The CRC errors are now gone, and the Internet link is up again!"
tech support: "We did nothing. You must've done something on your end, because we're waiting on you to reboot your router."
Sean to tech support: "I told you -- I *can't* reboot this router nor do anything with it, because this router has other production duties besides Internet access, and I'm not allowed to disturb those duties. Did you do maintenance on the line last night, and it just needed a reset to clear things up?"
tech support: "We didn't do anything."
Sean to tech support: "Well, whatever it was you say you did or didn't do, please
don't do it again."

-Sean