<html><body><div><div><span>I just got off the phone with a Comcast tech, and wanted to double-check my sanity.</span></div><br><div><span>Somehow in the last 6 months I've managed to reach the exact same rep twice when dealing with an outage or a degraded service event.</span></div><br><div><span>I asked him to remotely reboot the modem because there was high packet loss.</span></div><br><div><span>Both times I've talked with him, he noted the high packet loss, started to reboot the modem, and then asked me point-blank if we had any PoE switches on our network.</span></div><br><div><span>When I said "yes", he said I needed to disable PoE because it messes with the Comcast modems and he can see "buildups" in his graphs that show power is "leaking" to the Comcast modem every 24 hours.</span></div><br><div><span>For reference, our setup is:</span></div><br><div><span>Internal Network ←→ PoE Switch ←→ My Router (FreeBSD Box) ←→ Comcast Modem</span></div><br><div><span>I told him the Comcast modem isn't plugged into the PoE Switch, it's plugged into My Router (FreeBSD box) and My Router does not negotiate PoE+ and the switch shows PoE isn't being send to My Router's LAN port. While the switch is capable of outputting old-school 24v PoE, it must be specifically turned on for a port, and it's not enabled or used anywhere on the networks I manage.</span></div><br><div><span>When provided with that information, the Comcast tech still insisted that the switch was sending PoE to My Router and it was "leaking through" to the Comcast modem and that's why every 4-6 weeks the Comcast modem needs to be reset. The tech insisted that switches that </span><i><span>are</span></i><span> PoE-capable </span><i><span>always</span></i><span> send PoE even if the device doesn't request it or negotiate it. Attempts to explain the difference between the old 24-volt PoE and PoE+/++ were met with arguing that he's been in the industry for decades and I don't know what I'm talking about...and that all my problems would go away if I just disabled PoE everywhere on the switch.</span></div><br><div><span>Again, I double-checked the port and said "It's not sending PoE to my router, but even if I were, I highly doubt PoE would leak through a PCI card to the opposite side of the chassis to the on-board NIC and out to your modem".</span></div><br><div><span>He insisted it happened "all the time" and he had previously fried equipment by plugging it into a PoE switch. He insisted that he's also handled quite a few calls relating to this magic PoE problem over the years and Comcast has internal tools that show graphs of how much PoE power "builds up" inside their modems and he "can see a buildup in my router that resets every 24 hours".</span></div><br><div><span>I didn't have the heart to tell him that I manage about 40 networks that have Comcast connections...and they </span><i><span>all</span></i><span> have identical FreeBSD boxes acting as their router, and they are </span><i><span>all</span></i><span> using the exact same PoE switches at every location with all ports set to PoE+...and we only have degraded service or outages after ~30 days at ~3 locations.</span></div><br><div><span>Slightly off-topic, but if I call Comcast about outages or degraded service and any </span><i><span>other</span></i><span> tech but this guy answers, they all say "you need to unplug your Comcast modem and plug it back in once every 3-4 weeks" and they act like it's normal to reboot the modems every few weeks. In fact, last week I wanted Comcast to check on a modem setting at one location and they said the modem had been up for over 127 days and it should be rebooted. I said "it's up and working fine, why would I reboot it?".</span></div><br><div><span>Anyways, am I insane for thinking the tech was flat-out wrong? I mean...occasionally some really bizarre stuff happens in IT...but this seems extremely far-fetched and contrary to everything I know about the PoE standard.</span></div><br><div><span>-A</span></div></div></body></html>