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<p>The Comcast Router was restarted last night around 7pm. Maybe a bit too early to tell for sure, but the office and pre-school activity has been running since 8am and it looks a bit less dodgy. </p>
<p>Still no response from Ubiquiti on their criteria. </p>
<p><img src="cid:ca3a260d40b755500cb5f70b86d60a27@mnopltd.com" /></p>
<p id="reply-intro">On 2024-11-14 11:25, Derek Atkins wrote:</p>
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<div class="pre" style="margin: 0; padding: 0; font-family: monospace">What concerns me is the "empty" part of your graph.. At the 45ms peak,<br />there appears to be a section of "no response". Note that depending on<br />the service being used, it's possible that the service is down.<br /><br />FWIW, I run mrtg to monitor my network -- I run pings to several different<br />places to test latency across my uplink. Specifically, one place I ping<br />is my 1st-hop upstream router. If that router goes down or doesn't<br />respond, it is 100% correlated to my connection being down for everything.<br /><br />Of course, YMMV.<br /><br />-derek<br /><br />On Thu, November 14, 2024 11:08 am, Neal Rhodes via Ale wrote:
<blockquote type="cite" style="padding: 0 0.4em; border-left: #1010ff 2px solid; margin: 0">Thanks for the reply.<br /><br />I just got off the phone with Comcast. To my delight it only took 12<br />minutes total.<br /><br />Their criteria is, they don't get concerned until:<br /><br /> * Packets get lost;<br /> * Latency exceeds 100ms.<br /><br />To which I can only say, wow.<br /><br />Comcast tech also says I should reboot their router. (uptime over 140<br />days.)<br /><br />My bet is the Ubiquiti router has much tighter assumptions. Next I<br />need to ask them precisely what their criteria is for concluding<br />disconnection.<br /><br />regards,<br /><br />Neal<br /><br />On 2024-11-14 10:56, Derek Atkins wrote:<br /><br />
<blockquote type="cite" style="padding: 0 0.4em; border-left: #1010ff 2px solid; margin: 0">Hi Neal,<br /><br />I ditto what James says (and was going to say the same thing). Take a<br />laptop that you KNOW can handle 1Gb, to be sure it's not a laptop<br />limitation, and then plug into the router to be sure you can show the<br />issue from their CPE. Showing it from the Ubiquiti equipment is not<br />sufficient.<br /><br />Also, it helps if you can have a tech on the phone while the problem is<br />occurring. I used to have Comcast Biz and would lose network every<br />time<br />there was a neighborhood power outage. It took a 3hr outage during the<br />day and me calling just as the outage stopped for them to find the node<br />with the bad battery.<br /><br />So back to your issue. It looks like it could be a network drop, a<br />DHCP<br />renew that takes too long, or possibly even an upstream issue with<br />Comcast.<br /><br />Expect to spend time trying to reproduce it, especially if it's<br />something<br />that isn't reliably reproducible. You might also want to look at<br />potential buffer bloat, and also explore the possibility of NAT Table<br />overload.<br /><br />Having said that, the RTT you see (17ms) is reasonable for a cablemodem<br />plant.<br /><br />-derek<br /><br />On Thu, November 14, 2024 10:41 am, James Taylor via Ale wrote: My<br />experience with Comcast Business says that the you need to spend time<br />in the furnace room.<br />They are going to test from their router and if you don't show the<br />problem<br />there, they are unlikely (i.e. - never) to look further.<br />-jt<br /><br />James Taylor<br />678-697-9420<br /><a href="mailto:james.taylor@eastcobbgroup.com">james.taylor@eastcobbgroup.com</a><br /><br />Neal Rhodes via Ale <<a href="mailto:ale@ale.org">ale@ale.org</a>> 11/14/2024, 10:36 AM >>></blockquote>
This feels like a classic three party finger pointing exercise, and I'm<br />doing a bit of research before we jump in.<br /><br />A couple of years ago, our church put in a sophisticated (at least by MY<br />Measure) Ubiquity Unifi Mesh network, mostly to support security camera<br />for the community pre-school.<br /><br />The core is a UDM Pro router, feeding all Ubiquiti stuff.<br /><br />And it has run totally steady.<br /><br />Here's the rub: Now that the "Last Guy That Touched it" moved to<br />Florida, I'm getting multiple alerts per day to the effect of:<br /><br />* Your primary internet Comcast Business was disconnected and has been<br />restored multiple times in last 24h. If this persists, please try<br />restarting your ISP Modem.<br />* Primary internet is experiencing high latency. Please restart the<br />modem or contact the ISP if this persists.<br /><br />Aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaand, nobody complains. Occasionally,<br />I will see Zoom meetings from home where the church participants go<br />really fuzzy and blocky, like Zoom has downshifted their resolution.<br /><br />Apparently it measures ping time to Ping.UI.Com to decide this.<br /><br />The Unifi Console reports the Comcast Business router as providing<br />typical 14ms latency. With the occasional spike to 45ms.<br /><br />When I ping that address from my Uverse internet from home, I'm seeing<br />consistently results from 7ms to 10ms.<br /><br />I don't know whether to ask Ubiquiti about raising their thresholds, or<br />Nag Comcast about their performance. I guess I could ask Ubiquiti<br />precisely what does "Internet Disconnected" mean?<br /><br />My personal experience with Business Comcast in the past has been.......<br />not impressive. Usually, a service call just makes it worse. Is<br />Comcast going to take my report from Ubiquiti seriously? Or tell me to<br />pound sand? What additional evidence need I present?<br /><br />Yes, I could spend a quality hour in the furnace room, with a notebook<br />connected to the LAN side of the Comcast router, (the only way I can<br />talk to it) and see what I can see.<br /><br />I suppose I could just call Comcast, and give up another hour of my life<br />to try and talk to someone with a clue.<br /><br />regards,<br /><br />Neal<br />_______________________________________________<br />Ale mailing list<br /><a href="mailto:Ale@ale.org">Ale@ale.org</a><br /><a href="https://mail.ale.org/mailman/listinfo/ale" target="_blank" rel="noopener noreferrer">https://mail.ale.org/mailman/listinfo/ale</a><br />See JOBS, ANNOUNCE and SCHOOLS lists at<br /><a href="http://mail.ale.org/mailman/listinfo_______________________________________________" target="_blank" rel="noopener noreferrer">http://mail.ale.org/mailman/listinfo_______________________________________________</a><br />Ale mailing list<br /><a href="mailto:Ale@ale.org">Ale@ale.org</a><br /><a href="https://mail.ale.org/mailman/listinfo/ale" target="_blank" rel="noopener noreferrer">https://mail.ale.org/mailman/listinfo/ale</a><br />See JOBS, ANNOUNCE and SCHOOLS lists at<br /><a href="http://mail.ale.org/mailman/listinfo" target="_blank" rel="noopener noreferrer">http://mail.ale.org/mailman/listinfo</a><br /><br /></blockquote>
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