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<p>Thanks for the reply. So, since you have a UDM pro, somebody, before me, setup a Custom Verification rule: </p>
<p><img src="cid:994021048b50ded1f2444a11051994bf@mnopltd.com" /></p>
<p><img src="cid:b29997575d40c93a32788d0f6618f705@mnopltd.com" /><img src="cid:5aea208d30c2e398373320b83effc32b@mnopltd.com" /></p>
<p>This might have been the company that installed security cameras. Does this look remotely sane for Comcast? (75.75.75.75 is Comcast DNS) I have reverted the UDM to use the Auto SLA test to see what happens. </p>
<p>So, in general I'm hearing Comcast Business still uses a shared coax in many places, and yup, it might suck getting to that first hop. </p>
<p>regards, </p>
<p>Neal</p>
<p id="reply-intro">On 2025-09-04 16:29, Raj Wurttemberg via Ale wrote:</p>
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<p class="v1MsoNormal">We have the fault tolerant UDM Pro Max setup (main and "shadow") in our offices, and we have AT&T and Comcast. AT&T is the primary and is always rock-solid. I see the Comcast connection fail a few times during the week, so it is only used as a backup connection. I like it that the UDM Pro lets me know when there are internet issues.</p>
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<p class="v1MsoNormal">I too see about the same hop times as you do on AT&T and Comcast. Looking at my UniFi console now, I see that Comcast had six "high latency" alerts today.... None for AT&T.</p>
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<p class="v1MsoNormal">/Raj W.</p>
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<p class="v1MsoNormal"><strong><span style="font-family: 'Calibri',sans-serif; color: black;">From: </span></strong><span style="font-family: 'Calibri',sans-serif; color: black;">Ale <ale-bounces@ale.org> on behalf of Neal Rhodes via Ale <ale@ale.org><br /><strong>Reply-To: </strong>Atlanta Linux Enthusiasts <ale@ale.org><br /><strong>Date: </strong>Thursday, September 4, 2025 at 1:08 PM<br /><strong>To: </strong><ale@ale.org><br /><strong>Cc: </strong><neal@mnopltd.com><br /><strong>Subject: </strong>[ale] So, Comcast says 8-16ms to their first hop is... OK?</span></p>
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<p><span style="font-size: 10.0pt; font-family: 'Verdana',sans-serif;">We've been chasing why the church Unifi UDM Pro router is several times a day alerting that the Comcast Business Internet connection has gone down. </span></p>
<p><span style="font-size: 10.0pt; font-family: 'Verdana',sans-serif;">I did some pathping (kinda like MTR) tests yesterday, and typical times to 8.8.8.8 from the back of the Comcast router, eliminating our local router and lan are about 16ms. </span></p>
<p><span style="font-size: 10.0pt; font-family: 'Verdana',sans-serif;">Of that, 8-14ms is just the local Comcast router getting to its first hop. </span></p>
<p><span style="font-size: 10.0pt; font-family: 'Verdana',sans-serif;">My AT&T Uverse is about 3ms to the first hop, and I understood that to be normal. </span></p>
<p><span style="font-size: 10.0pt; font-family: 'Verdana',sans-serif;">I ping the Comcast Account manager, and here is the response:</span></p>
<p class="v1v1msonormal" style="background: white;"><em><span style="font-size: 10.0pt; font-family: 'Aptos',sans-serif; color: black;">Based on the findings, a lot of businesses/churches on the shared coax network in that area experience capacity issues which impacts reliability and performance. To solve this issue, I'd suggest a complete network overhaul, which we could setup and manage. </span></em><span style="font-size: 10.0pt;"></span></p>
<p class="v1v1msonormal" style="background: white;"><em><span style="font-size: 10.0pt; font-family: 'Aptos',sans-serif; color: black;">The first step would be migrating to a dedicated network. Comcast would build out a dedicated fiber connection to the church to guarantee network uptime and speed consistency. To guarantee wifi distribution/quality we would install a managed Meraki Device, with a new switch and Aps throughout the building. </span></em><span style="font-size: 10.0pt;"></span></p>
<p class="v1v1msonormal" style="background: white;"><em><span style="font-size: 10.0pt; font-family: 'Aptos',sans-serif; color: black;">Comcast would invest $11,789.43 to run the fiber line ( no cost to the church), and the monthly cost for everything would be estimated in the 2k-2.5k per month.</span></em><span style="font-size: 10.0pt;"></span></p>
<p class="v1v1msonormal" style="background: white;"><span style="font-size: 10.0pt; font-family: 'Verdana',sans-serif; color: black;">Really? Comcast Business Internet is that bad? And it's ok? </span><span style="font-size: 10.0pt;"></span></p>
<p class="v1v1msonormal" style="background: white;"><span style="font-size: 10.0pt; font-family: 'Verdana',sans-serif; color: black;">FYI, I have looked on what we could do to change the threshold in the Unifi router to relax the times and we can't find any such. </span><span style="font-size: 10.0pt;"></span></p>
<p class="v1v1msonormal" style="background: white;"><span style="font-size: 10.0pt; font-family: 'Verdana',sans-serif; color: black;">regards, </span><span style="font-size: 10.0pt;"></span></p>
<p class="v1v1msonormal" style="background: white;"><span style="font-size: 10.0pt; color: black;"> </span><span style="font-size: 10.0pt;"></span></p>
<p class="v1v1msonormal" style="background: white;"><span style="font-size: 10.0pt; font-family: 'Verdana',sans-serif; color: black;">Neal </span><span style="font-size: 10.0pt;"></span></p>
<p class="v1v1msonormal" style="background: white;"><span style="font-size: 10.0pt; color: black;"> </span><span style="font-size: 10.0pt;"></span></p>
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