[ale] So, Comcast says 8-16ms to their first hop is... OK?

[neal at mnopltd.com]

Thanks for the reply.   So, since you have a UDM pro, somebody, before 
me, setup a Custom Verification rule:

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.

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.

regards,

Neal

On 2025-09-04 16:29, Raj Wurttemberg via Ale wrote:

> 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.
> 
> 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.
> 
> /Raj W.
> 
> From: Ale <ale-bounces at ale.org> on behalf of Neal Rhodes via Ale 
> <ale at ale.org>
> Reply-To: Atlanta Linux Enthusiasts <ale at ale.org>
> Date: Thursday, September 4, 2025 at 1:08 PM
> To: <ale at ale.org>
> Cc: <neal at mnopltd.com>
> Subject: [ale] So, Comcast says 8-16ms to their first hop is... OK?
> 
> 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.
> 
> 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.
> 
> Of that, 8-14ms is just the local Comcast router getting to its first 
> hop.
> 
> My AT&T Uverse is about 3ms to the first hop, and I understood that to 
> be normal.
> 
> I ping the Comcast Account manager, and here is the response:
> 
> _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.  _
> 
> _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. _
> 
> _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._
> 
> Really?  Comcast Business Internet is that bad?  And it's ok?
> 
> 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.
> 
> regards,
> 
> Neal
> 
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