[ale] Slightly OT: AT&T Fiber upload failures.

neal at mnopltd.com neal at mnopltd.com
Sun Jun 28 15:11:37 EDT 2026


We've been chasing AT&T on streaming upload failures on a Business Fiber 
setup for about 6 weeks now.

We've been streaming Sunday Morning services to Youtube for years on 
Comcast.

Switched to AT&T in March.   And........ increasingly were having 
Youtube abort the stream.

We were sending 60fps video, which amounted to about 6mbps; this is on a 
20mbps Fiber connection.

We dropped that to 30fps video, which is about 3.5mbps.

I ran the Speedtest CLI every 5 minutes from a script for several 24 
hour periods, and found Max Upload Latency all over the highway, from 
5ms to 528ms.   (BTW, we understand the upload SLA to be 37ms)

Granted, the Speedtest test tries to shove 20mbps upload; whereas we are 
trying to get consistent 3.5mbps.  this is to an AT&T Speedtest host in 
Atlanta.

I'm getting close to nowhere arguing with AT&T.    I recently took the 
church completely offline, disconnected our Unifi router, connected 
directly to the AT&T Calex box, ran the same tests, had roughly the same 
results.

AT&T level 2 support is asking ME to tell THEM where in the hops from us 
to THEM that THEY are bottlenecked.     Kinda hard, since MTR or 
TraceRoute gets 2 hops in, and then it's just stars with no data.  
'cause their equipment isn't replying to me.

Anyone have ideas, either on troubleshooting, or finding anyone within 
AT&T that actually knows anything about testing their own equipment?    
I was wondering about iPerf3, if they had a server for it.   It would be 
better to test a realistic 4mbps upload.

Anyone know the process to file a formal request for a failed SLA credit 
with AT&T?   The minimal docs I have apparently are no longer correct?

regards,

Neal
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