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luhiadmin
Comes here often
Member since Sep 7, 2017
02-05-2018
Community Record
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12-15-2017
10:52 AM
We tried most/all of the suggestions here - thanks - and someone's suggestion to reduce MTU size, but nothing had an effect. In an attempt to generate outgoing traffic, we found a way to easily browse to thousands of webs (Chrome extension + list of top 1M sites); it sort of worked but mostly we just locked up laptops. Comcast tier 2 tech could have been more helpful. Anyway, we bailed, cancelling this service; so we'll never know why...
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12-05-2017
08:45 AM
We throttled to 750/35 (and earlier 500/25), didn't help. Barring new clues from iperf, another continuous ping, etc. tests, we're giving up. Comcast is convinced it's not their problem, despite a failure when our net was disconnected. Only happens under load. Oh well. I'll summarize when we're done.
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12-05-2017
08:44 AM
We throttled to 750/35 (and earlier 500/25), didn't help. Barring new clues from iperf, another continuous ping, etc. tests, we're giving up. Comcast is convinced it's not their problem, despite a failure when our net was disconnected. Only happens under load. Oh well. I'll summarize when we're done.
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11-29-2017
03:07 PM
For posterity I'll document what we've done here the last 3 weeks: Comcast has tested Everything, short of replacing modem (new, no spares). We've tested Everything - swapped internal connections, lots of tests. The behavior: after ~20 minutes we see high packet loss / high latency, the router can go comatose for a few minutes, and even Comcast's modem can spontaneously reset. A 250 Mbps circuit has no problems. We disconnected the 250, no change. We're back to wondering if the router really can handle a gigabit circuit (at its 750 Mbps max). The 20 minute buildup to problems makes me (newbie) wonder. On the other hand, it seems someone's suggestion here to throttle the router at 500/25 would have circumvented a router issue. I'll call tech support again, we may get a replacement modem, we plan to do an iperf test at the modem, and may do a load test with pingplotter running at the modem.
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11-22-2017
11:42 AM
We thought it might be the fiber conversion boxes on "forced" instead of "auto", but that made it worse. Comcast thought it might be an incorrect duplex setting on their end, but that also made it worse. I'll swap misc. parts, they'll swap modem, and we're done - it either works or it doesn't and we bail.
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11-22-2017
11:41 AM
We thought it might be the fiber conversion boxes on "forced" instead of "auto", but that made it worse. Comcast thought it might be an incorrect duplex setting on their end, but that also made it worse. I'll swap misc. parts, they'll swap modem, and we're done - it either works or it doesn't and we bail
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11-22-2017
08:11 AM
Good advice. We reset the gigabit from 1000/40 to 500/25, but unfortunately no change in errors. Over Thanksgiving we will swap all parts (one at a time) and test under load. If Meraki or Comcast have no more ideas, we're going to cancel Comcast's gigabit coax service. We're the first to try it in this area; their own tier 2 has no experience with it, so it could be anything - the modem, who knows. Thanks.
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11-21-2017
09:40 AM
I realize an MX100 maxes at ~750 Mbps, but we have one on Comcast's new gigabit coax service (along with a 250 Mbps coax circuit, in fail-over) and it just isn't working. The 250 Mbps works, the gigabit has high (25%-100%) packet loss and high latency, it fails over for one minute several times a day, and occasionally throughput goes to zero without failing over. Comcast thinks their end is OK (one pingplotter and continuous ping test at modem didn't reveal anything); they do think we're maxing the gig's up speed, 35 Mbps, but the 250's up speed, 25 Mbps, doesn't cause issues). The only other factors I can think of: the 250 Mbps circuit is extended from demarc to server room with coax (modem by router), the gigabit by fiber (modem at demarc) we have high internal traffic from security cameras, but it is VLANed off we're having other recent problems like computers not consistently finding printers, AD server, or wifi APs all of this - router, gigabit circuit, VLANing, cameras - are new. We don't have the skills to properly debug this, so we're going to swap parts, circuits, etc. to isolate the issue.
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