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Re: CM500V and Synology RT2600ac: no internet
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CM500V and Synology RT2600ac: no internet
Comcast/xfinity is my ISP. In August I replaced the comcast combo modem/router with a Netgear CM500V modem and a Synology RT2600ac router, with another Synology MR2200ac router downstream to extend the range. This has worked great for the last 3ish months, then this week the internet connection started to get intermittant, then dropped completely.
When I connect a pc directly to the modem, the internet connection is great, with DL speeds around 300Mbps. But when I connect the router downstream, there is no internet connection. I tried both routers, and reset everything to factory defaults, with the same results: internet connection on the modem but it doesn't extend to the router. The router page indicates status of GOOD for both phone and router.
Is this a modem setting, or something on the router? Thanks for any advice. Event log pasted below:
Time | Priority | Description |
Time Not Established | Notice (6) | Honoring MDD; IP provisioning mode = IPv6 |
Time Not Established | Critical (3) | No Ranging Response received - T3 time-out;CM-MAC=cc:40:d0:ea:e7:00;CMTS-MAC=00:01:5c:76:42:6d;CM-QOS=1.0;CM-VER=3.0; |
Time Not Established | Critical (3) | SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=cc:40:d0:ea:e7:00;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0; |
Time Not Established | Notice (6) | Honoring MDD; IP provisioning mode = IPv6 |
Time Not Established | Critical (3) | No Ranging Response received - T3 time-out;CM-MAC=cc:40:d0:ea:e7:00;CMTS-MAC=00:01:5c:76:42:6d;CM-QOS=1.0;CM-VER=3.0; |
Time Not Established | Critical (3) | SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=cc:40:d0:ea:e7:00;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0; |
Fri Dec 06 11:18:14 2019 | Notice (6) | Honoring MDD; IP provisioning mode = IPv6 |
Fri Dec 06 11:18:05 2019 | Critical (3) | No Ranging Response received - T3 time-out;CM-MAC=cc:40:d0:ea:e7:00;CMTS-MAC=00:01:5c:76:42:6d;CM-QOS=1.0;CM-VER=3.0; |
Time Not Established | Notice (6) | Honoring MDD; IP provisioning mode = IPv6 |
Time Not Established | Critical (3) | No Ranging Response received - T3 time-out;CM-MAC=cc:40:d0:ea:e7:00;CMTS-MAC=00:01:5c:76:42:6d;CM-QOS=1.0;CM-VER=3.0; |
Time Not Established | Critical (3) | SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=cc:40:d0:ea:e7:00;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0; |
Time Not Established | Critical (3) | SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=cc:40:d0:ea:e7:00;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0; |
Time Not Established | Critical (3) | SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=cc:40:d0:ea:e7:00;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0; |
Time Not Established | Critical (3) | SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=cc:40:d0:ea:e7:00;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0; |
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Re: CM500V and Synology RT2600ac: no internet
do you have a screen snip of your modem connections page as well?
So it works fine if you have a pc connected to the modem but if you connect the router tot he modem, it doesn't work?
Usually we tell people if a direct connection works great, then you move on to the next device in line that could be causing issues.
Have you tried replacing cables?
Are you booting up in the proper sequence?
shut both devices off, boot up modem and give it a couple minutes, then booting up the router?
In terms of checking your router, you'd probably want to ask on the Synology forum as that'd be their device.
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Re: CM500V and Synology RT2600ac: no internet
Agreed that it would make sense that it is the router that is causing the issue, but I've tried two routers, both of which worked fine previously. I understand that Xfinity controls the settings on the modem, but I don't have a history of those settings to see if anything has changed.
I have posted this question on the Synology and Xfinity forums as well, no answers yet.
I have changed cables to make sure it isn't the cables. I have rebooted with the sequence you describe several times. Unless I figure this out, I'll probably go get a modem from Comcast this morning to see if/how that changes anything.
Settings are shown below, starting frequency is 0.
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Re: CM500V and Synology RT2600ac: no internet
t3 timeouts are fairly common. Not a big deal unless its happening quite requently.
A couple things you can try.
1. remove any splitters, amplifiers, attenuators from your line.
2. prefereably just connect the modem directly where the coax lines enters the house. this prevents the wiring within your house from causing the issues.
3. Check your connections to make sure they're not loose/corroded.
4. Check the cables for kinks. Replace them if there are.
These are some basic things you can do with your modem. Your signal looks great but its only a snap shot in time of when you opened the connections page. It also works when you plug your pc/laptop in. It makes me think its not the modem. But when it happens with more than 1 router.....anything is possible.
Any chance you have a non-synology router you could try?
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Re: CM500V and Synology RT2600ac: no internet
I've replaced the cables multiple times just to rule it out. I can't have the modem right at the cable entrance, and because I'm consistently getting such a strong internet signal direct from the modem, I don't think it's a connection or signal issue.
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Re: CM500V and Synology RT2600ac: no internet
Note that I contacted Synology tech support as well, and they agreed with the conclusion: there is some issue with the Netgear router. I've just slightly exceeded the 90 day warranty; will Netgear stand by this prodcut and issue a replacement? @netgear
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Re: CM500V and Synology RT2600ac: no internet
Click mynetgear at the top. Register an account and then your device. From there you can contact support
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