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Forum Discussion
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 t...
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.
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.
Startup Procedure
Procedure
Status
Comment
Acquire Downstream Channel
621000000 Hz
Locked
Connectivity State
OK
Operational
Boot State
OK
Operational
Security
Enabled
BPI+
IP Provisioning Mode
Honor MDD
honorMdd(4)
Downstream Bonded Channels
Channel
Lock Status
Modulation
Channel ID
Frequency
Power
SNR
Correctables
Uncorrectables
1
Locked
QAM256
29
621000000 Hz
2.2 dBmV
39.2 dB
0
0
2
Locked
QAM256
8
489000000 Hz
1.1 dBmV
39.5 dB
0
0
3
Locked
QAM256
10
507000000 Hz
1 dBmV
37.7 dB
0
0
4
Locked
QAM256
11
513000000 Hz
0.6 dBmV
39 dB
0
0
5
Locked
QAM256
12
519000000 Hz
1.3 dBmV
39.4 dB
0
0
6
Locked
QAM256
13
525000000 Hz
0.9 dBmV
39.2 dB
0
0
7
Locked
QAM256
14
531000000 Hz
0.9 dBmV
39 dB
0
0
8
Locked
QAM256
15
537000000 Hz
0.7 dBmV
38.9 dB
0
0
9
Locked
QAM256
16
543000000 Hz
1 dBmV
39 dB
0
0
10
Locked
QAM256
17
549000000 Hz
1.4 dBmV
39.2 dB
0
0
11
Locked
QAM256
18
555000000 Hz
1.6 dBmV
39.2 dB
0
0
12
Locked
QAM256
19
561000000 Hz
2.1 dBmV
39.5 dB
0
0
13
Locked
QAM256
20
567000000 Hz
2.1 dBmV
39.3 dB
0
0
14
Locked
QAM256
22
579000000 Hz
2.7 dBmV
39.8 dB
0
0
15
Locked
QAM256
26
603000000 Hz
2.5 dBmV
39.6 dB
0
0
16
Locked
QAM256
27
609000000 Hz
3.1 dBmV
39.6 dB
0
0
Upstream Bonded Channels
Channel
Lock Status
US Channel Type
Channel ID
Symbol Rate
Frequency
Power
1
Locked
ATDMA
1
5120 Ksym/sec
17300000 Hz
40.8 dBmV
2
Locked
ATDMA
2
5120 Ksym/sec
23700000 Hz
40.5 dBmV
3
Locked
ATDMA
3
5120 Ksym/sec
30300000 Hz
40.5 dBmV
4
Locked
ATDMA
4
5120 Ksym/sec
36700000 Hz
41 dBmV
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?
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.
An update: I got a modem/router from Xfinity this morning. Both wired and wifi connections work fine. I changed the configuration on the Synology router so it is a WAP only, and it works fine, again solid internet connection via both wifi or ethernet (and wifi from Synology as WAP is set as unique, to clarify that network connection is coming from that router).I then set the Xfinity modem/router up in bridge mode, so it acts more like a modem only. I put the Synology router back into router mode, and the internet connection is fine via ethernet/wifi connections through the Synology.This sounds to me like the problem is with the Netgear modem, but I still don't understand what the problem is. I can live with this setup (keeping and using the Xfinity hardware), but not my first choice.