***** Begin Event Log Paste *****Time Priority Description2019-03-08, 09:22:51 Notice (6) CM-STATUS message sent. Thought 1:  Perhaps Comcast only issues addresses to its gateways via DHCPv6 and since the firewall only supports SLAAC/RA, that's the issue? I would contact the ISP and have them check the signal line up to the modem and have them watch you as your speed testing. So, the only thing that has changed is the modem. I have the exact same issue on xfinity as well. In Stock. Update 2:  Let's mark this as "solved," since the CM1100 is indeed pulling an IPv6 address. I'm ok with the other user posting if there issue was similar. The CM1100 is plugged into our firewall (Untangle v14.1.1) with IPv6 config set to Auto (SLAAC/RA). Everyone's situation is different. ***** Begin Event Log Paste ***** I have had service since 3/31/2020 and never once have I received more than 400-500mbs a second, and I experience random internet dropouts. No other equipment was changed, although I want to get an Orbi kit soon. I would call Comcast and see if they can re-provision the modem. If you want to know more or withdraw your consent to all or some of the cookies, please refer to the, N600 wifi dsl modem router BR500 VPN Currently Experiencing Intermittent Connectivity Issues. If so, which router is it? I'll continue working the issue with Untangle, since it's likely related to an issue with DHCPv6 / Native IPv6 / stateless / PD / RA, or a block of ICMPv6 traffic. This removes some of the chances of lines issues. This topic has been marked solved and closed to new posts due to inactivity. Does anyone who has Xfinity gig have any suggestions or found a solution? It's pulling a class A IPv4 address (73.x.x.x/23) without issue, but IPv6 is completely blank. An informational IPv6 screen in the Advanced tab, or perhaps adding a line for "IPv6 Prefix Delegation" under Modem Status might help the more savvy user troubleshoot. Xfinity Gigabit ~> Orbi WiFi 6 DOCSIS® 3.1 Mesh WiFi System with Built-in Cable Modem (CBK752)Tips: Orbi's Hidden Secrets | Orbi LEDs Diag | Ethernet Backhaul | Sync Orbi/Satellite | Unbricking Orbi. Event Type Code: 3; Chan ID: N/A; DSID: �; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A. Plugging a laptop directly into the port I used for the firewall and power-cycling the CM1100 resulted in the laptop pulling an IPv6 address (2001::x) and Class A IPv4 address. I also ran a few speed tests before disconnecting the Xfinity modem and they were all in the correct range (9xx). It keeps posters from being confused as to the OP's responses and your responses. In the meantime, I'm going to dig around for an old router (I know I've got a WNDR3400v2- trying to find one with 100/1000 ports) that I can slap pfSense or WRT on to muck around with as an interim solution. And this was with the router in the loop as well. I don't think this issue is about my other equipment becuase I didn't change anything, but I guess you never know. WiFi 6 Access Points and devices are the future of WiFi. Firmware on it? 2) Tried several different Cat5e and Cat6 cables. I was asking a question in a nice way and it looks to be the absolute same issue. What do you mean by uncorrectables? Now when I run speed tests I get anywhere from 200-400 Mbps depending on which website test I use. The CM1100 is a modem, not a (modem+)router. Do you mean Nighthawk(modem+)_router_ products? A technician has just been here. Again, I did get the full (8-900) with the XB6 modem before swapping to the Netgear CM1100. View online or download Netgear CM1100 User Manual ;CM-MAC=14:59:c0:77:84:88;CMTS-MAC=dc:eb:94:b5:49:5f;CM-QOS=1.1;CM-VER=3.1;2019-03-08, 09:22:51 Warning (5) Unicast DSID PSN startup error2019-03-08, 09:19:10 Warning (5) REG-RSP-MP Mismatch Between Calculated Value for P1.6hi Compared to CCAP Provided Value;CM-MAC=14:59:c0:77:84:88;CMTS-MAC=dc:eb:94:b5:49:5f;CM-QOS=1.1;CM-VER=3.1;Time Not Established Notice (6) Honoring MDD; IP provisioning mode = IPv6Time Not Established Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=14:59:c0:77:84:88;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;2019-03-08, 09:17:57 Critical (3) Resetting the cable modem due to docsDevResetNow, ***** Begin Connection Status Paste *****Startup ProcedureProcedure Status CommentAcquire Downstream Channel 663000000 Hz LockedConnectivity State OK OperationalBoot State OK OperationalSecurity Enable BPI+IP Provisioning Mode Honor MDD IPv6 onlyDownstream Bonded ChannelsChannel Lock Status Modulation Channel ID Frequency Power SNR / MER Unerrored Codewords Correctable Codewords Uncorrectable Codewords1 Locked QAM256 29 663000000 Hz 0.1 dBmV 39.3 dB 66274763 0 02 Locked QAM256 1 483000000 Hz 0.8 dBmV 40.0 dB 65004341 0 03 Locked QAM256 2 489000000 Hz 0.7 dBmV 40.2 dB 65008211 0 04 Locked QAM256 3 495000000 Hz 0.7 dBmV 40.1 dB 65012101 0 05 Locked QAM256 4 507000000 Hz 0.8 dBmV 40.0 dB 65015501 0 06 Locked QAM256 5 513000000 Hz 0.8 dBmV 40.1 dB 65019161 0 07 Locked QAM256 6 519000000 Hz 0.9 dBmV 39.9 dB 65022994 0 08 Locked QAM256 7 525000000 Hz 1.0 dBmV 39.9 dB 65027275 0 09 Locked QAM256 8 531000000 Hz 0.9 dBmV 39.7 dB 65030877 0 010 Locked QAM256 9 543000000 Hz 0.8 dBmV 39.8 dB 65034499 0 011 Locked QAM256 10 549000000 Hz 0.8 dBmV 39.8 dB 65038357 0 012 Locked QAM256 11 555000000 Hz 0.8 dBmV 39.9 dB 65042004 0 013 Locked QAM256 12 561000000 Hz 0.8 dBmV 39.8 dB 65045815 0 014 Locked QAM256 13 567000000 Hz 0.6 dBmV 39.8 dB 65049641 1 015 Locked QAM256 14 573000000 Hz 0.7 dBmV 39.7 dB 65053355 0 016 Locked QAM256 15 579000000 Hz 0.6 dBmV 39.8 dB 65057182 0 017 Locked QAM256 16 585000000 Hz 0.6 dBmV 39.8 dB 65060551 1 018 Locked QAM256 17 591000000 Hz 0.5 dBmV 39.5 dB 65064923 0 019 Locked QAM256 18 597000000 Hz 0.6 dBmV 39.6 dB 65068373 0 020 Locked QAM256 19 603000000 Hz 0.6 dBmV 39.5 dB 65072352 2 021 Locked QAM256 20 609000000 Hz 0.4 dBmV 39.5 dB 65076023 0 022 Locked QAM256 21 615000000 Hz 0.3 dBmV 39.4 dB 65079762 5 023 Locked QAM256 22 621000000 Hz 0.1 dBmV 39.2 dB 65083397 0 024 Locked QAM256 23 627000000 Hz 0.1 dBmV 39.4 dB 65087076 4 025 Locked QAM256 24 633000000 Hz 0.0 dBmV 39.3 dB 65090894 0 026 Locked QAM256 25 639000000 Hz -0.1 dBmV 39.2 dB 65094879 0 027 Locked QAM256 26 645000000 Hz -0.1 dBmV 39.0 dB 65098430 0 028 Locked QAM256 27 651000000 Hz -0.1 dBmV 39.1 dB 65102002 3 029 Locked QAM256 28 657000000 Hz -0.2 dBmV 39.2 dB 65105887 1 030 Locked QAM256 30 669000000 Hz 0.3 dBmV 39.4 dB 65106854 2 031 Locked QAM256 31 675000000 Hz 0.3 dBmV 39.3 dB 65107555 0 032 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0 0Upstream Bonded ChannelsChannel Lock Status Modulation Channel ID Frequency Power1 Locked ATDMA 1 30100000 Hz 47.8 dBmV2 Locked ATDMA 2 36500000 Hz 47.3 dBmV3 Locked ATDMA 3 17300000 Hz 47.8 dBmV4 Locked ATDMA 4 23700000 Hz 47.8 dBmV5 Not Locked Unknown 0 0 Hz 0.0 dBmV6 Not Locked Unknown 0 0 Hz 0.0 dBmV7 Not Locked Unknown 0 0 Hz 0.0 dBmV8 Not Locked Unknown 0 0 Hz 0.0 dBmVDownstream OFDM ChannelsChannel Lock Status Modulation / Profile ID Channel ID Frequency Power SNR / MER Active Subcarrier Number Range Unerrored Codewords Correctable Codewords Uncorrectable Codewords1 Locked 0, 255 159 722000000 Hz 1.9 dBmV 38.5 dB 1126 ~ 2969 182185399 127203422 02 Not Locked 0, 255 0 0 Hz -1.4 dBmV 0.0 dB 0 ~ 4095 0 0 0Upstream OFDMA ChannelsChannel Lock Status Modulation / Profile ID Channel ID Frequency Power1 Not Locked Unknown 0 0 Hz 0 dBmV2 Not Locked Unknown 0 0 Hz 0 dBmVCurrent System Time: Fri Mar 08 09:43:00 2019. [...]. As with _which_ "other Nighthawk products"? Your CM1100 can only support one wired Ethernet connection at a time. Netgear CM1100 Pdf User Manuals. Hello, I just recently swapped out my Comcast Xfinity XB6-T modem for the CM1100. We hope you'll join the conversation by posting to an open topic or starting a new one. For more information: How can I troubleshoot my cable modem? Comcast does DHCPv6 for the routers and provides a delegated Prefix (PD) along with it. Also, do you have any filters on the line connected to the modem? I replaced our C7100V with a new CM1100 yesterday. I am now no longer getting the gigabit speed (or 9xx) that I was previously. My options for IPv6 on the WAN side are Auto (SLAAC/RA), Static, or disabled. Tier 1 support is absolutely useless in this regard- the last one I spoke with didn't even know what DHCPv6-PD was, and could only give me the Class A IPv4 address. Ok, will get a screen print. If you want assistance with this please start your own thread for this problem instead of using someone else's. Also, make sure they have pushed the most up to date firmware to the modem. Also, might also want to check out this thread, which tracks a similar issue with CM1100. A Comcast tech did came out just the other day and checked the signal strength on his handheld and said it was some of the best he has ever seen in my area. That will give a definitive answer where the problem lies. I've tried shutting down the firewall and restarting the CM1100, then restarting the firewall, and same result. Things I've done to troubleshoot: 1) Factory Reset Modem. @JDoggery, if you still have the old modem lying around, swap it back in and see if you can still get the expected speed. Troubleshooting is going to follow a lot of the same questions (so put the responses in your forums post) but your house/equipment is going to be differnt. sjbhh. There's no signal errors or uncorrectables there. I'm also engaging Comcast to see if it's on their end, and will update here with anything I find out.

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