Troubles with DNS (potentially more?)

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SSGTSemperFi
DD-WRT Novice


Joined: 25 Jun 2019
Posts: 2

PostPosted: Tue Jun 25, 2019 14:59    Post subject: Troubles with DNS (potentially more?) Reply with quote
I hope this is the correct sub as i'm not entirely sure where my issues lie. I'd like to preface this by saying that networking is, by a long shot, not a strong point for me. Essentially, I'm a tech enthusiast who knows how to use Google to solve some of my issues. All I ask for is a little patience helping me solve some issues I have, it'd be greatly appreciated!

Here's a short version of the issue I'm having:

The issue:
Several times an hour (for the most part), over the last 48 hours, my WAN network will go down. There doesn't appear to be any regular pattern to the downtime, they can happen seconds, minutes, or hours apart. So far as I'm able to tell, my LAN network is also down during this time, as i'm unable to access either the modem or router configuration addresses (would there be a way to verifiable test this, given the random and unpredictable time frame that the issue presents as?). The outage will be for an incredibly short period of time, some as quick as 1-2 seconds, the average being 10-15 seconds. Running network diagnostics during this time always produces a result of either "The DNS server isn't responding" (very common), or a "Your computer appears to be correctly configured, but the device or resource (DNS server) is not responding" (uncommon)

The hardware:
Netgear R6400 running DD-WRT (v3.0-r37015m) (so far as I'm able to find, the most up-to-date version) Been running the custom firmware for a little over a month.
Netgear CM600, stock firmware (V1.01.14) (so far as I'm able to tell, the most recent version) installed roughly a week ago, replacing an SB6121. The SB6121 was regularly producing T3, T4 and T6 timeout errors. The CM600 does not appear to have fully resolved the timeout errors as two T6 errors have occurred since the installation
(connection signal readouts if you'd like to see them)
Quote:
Startup Procedure
Procedure Status Comment
Acquire Downstream Channel 705000000 Hz Locked
Connectivity State OK Operational
Boot State OK Operational
Security Enable BPI+
IP Provisioning Mode Override MDD IPv6 only

Downstream Bonded Channels
Channel Lock Status Modulation Channel ID Frequency Power SNR Correctables Uncorrectables
1 Locked QAM256 31 705000000 Hz 0.2 dBmV 40.5 dB 0 0
2 Locked QAM256 3 531000000 Hz 0.1 dBmV 41.6 dB 0 0
3 Locked QAM256 4 537000000 Hz 0.1 dBmV 41.6 dB 0 0
4 Locked QAM256 5 543000000 Hz 0.1 dBmV 41.6 dB 0 0
5 Locked QAM256 7 555000000 Hz 0.3 dBmV 41.5 dB 0 0
6 Locked QAM256 8 561000000 Hz 0.3 dBmV 41.5 dB 0 0
7 Locked QAM256 9 567000000 Hz 0.4 dBmV 41.6 dB 0 0
8 Locked QAM256 10 573000000 Hz 0.3 dBmV 41.6 dB 0 0
9 Locked QAM256 11 579000000 Hz 0.4 dBmV 41.6 dB 0 0
10 Locked QAM256 12 585000000 Hz 0.3 dBmV 41.5 dB 0 0
11 Locked QAM256 13 591000000 Hz 0.3 dBmV 41.5 dB 0 0
12 Locked QAM256 14 597000000 Hz 0.2 dBmV 41.4 dB 0 0
13 Locked QAM256 15 603000000 Hz 0.3 dBmV 41.4 dB 0 0
14 Locked QAM256 16 609000000 Hz 0.1 dBmV 41.2 dB 0 0
15 Locked QAM256 18 621000000 Hz 0.1 dBmV 41.1 dB 0 0
16 Locked QAM256 19 627000000 Hz 0.2 dBmV 41.2 dB 0 0
17 Locked QAM256 21 639000000 Hz -0.3 dBmV 42.3 dB 0 0
18 Locked QAM256 22 645000000 Hz -0.2 dBmV 42.2 dB 0 0
19 Locked QAM256 24 657000000 Hz -0.5 dBmV 42.0 dB 0 0
20 Locked QAM256 25 663000000 Hz -0.6 dBmV 41.9 dB 0 0
21 Locked QAM256 26 669000000 Hz -0.6 dBmV 41.9 dB 0 0
22 Locked QAM256 28 681000000 Hz -0.4 dBmV 41.9 dB 0 0
23 Locked QAM256 29 687000000 Hz -0.5 dBmV 41.8 dB 0 0
24 Locked QAM256 30 699000000 Hz -0.2 dBmV 41.9 dB 0 0

Upstream Bonded Channels
Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power
1 Locked ATDMA 65 5120 Ksym/sec 17800000 Hz 46.5 dBmV
2 Locked ATDMA 66 5120 Ksym/sec 24200000 Hz 46.8 dBmV
3 Locked ATDMA 67 5120 Ksym/sec 30600000 Hz 47.3 dBmV
4 Locked ATDMA 68 5120 Ksym/sec 37000000 Hz 47.3 dBmV
5 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
6 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
7 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
8 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV

Current System Time: Tue Jun 25 06:25:22 2019



Five wireless clients

3x iPhones (7+, 8, 8+)
1x Google Home Mini
1x TP-Link Smart Plug

One wired client (my PC - Windows 10 v1903)

The configuration (as it relates to DNS, ask if you need to know more):
Attempted using (ipv4 and ipv6 for the following):
ISP (Spectrum) provided default DNS
OpenDNS
Google Public DNS
Cloudflare DNS

All produced the same result, sporadic, unpredictable DNS errors (timeouts?)

-----

In addition to this, since switching my firmware to DD-WRT, I've had issues with proberly establishing IPv6 connectivity. Functionally, I have it enabled, though I'm struggling to identify where or how ICMPv6 messages are being filtered. Could this be contributing to theses issues?


Any help on this matter would be greatly appreciated!
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Per Yngve Berg
DD-WRT Guru


Joined: 13 Aug 2013
Posts: 5004
Location: Akershus, Norway

PostPosted: Tue Jun 25, 2019 18:19    Post subject: Reply with quote
I presume your R6400 is a V1.

37015 is quite old, and I remember there where bugs in it. ICMP on IPv6 have worked for quite some time.

Here is a working recent build:

ftp://ftp.dd-wrt.com/betas/2019/06-16-2019-r40048/netgear-r6400/netgear-r6400-webflash.bin


PS. Broadcom based routers are discussed in the Broadcom Forum.
SSGTSemperFi
DD-WRT Novice


Joined: 25 Jun 2019
Posts: 2

PostPosted: Wed Jun 26, 2019 3:48    Post subject: Reply with quote
Per Yngve Berg wrote:
I presume your R6400 is a V1.

37015 is quite old, and I remember there where bugs in it. ICMP on IPv6 have worked for quite some time.

Here is a working recent build:

ftp://ftp.dd-wrt.com/betas/2019/06-16-2019-r40048/netgear-r6400/netgear-r6400-webflash.bin


PS. Broadcom based routers are discussed in the Broadcom Forum.


Aplogies forgot to include that part, it's V1, yeah. I'll get it updated and see if the issues persist. It's much appreciated!

I debated between the Broadcom and the general forums as i'm not entirely certain if my issues lie on the router hardware or not. For all I know, my issues lie beyond the scope that this forum deals with, but it's my fourth stop down the line (two other tech forums, a networking subreddit and here) seeking help, thus far, I've not had much luck.
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