DNS Issues

July 19, 2023 02:22

Wondering if anyone has been having any DNS Issues lately. I've had no problem with anything until about a week ago. Then randomly I get DNS Server Fail. My setup is Spectrum Modem to Gold+ in router mode. I had DNS for my LAN1 pointed to a Pi-Hole which then forwarded requests to a Windows DNS Server 2012 R2, which in turn forwards to Google. I took Pi-Hole down and now have everything pointed to my Windows 2012 R2 Server.

Everything will be fine, then while visiting a website, it will randomly fail. Go in through terminal and preform a nslookup on any domain and will get a serverfail, even specifying a different DNS to ask, still get a Server Fail (nslookup google.com 8.8.8.8), continue to retry the same request over and over again and it will eventually respond back with the ip address.

Any suggestions?

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8 comments

Firewalla

July 19, 2023 02:26
Best to eliminate Windows server from the picture as well and see if everything works. (using everything native in firewalla). If that works, you isolated the problem to windows ....
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Stuart

July 19, 2023 10:53
"If that works, you isolated the problem to windows ...."

Windows is often a problem. :-)
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James Willhoite

July 19, 2023 11:48
I've removed the windows server and have it going to just the Firewalla. So far I haven't noticed anything, but it was intermittent before.
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James Willhoite

July 24, 2023 12:12
Update: So I figured out that even though I have IPv6 turned off for my LAN (under "Network") there were a few devices (my main Mac Computer I use all day) somehow was assigned a IPv6 Address. Since it had a IPv6 address it was trying to query DNS with said IPv6 Address and would fail since it did not have a IPv6 DNS to query. That was why it was random, refreshing the page a few times would trigger it to send via IPv4 and it would resolve and navigate to where it was going..... I was also having issues streaming to my HomePods from my Mac. If I told iTunes to only use the HomePod via the control panel, it would work, but if I just did the AirPlay from iTunes itself it would fail.

I've activated IPv6 on my network and everything is running smooth now. DNS is resolving and AirPlay is working. All running smooth now. I also put my Windows DNS server back into the mix and have not had an issue.
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Firewalla

July 24, 2023 17:00
Are the assigned IPv6 addresses start with fxxx:?
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James Willhoite

July 24, 2023 17:03
fe80 and 2603 .... For Instance my MacBook Pro has 5 IPv6 Addresses, the fe80 is the link-local address (x1) and the 2603 are public (x4) (I believe)
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Firewalla

July 24, 2023 17:45
How long did you wait between turning off ipv6 and then test the devices? The DHCP lease time is 24 hours by default, so if you are doing anything within 24 hours, the client may think v6 is still up.
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James Willhoite

July 24, 2023 17:56
IPv6 was tuned off (Under Network Settings of the FWG+). I'm not sure how they get an address. I have since went ahead and Turned it on so now all devices get IPv6 addresses and don't have any more issues.
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