DNS issues with Purple
I'm facing the same issues reported here on these 2 threads.
https://www.reddit.com/r/firewalla/comments/sbvit9/dns_troubles_with_local_firewalla_dns/
But since both threads are quite old and I couldn't find a solution I think a new one should be created.
I noticed that from time to time devices are losing DNS, almost as if a firewall is blocking the requests.
Initially, I thought it was bound to a W11 device but I also faced the same issue with an Android device and the solution was to either reboot or change the wireless connection to a different SSID.
My W11 is wired and Android wireless.
I tried to run a nslookup when my W11 faced the issue and this is the output.
nslookup google.com
DNS request timed out.
timeout was 2 seconds.
Servidor: UnKnown
Address: 192.168.129.1
DNS request timed out.
timeout was 2 seconds.
DNS request timed out.
timeout was 2 seconds.
DNS request timed out.
timeout was 2 seconds.
DNS request timed out.
timeout was 2 seconds.
-
My FWP is configured in router mode and since its also the DHCP the DNS being in used is the router one. In this case 192.168.129.1
I'm using DoH and all 4 servers are enabled. Ping to 8.8.8.8 and 1.1.1.1 does work, actually, I'm using them now because it's quite annoying to keep rebooting or changing DNS settings to make my PC able to browse or connect to games again.
I'll revert to DHCP once again to run more tests once it breaks.
-
In the end, the issue was triggered by my Bitdefender detecting the Firewall scans and blocking it.
They have this info on their support page as well - https://help.firewalla.com/hc/en-us/articles/360009401874-Router-Compatibility
-
Bitdefender: We do know a few users run Firewalla with Bitdefender in router mode.
Bitdefender Total Security: Firewalla Device Port Scan feature is reported to be NOT compatible with Bitdefender's Port Scan Protection, which may impact the whole network. Disable either Device Port Scan on Firewalla Box or Port Scan Protection on Bitdefender will solve the problem.
-
Wow. I can't believe I found an applicable thread that may solve this problem!
Specifically, I too am seeing:
- Random/intermittent DNS resolution failures that last several minutes before restoring normally
- Specific to my laptop, where other devices are not affected
- Ping using IP address works fine
- DNS resolution using a different server works fine
My Setup is a Firewalla Purple, using it for DHCP + DNS, and my Laptop has Bitdefender on it.
I have configured my Firewalla not to port scan the laptop; will see if this resolves the intermittent issue over time.
Thanks to those above! -
Since a few months, same issue here... All works fine, suddenly internet drops out. Figured out it was a DNS issue. Local network works, just not internet. Set the server to 8.8.8.8 and all works fine.
Read this post and switched off the port scan. Restarted the PC and all works ok now. However, that's often the case after a restart. Let's see if the problem reappears with the port scan off.
However... I have also had this issue on my Android phone. I do run ESET Security (paid full version) on my phone, no idea if that could make a difference as well.
I'll follow this thread ;-)
Please sign in to leave a comment.
Comments
9 comments