4

DNS leak test showing USA cloudflare addresses instead of local NextDNS?

Hi there, I have been using the service for about a week now and have been enjoying the local fast queries and speeds. When I first got my service up and running I had 2 local dns servers powered by nextdns. Now when I am testing for dns leaks I am seeing entries for Cloudflare addresses back to USA - 172.70.37.108

Being in Aus this creates a noticable difference going from <10ms to ~330ms ping response times. Is this a cause of a setting ticked under the performance section in the settings? Again just seeking some clarity about what is causing this. Thanks.

Edit: I have just performed another leak test, no neither NextDNS servers are showing and am getting multiple Cloudflare addresses. I run a PiHole setup and force all traffic through it using the 2x servers provided under my https://my.nextdns.io/ page.

119replies Oldest first
  • Oldest first
  • Newest first
  • Active threads
  • Popular
  • I'm seeing similar “leaks“. 

    I use Safari on Big Sur (latest) with the NextDNS app.

    I haven't seen this behavior on https://dnsleaktest.com, but sometimes on https://browserleaks.com/ip, and always on https://www.dns-oarc.net/oarc/services/dnsentropy.

    Those other IPs from the DNS Oarc page are from Cloudflare somehow. 

    Test:

    "status": "ok",
    "protocol": "DOH",

    … … … "anycast": false, … … … … …

    Like
  • And for https://cmdns.dev.dns-oarc.net, I get a C result (while getting an A without NextDNS enabled).

    Like 1
    • Chris Also I got a C rating with NextDNS, if I use Quad9 directly I get an A.

      I am almost certain in earlier days the NextDNS rating was better

      Safari & Chrome on latest MacOS

      Like 1
    • Mike Brust it’s because of the way our ultra low latency solution work. Try with anycast.dns.nextdns.io ans you’ll get an A. This rating is meaningless anyway.

      Like 2
    • NextDNS thank you

      Like
      • DynamicNotSlow
      • Pro subscriber ✓
      • DynamicNotSlow
      • 1 yr ago
      • Reported - view

      NextDNS doesn't help for me in Edge.

      (i clear OS & Browser DNS cache)

      Like
  • On https://browserleaks.com/dns I sometimes also get Google DNS results in addition to the NextDNS one. The example below was with the NextDNS profile running, so it's not just the app I'm seeing this with. Reloading that page 20-30 times will usually trigger it.

    Like
  • And I can now also see it on https://www.dnsleaktest.com.

    Like
  • https://ipx.ac/run now also shows those DNS leaks.

    Like
  • example nextdns leaking to another resolver did not happen with quad9

    nextdns leaking to cloudflare https://1drv.ms/v/s!Ao_cI16Qge_xa3J2wGVU4q-EEj4

    quad9 no leaking https://1drv.ms/v/s!Ao_cI16Qge_xbLJM4djQP7oyM20

    Like 2
  • @Nextdns is there anyone from nextdns looking into this DNs leak issue ? I have similar issues posted in another thread-

    https://help.nextdns.io/t/m1h16c3/block-public-dns-like-google-and-other-malware-dns

    Like 1
  • I have a theory and I would like to ask everyone what are the main browsers you guys use, I for example use Brave and I noticed that several who are having DNS Leak are doing it for Brave and by the looks of it, Brave, well, it contacts Cloudflare and Google servers from time to time, which may be the cause of the mega leak we're noticing:

    If you’re on Linux curl the static1 link. curl --head static1.brave.com, if you want proof of even further telemetry: it lists cloudfare and google, two unnecessary domains, but most importantly telemetry domains.

    Source: https://www.reddit.com/r/privacytoolsIO/comments/nvz9tl/brave_is_not_private/

    I'm asking this, because I decided to change to another DNS provider (ControlD) and the leak hasn't stopped, like, it's gone down, there are no more dozens of servers, at most, only three (All from Cloudflare), but it still goes on, so I decided it would be good to ask which browser you are using and if the leak problem seems to be worse on some specifics than others, as those who seem to use Firefox aren't getting the same level of leaks as those who auditioned for Brave. So, I think it would be good to do this comparison, as it might not be a NextDNS problem, but a browser issue (Since at least for me, I'm testing another Provider and the problem hasn't stopped, but the leak has decreased a lot).

    Like
      • Chris
      • Chris.6
      • 1 yr ago
      • 2
      • Reported - view

      Shadow Colossus I only ever use Safari and Firefox (on macOS Big Sur) and the tests I posted above were all done with those two browsers, so I don't think it's specific to Brave/Chromium.

      Like 2
    • Chris I didn't say specific, I said that on some browsers the leak seems to be worse than on others. For example, from what I've seen, the leak looks worse in Brave than in Firefox, but there's still a leak, you know? so my theory is that something is happening inside browsers that is causing DNS leaks. Or it could be a problem that is affecting these two providers in particular for some reason, I just know that before using ControlD, I was using NextDNS through YogaDNS in the recommended documentation settings and there was a huge leak to Google and Cloudflare, so, I thought Brave can be worse because they contact the servers of these two constantly differently from other browsers. But well, as I said, it's a theory, nothing concrete.

      Like
      • Chris
      • Chris.6
      • 1 yr ago
      • 1
      • Reported - view

      Shadow Colossus I can say that I have not seen any differences between Firefox and Safari and get between 3 and 87 additional DNS servers listed, usually from Cloudflare and Google, tested on 3-4 different sites listed above.  

      Like 1
      • Kummas
      • Kummas
      • 1 yr ago
      • 1
      • Reported - view

      Shadow Colossus  I have a python code that runs on time to time, the leaks do appear and I have it configured as per the nextdns documentation in my router.

      Like 1
    • Kummas 

      So I throw my theory in the trash. I honestly have no idea what else it might be. Has anyone here thought of trying to post about these leak issues on privacytoolsIO? Because of what kind, in the situation we're finding ourselves in, the only reason we know these leaks are happening is because people here do periodic DNS leak tests from what I understand, imagine how many people who might be going through that and don't know because they don't do the dns leak tests periodically?

      Honestly, I don't use NextDNS for privacy, but for security, but there are people who use NextDNS together with VPN and I think NextDNS is very wrong to know of a problem involving massive leak for more than a month without giving any official statement at least warning people who use their service along with VPN about the huge leak that is happening for them to take appropriate action until the problem is fixed. So, I'm actually going to wait a few more days before deciding whether or not I should post about it on Reddit myself, because honestly, it certainly shouldn't be an issue on our side considering that every day a new person appears with the same problem.

      Like
      • DynamicNotSlow
      • Pro subscriber ✓
      • DynamicNotSlow
      • 1 yr ago
      • 1
      • Reported - view

      Shadow Colossus Edge on Windows, Safari on iOS: no leaks

      Like 1
      • Rownan
      • Rounak_Kabir
      • 1 yr ago
      • 2
      • Reported - view

      Shadow Colossus And interestingly it doesn't happen with some other ones like Quad9, BlahDNS, Cloudfare, CZ.NIC or AdGuard DNS. This easily outweighs the similarities you found between NextDNS and ControlID.

      I'd really like to see if someone with a paid plan faces this. I don't suspect anything fishy but I want to be absolutely sure that this problem has hit many indefinitely.

      And it's really sad to see NextDNS sit quietly on this issue for so long. Just like you said they could've issued a public warning or at least communicated that they're looking into this issue. 

      Like 2
      • Chris
      • Chris.6
      • 1 yr ago
      • 2
      • Reported - view

      Rownan I've been using the paid plan since day 1 and have this issue. 

      Like 2
    • Rownan You know, the worst thing about what's going on is that they've been accused of a leak issue before involving Email and it took a guy to post on Privacy's Reddit for NextDNS to publicly speak about the possible issue : https://www.reddit.com/r/privacy/comments/jswghu/nextdns_is_leaking_your_email_address_to/ - They already have a history involving this type of issue, which makes the situation even worse, as you would expect they would have learned the first time something like this rebounded and got really bad for them that they didn't talk or respond on the subject until it reached a level they could no longer ignore. Honestly, the way it's going, I believe it's a matter of time before someone decides to do the same thing this guy did to try to get NextDNS to inform their users about it if they continue to be silent. Thank you for your contribution.

      Like
  • Myth0ne said:
    So for your paid service is it just the logging and blocking functionalities for infinite queries that are enabled?

    Yeah. The paid plan gives you unlimited full-service queries. For $2/mo, it's one of the better deals on the internet.

    Like 1
  • Same here, I tried using all DNS providers known to me from BlahDNS to Google and in all usual configurations. Tested on multiple websites.

    None of them leaked except for NextDNS. Another interesting point to note is that after testing with other DNS providers when I switch to NextDNS, some of servers from the previous tests show up on https://browserleaks.com/dns , such as WoodyNet of Quad9 or Cloudfare, Ashburn (which is very frequent in the results) . However, this is not true for other providers, when switched to say BlahDNS I only see the servers that I saw previous month.

    I'll be adding pictures once I redo the tests later since I forgot to take some screenshots.

    However, something is wrong NextDNS's side for sure. It maybe a bug given how frequent it is with other users as well.

    Like 1
  • Here are my DNS leaks -

     [United States of America, AS701 MCI Communications Services Inc. d/b/a Verizon Business]

    You use 20 DNS servers:
    2a00:1450:400c:c08::110
     [Belgium, AS15169 Google LLC]
    2a00:1450:400c:c0d::101
     [Belgium, AS15169 Google LLC]
    2a0b:4342:1a32:f:5054:ff:fe48:d17f
     [United States of America, AS35487 Misaka Network Inc.]
    2a00:1450:400c:c00::104
     [Belgium, AS15169 Google LLC]
    2a00:1450:400c:c0d::107
     [Belgium, AS15169 Google LLC]
    2a00:1450:400c:c08::105
     [Belgium, AS15169 Google LLC]
    2a00:1450:400c:c00::107
     [Belgium, AS15169 Google LLC]
    2a00:1450:400c:c01::108
     [Belgium, AS15169 Google LLC]
    2a00:1450:400c:c1b::105
     [Belgium, AS15169 Google LLC]
    2a00:1450:400c:c00::105
     [Belgium, AS15169 Google LLC]
    2a00:1450:400c:c0a::107
     [Belgium, AS15169 Google LLC]
    2a00:1450:400c:c1b::10c
     [Belgium, AS15169 Google LLC]
    2a00:1450:400c:c0a::109
     [Belgium, AS15169 Google LLC]
    74.125.47.11
     [Belgium, AS15169 Google LLC]
    74.125.47.130
     [Belgium, AS15169 Google LLC]
    74.125.47.155
     [Belgium, AS15169 Google LLC]
    74.125.73.70
     [Belgium, AS15169 Google LLC]
    74.125.73.77
     [Belgium, AS15169 Google LLC]
    74.125.73.82
     [Belgium, AS15169 Google LLC]
    199.119.65.94
     [United States of America, AS57695 Misaka Network Inc.]

    Like 1
    • Kummas what is your platform? How is nextdns setup? Are you using a VPN? 

      Like 1
      • Kummas
      • Kummas
      • 1 yr ago
      • 1
      • Reported - view

      NextDNS OpenWRT router with Dnsmasq . The leaks are determined through the crontab python script that hits an API from bash.ws. Like I said on the other posts, the leak happens on time to time. There are instances that my home network was compromised with the ring alarm by hijacking nextdns by blocking “ring.solutions”. The workaround was just adding ring.solutions to the allow list.

      Like 1
      • Kummas
      • Kummas
      • 1 yr ago
      • 1
      • Reported - view

      NextDNS Forgot to mention, no VPN used.

      Like 1
      • Kummas
      • Kummas
      • 1 yr ago
      • 1
      • Reported - view

      NextDNS  some more targeted  leaks -

      You use 21 DNS servers:
      2a00:1450:400c:c08::119
       [Belgium, AS15169 Google LLC]
      2a0b:4342:1a32:f:5054:ff:fe48:d17f
       [United States of America, AS35487 Misaka Network Inc.]
      2a00:1450:400c:c08::103
       [Belgium, AS15169 Google LLC]
      2a00:1450:400c:c08::117
       [Belgium, AS15169 Google LLC]
      2a00:1450:400c:c0a::10b
       [Belgium, AS15169 Google LLC]
      2a00:1450:400c:c1b::103
       [Belgium, AS15169 Google LLC]
      74.125.47.3
       [Belgium, AS15169 Google LLC]
      74.125.47.13
       [Belgium, AS15169 Google LLC]
      74.125.47.136
       [Belgium, AS15169 Google LLC]
      74.125.47.144
       [Belgium, AS15169 Google LLC]
      74.125.47.147
       [Belgium, AS15169 Google LLC]
      74.125.47.151
       [Belgium, AS15169 Google LLC]
      74.125.73.82
       [Belgium, AS15169 Google LLC]
      74.125.181.4
       [Belgium, AS15169 Google LLC]
      74.125.181.5
       [Belgium, AS15169 Google LLC]
      74.125.181.8
       [Belgium, AS15169 Google LLC]
      172.253.215.13
       [Belgium, AS15169 Google LLC]
      172.253.248.35
       [United States of America, AS15169 Google LLC]
      172.253.248.36
       [United States of America, AS15169 Google LLC]
      172.253.248.41
       [United States of America, AS15169 Google LLC]
      199.119.65.94
       [United States of America, AS57695 Misaka Network Inc.]

      Conclusion:DNS may be leaking.

      Like 1
    • Kummas are you using a VPN? Which platform is it? How did you setup nextdns?

      Like 1
      • Kummas
      • Kummas
      • 1 yr ago
      • 1
      • Reported - view

      NextDNS same as mentioned before, openwrt with dnsmasq configuration. This probably happened one time today for every 5 mins crontab check for dnsleak. No VPN and the configuration is as per the NextDNS standard or steps! 

      Like 1
    • Kummas can you please show your dnsmasq config?

      Like 1
      • Kummas
      • Kummas
      • 1 yr ago
      • 1
      • Reported - view

      NextDNS Is there anyway to chat through emails personally on the configuration info? Also, who is constant company which appears on the leaks?

      207.246.91.188
       [United States of America, AS20473 The Constant Company LLC]
      2001:19f0:5:663d:5400:2ff:fece:2f14
       [United States of America, AS20473 The Constant Company LLC]

      Like 1
    • Kummas you can DM us (only for private info). The AS20473 is one of our hosting providers, this is not a leak.

      Like 1
  • I noticed that I commented that ControlD was also experiencing a leak similar to NextDNS I forgot to print a screenshot showing about it, so I decided to come here to show that this is a problem that is not only affecting NextDNS, but that it is also affecting another service similar to NextDNS (I hope this information can be useful for the quest to find a solution to this problem.): 

    Like 1
  • https://www.reddit.com/r/Windscribe/comments/p452iw/dns_leak/ - I found this when I was back about DNS leakage and I think this might be useful for some people. Me for example, I don't understand how they fixed it, but it has something to do with the Windows settings that changed after an update. I hope this can be useful.

    Like
  • It is quite possible that NextDNS is using Cloudflare and Google as their hosting provider. They might be running microservices at the edge from these companies. Hence, it doesn't mean that NextDNS is leaking our DNS requests to Cloudflare or Google, instead the resolutions are happening at the hosting provided by both these companies. 

    To bolster my theory, I can see Digitalocean as the ISP in my DNS leak test. This means, NexDNS has a server at DO close to my location to support my DNS Queries.

    Like 1
  • Here to chime in and repeat a lot of what has already been mentioned here. I have the same problem with DNS leaks and I have noticed this has been happening (and like this) for months. Does not matter if it is router, OS, browser, etc. configured. Does not matter if IPV4 or IPV6 is used or not used. When running the DNS leak test some times it is fine some times it is not. If you keep repeating the test it happens eventually. It is not unknown for the test to report back with hundreds of servers. Doing a test now and it says, "Found 163 Servers, 8 ISP, 9 Locations".

    I have noticed if only DOH is configured and when running the Browser Leaks test some of the DNS queries are not being resolved over DOH. You can watch the queries been resolved in the logs tab and enabling live logging. The lock icon is missing from some of these queries.

    To confirm, if I use another DNS resolver such as Cloudflare, Quad9, etc. this never happens. Only NextDNS. I suspect it is a misconfiguration or issue with NextDNS servers and its been like this for a long time.

    Like 2
    • Teddy Rogers there is no “bad server configuration” that would lead to that in the way our infra is built. The leak has too happen on the client side or somewhere in the middle.

      For every report of a DNS leak, please provide more info on the platform used and how nextdns is setup (with as much details as possible). Leaks can happen for different reasons and we can’t help without more details on your setup.

      Like 1
      • benot
      • benot
      • 1 yr ago
      • 1
      • Reported - view
      benot said:
      1dr

       NextDNS I think this video was very clear to explain dns leaking to another server

      Like 1
  • I have had similar issues.  Let's put on our tinfoil thinking caps and consider a far simpler explanation   I think we have to consider  that this is mostly the NSA and at times the UK and other intelligence agencies routing entire domains through their national networks for packet sniffing or whatever   Snowden had mentioned this before.  The Ashburn location is just the whois registered address, at least one of the geolocations in Ashburn is that registered address.  The other precise Ashburn geolocation always returns a specific location to a specific parking place in Ashburn🙄.  It's likely DNS spoofing or cache poisoning or something.  I've really been digging into whois and doing multiple trace routes and checking multiple geolocation protocols.  If NextDNS has servers in the USA then they are required by CALEA to provide access to the USA government just like any other ISP or phone company in the USA is required to do so, Cloudflare Google, etc.  

    Like
    • Mr. Johnson when one reads about the various taps that individual IT  workers and phone company workers  have discussed over the last 10 years or so simply a tap and then a spoof is enough.  All that nextdns or any DNS provider would know at the highest level is that a court order was sent requiring calea compliance.   Yes.  I agree after my exhaustive research with this issue that the NextDNS rep was right in his speculation. It's something "in the middle.". 

      Like
  • I think maybe I was able to spot this "DNS Leak" or at least I was able to reproduce it several times and noticed this pattern.

    I'm using DOH, so not much to explain about the configuration, so I went to www.dnsleaktest.com with no other browser tabs open and the result of the first image below.

    So I went to nextdns settings and logs and check the option to update the logs automatically  and did a new test and the result is the second image.

    Using the site ncheck.tools I had the same result but using this site and just a refresh in the log using the browser's F5, these "leaks" also appear.

    I can't explain why this is happening, but this is probably the "problem" that many users are reporting here on the community and elsewhere on the internet like reddit.

    Hope this helps.

    Like
  • Complementing the tests, the problem occurs with Chrome, Edge and Firefox.
    
    I decided to do a test with Adguard using the same method and the problem also occurred, only in this case the dns leak occurs for cloudflare while in nextdns it occurs with google.
    
    In both services and in any of the 3 browsers immediately changing the DOH to Quad9 or Google Dns the problem disappears.
    
    The only similarity between nextdns and adguard I see the ".io" domain in the control panel.
    Like
      • Hey
      • Hey
      • 1 mth ago
      • Reported - view

      Cassius M I think it could be something to do with the browsers and setting a custom DNS possibly some sort of a backup system or them checking if other DNS services are working etc.

      Like
      • Cassius M
      • CassiusM
      • 1 mth ago
      • Reported - view

      Hey 

      I don't think so, because this "leak" only occurs with nextdns and adguard, both on the log page or with the log page open.

      Anyway, I only posted this information so that people who are complaining could reproduce it and who knows, the nextdns staff could give some idea of why this happens, but I believe that this will hardly happen...

      I stopped using nextdns exactly because of this, lack of support, problem with routes where here in Brazil I am always redirected to servers in the USA no matter which configuration I use, and believe me I tested all possible ones.

      As I said, I just posted what I found to try to help users who still use the service and in a way were concerned and try to help the nextdns team to give a plausible position to users.

      I appreciate your help too.

      Like
  • Personnally I don't trust 100% all those DNS leak tools. 

    For instance the one I always use, because I found ressourcefull, is https://browserleaks.com/ip

    Despite a correct configuration on my side I always end up with 2 DNS when I do a test. The one from my VPN and the one from NextDNS. However when I refresh the page I only get NextDNS. Never understood why. Oh well! 

    Like
Like4 Follow
  • 4 Likes
  • 1 mth agoLast active
  • 119Replies
  • 3531Views
  • 18 Following