DNS & network news

Monthly Archive: October 2017

dnsmasq not taking NetworkManager dns setting (x-post /r/Ubuntu)

Running 16.04, configuring network with NetworkManager, static IP. I’m finding that the DNS setting in NetworkManager seems to be ignored. I get very slow name resolution (browser or nslookup) even thought I have the DNS server in NetworkManager set to 8.8.8.8. If I do an nslookup without specifying server, it goes to 127.0.0.1 (as is expected in the NetworkManager/dnsmasq setup Ubuntu 16.04 uses) and the returns are very slow and unreliable. If I use nslookup and set the server to 8.8.8.8 then my name resolution is fast and reliable. So I don’t think 127.0.0.1/dnsmasq is actually using the 8.8.8.8 that is set in NetworkManager. But I can’t find anything else indicating where dnsmasq is looking upstream. How can I tell where dnsmasq is actually looking? My /etc/NetworkManager/dnsmasq.d folder appears empty. If I force 8.8.8.8 in resolv.conf it seems to improve for a while, but not always, and of course gets re-written to 127.0.0.1 on restart. Any ideas?

submitted by /u/uncre8tv
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Wed Site DNS Not Resolving Randomly

Our school district website is randomly (at least it seems randomly) for some people. I’d say 95% of people have no problem pulling up newburghschools.org but then we have some people that get DNS error when trying to visit the site. It’s a small portion but it seems to be based upon where they are accessing from. A bunch of our administrators went about an hour north of our district and were at a conference at a hotel and on both the hotel wifi and even 4g they would get the error. I don’t have the issue anywhere except sometimes randomly on my 4g lte cell phone. Anything anyone can think of why this might be happening?

submitted by /u/gr00316
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Transfer managed DNS provider

I’m trying to transfer my public managed DNS provider but I have questions since my current setup is weird.

First,
My registrar (some small co) provides my domain name registration but no DNS hosting. Only options to specify NS hostnames.
My DNS hosting is my ISP, no web portal access to zone file for modification (thus the desire to move).

Second,
I need to switch to another provider which will allow me to manage my zone file (i.e. dns.he.net)

I was told that once I created a zone file with the new provider, I need to make sure my NS point to the new provider’s NS.
My question is do I need to change my NS ONLY with the registrar and wait for propagation or do I need to change NS on BOTH the registrar NAthe ISP?

Note that I could transfer the registrar as well (i.e. with GoDaddy transfer service) but the question remains if I need to change the NS in the ISP’s zone file for my domain as well. Thanks!

submitted by /u/julioqc
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Things to check Mom&Pop ISP problems

I was recently switched from 10mbit/1mbit DSL to a 15mbit/2mbit DSL from my local ISP (only other options are satellite, FM, or dialup!) Since the switch I’m getting classic DNS f-up symptoms – slow loading web pages, sometimes timeout/unavailable. Router and modem reset no help, and what really gets me is that manually setting my DNS on my desktops to 8.8.8.8 has been no help either. Can my ISP be screwing with my 8.8.8.8 queries? Possibly a reverse lookup issue on my whole ISP network? Using a Mikrotik, and ISP supplied Zyxel DSL modem. Setting DNS at the router to 8.8.8.8 and 8.8.4.4 seems to be no help either. It’s been 15 years since I managed DNS professionally, forgotten anything that I knew that might be useful. Any tips to try so that I can point out or prove to my ISP they’re jacked up would be appreciated.

submitted by /u/uncre8tv
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