Questions tagged [domain-name-system]

The Domain Name System, usually referred to by the acronym DNS, is a hierarchical, distributed database where the keys are domain names. Questions involving publicly accessible domains should include the real, Fully Qualified Domain Name (FQDN)

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DNS records at Azure and Google - do both need the entire set of records?

We are migrating from Azure to Google. Google is currently storing our DNS records. Simply put, do we need to put all the A records in both places? Or is DNS smart enough to loop through it's list ...
Rob's user avatar
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How to configure client DNS parameters on an oracle 8 distribution?

Using an ansible playbook I add DNS addresses in linux distributions and I would like to know how to configure DNS clients on Oracle 8. I tried to use the ansible playbook to configure them, I would ...
Azal's user avatar
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2 answers
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Make the changing of IP not disconnect Remote Desktop

I have an EC2 on AWS with Windows server. I would like to be able to change its IP very often. At the moment, I create several Elastic IPs and am able to associate one by one to the instance. I got a ...
SoftTimur's user avatar
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Resolve issues with DNSBLOG and b.barracudacentral.org

I am using postfix with DNSBLOG to prevent spam. The postfix main.cf is configured like: postscreen_dnsbl_sites = zen.spamhaus.org=127.0.0.[2..11]*3 b.barracudacentral.org=127.0.0.2*2 DNSBLOG is ...
tillewolle's user avatar
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nslookup error : Non-authoritative answer name

i have DNS Server for local user. when PC user nslookup error name server like this error name how to solved this error. my DNS running on Ubuntu 22.04 thanks
Radit's user avatar
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2 votes
1 answer
109 views

Bind9 extremely slow upstream resolving

I have a bind9 docker container serving DNS for my home lab. It provides a .lan domain for local devices, and a private domain name for my internal services. However, resolving any external DNS entry ...
t348575's user avatar
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38 views

Unable to logon using RDP after domain migration

We have issues after migrating a DC to a new DC. When we attempt to RDP to some of our VMs using the DNS name, it fails. Using the IP address works. This issue only occurs on some VMs. It seems to be ...
Deggenau's user avatar
-1 votes
1 answer
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Linux Bind9 DNS server, configuration throwing errors

I am having problem with DNS configuration in Linux. I am using isc-dhcp-server as DHCP server and bind9 as DNS server, but I it returning me errors. This is my Setup Internet <--enp0s3 interface--&...
mitas1c's user avatar
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Bind9 on Docker can't resolve on host

I have a PC on my local network that will run services that I want to access with URL's instead of IP's. I have followed many guides and articles on how to use Bind9 (and dnsmasq) but always get stuck....
Jonas Birkelöf's user avatar
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Public DNS for a domain on Route 53 and would like to use Azure Private DNS for internal resolution

We are in the process of migrating on premises / datacenter service from colocation to Microsoft Azure. We have several domains, let's call one myapp.com. The myapp.com web server is available to the ...
S.Giacinto's user avatar
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DKIM settings with Amazon SES not finding primary domain

I'm attempting to send email via Amazon SES with a custom domain. I have one domain that works and the DKIM headers that come to my gmail account look like: Authentication-Results: mx.google.com; ...
stdunbar's user avatar
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Setting Up Lua Records for GSLB with PowerDNS in Docker

I am working with a PowerDNS setup within Docker that currently manages zones through files and responds with A records. My goal is to implement Lua Records for GSLB (Global Server Load Balancing) ...
Jay's user avatar
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1 vote
1 answer
99 views

Blocked IP on CloudFlare keeps connecting and attacking server

I have a NodeJS server with HTTPS and certificates. The DNS is on CloudFlare. The host receives a connection every day at 3:32am from 3.8.236.120, an AWS host in the UK. The crawler launches requests ...
miguelmorin's user avatar
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Reroute Android phone emulator to localhost [migrated]

I need to force the Android phone emulator mapping, the way I have it configured in my /etc/hosts on my laptop. So I would want a situation where every time it tries to go to my.great-website.local, ...
Michał J. Gąsior's user avatar
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getting an error that my dnsl has no records

here is my code im so lost any help is greatly appreciated $ORIGIN centos.local. $TTL 86400 @ SOA dnsl.centos.local. hostmaster.centos.local. ( 2001062501 ; serial ...
Dr.slee's user avatar
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42 views

TXT Record only is not resolving Win Server 2012/2008

On my server I have more than 20 domains. all the DNS records are resolving except one domain. for this domain, all the records are resolving such as a,mx, ns, and soa. but all the txt records are not ...
Salman Al-Zabin's user avatar
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2 answers
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How do I cheaply split emails between different servers dependent on the user its sent to?

I'm helping a friend start a small business, he wants an email on his domain ([email protected]) to have access to Google Drive storage to be able to upload files and share them with clients. He also ...
Miles Acq's user avatar
2 votes
1 answer
59 views

The pod's /etc/resolv.conf does not reflect the changes on the host

When my pod's dnsPolicy is set to Default it picks up the DNS servers from the host's /run/systemd/resolve/resolv.conf (as configured by the resolvConf flag in Kubernetes) and stores them in /etc/...
Sam's user avatar
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2 answers
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Microsoft Server 2019 - Limit Recursive DNS Requests to Internal Clients

We have a network with a router and an internal DNS on a Windows Server 2019. The DNS is visible to the outside via a NAT on the router (UDP 53 -> Server IP, this is required because we're a hidden-...
Terminality's user avatar
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156 views

DNS resolution behavior for records with a suffix matching a subzone in route53

Let's say I have a zone example.com in route53 which contains this record: foo.sub.example.com A 1.2.3.4 in that same example.com zone, I also have a delegation and thus NS records for the sub....
persson's user avatar
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Benefits of extra DNS config for Google Cloud Private Google Access

Setup: VM running in a subnet with public NAT enabled. VM has only internal IP address. VM needs to connect to Google APIs and services without traversing public internet. Enabling NAT automatically ...
ipastusi's user avatar
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1 vote
1 answer
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Can I have more than one public keys saved in one selector for dkim?

The question is easy to understand, but it might be confusing. I understand that I can host multiple selectors for a DKIM record, but just out of curiosity, can I have multiple keys per selector in a ...
SUNITA GUPTA's user avatar
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2 answers
227 views

Is it better to redirect root to www or www to root?

This may be a 'fashion' question, but is it better to redirect: https://www.example.com -> https://example.com or https://example.com -> https://www.example.com? I always assumed it was better ...
J. Gwinner's user avatar
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2 answers
47 views

I can't seem to point the correct nameserver to my VPS

I'm hosting my domain on Namecheap and im trying to point my nameservers to connect to my VPS using Webuzo (on Hostinger) it shows this error on my VPS on Webuzo: " This system does not control ...
Demetris's user avatar
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71 views

EKS coredns resolve eks.us-east-1.amazonaws.com

Can't resolve eks.us-east-1.amazonaws.com kubectl exec -i -t dnsutils -- nslookup eks.us-east-1.amazonaws.com Server: 10.100.0.10 Address: 10.100.0.10#53 Non-authoritative answer: *** ...
RoCzu's user avatar
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1 answer
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Windows Server - many event id 4625 authentication failures

In a small network environment, we have one Windows Server with Domain Controller, DHCP and DNS. When every non-domain Windows client connects to the network, a lot of 4625 logon failure events are ...
Fabio S's user avatar
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1 answer
95 views

DNS name resolution for Docker containers not working from Host

I have several Docker containers running in bridge mode and would like to address them by container single label name from my Host. My Host is a Debian Linux System $uname -a Linux sv2 6.1.0-17-amd64 #...
Gill-Bates's user avatar
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CDN routing sometimes sends me to overseas IPs, intermittent

I recently changed ISPs but also swapped out our hardware firewall. Since then I have noticed intermittent CDN issues, seemingly only with Akamai. I got clued into this when numerous sites wouldn't ...
jeremy's user avatar
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Microk8s Cluster - Pods cannot reach nameserver/CoreDNS pod - No route to host

Disclaimer: This is my first question in ServerFault and I'm a complete noob. I have the following set up: remote VM, running CentOS 7, running MicroK8s (v1.28.3). It's a single-node cluster so I have ...
okariotis's user avatar
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0 answers
29 views

Is is possible to set up different DNS records based on the realtime qps using bind?

I'm trying to set up a self hosted DNS server for my website using bind and I want to set it to redirect to a custom error site (set all records to CNAME of error.my.domain maybe) if the qps reaches a ...
Francie Jiang's user avatar
-2 votes
2 answers
160 views

DNS Overwrite for a single domain

I am running on a Mac. I volunteer at a local church. I created a site to site VPN so that I can monitor their traffic and other resources. When I am at the local church, I am unable to connect ...
user2236794's user avatar
1 vote
1 answer
31 views

Can I update SPF using an MX record instead of TXT because I can not edit TXT records during propagation?

I am in the process of moving DNS (not the domain registration though, that's staying with GoDaddy) from GoDaddy to Bluehost for a client. I transferred the DNS two days ago but I can not access the ...
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0 answers
60 views

setting root hints in PowerDNS does NOT work

I would like to create a fully DNS hierarchy on my own for a project. Here is my setup: BIND9 for the Root Nameserver "." (10.0.2.15) BIND9 Authoritative Nameserver for the domain "...
Dennis's user avatar
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0 answers
29 views

How to redirect dns requests made to a subdomain to custom dns server

I have bought my domain mydomain.com from squarespace. I self host my own server on IP1 and I binded mydomain.com to IP1 on squarespace. In my app the client interact with multiple subdomain XXXYYY....
RudeusGreyrat's user avatar
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0 answers
43 views

Technitium: access Apache virtual host by domain name instead of IP address from a mobile device

I am not clear enough on how to configure Technitium DNS server in order to access locally hosted websites from mobile devices, using domain name instead of IP address:port, so Could anyone with ...
jgarcias's user avatar
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0 answers
30 views

Bypass DNS rebinding for localhost

I am encountering more and more issues with an app I created that binds to 127.0.0.1 on an obscure port. I have a domain name - due to needing an SSL cert - that resolves to 127.0.0.1. I have this ...
Dan's user avatar
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62 views

Should I expect better or worse performance using unbound vs google's or cloud flare's dns? Or a with local chache?

Afaik unbound will answer right away if it's cache has the entry, if not it'll do a recursive dns lookup against the root servers, which is what google, cloudflare & others do, aside from privacy/...
Peter's user avatar
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0 votes
1 answer
77 views

DNS TXT record "vs-f1 a mx -all"

I recently took over management of a company's DNS records. Looking at the records, everything seems to be in order. But there is one record I can't figure out what it is for: TXT domain.com "...
dunxd's user avatar
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-1 votes
0 answers
33 views

Windows 10 VM name resolution issues

I have a Windows 10 VM in Azure. I'm testing a web application, but it fails to connect. As I investigate, here's what I'm finding: ping returns incorrect address for host nslookup returns correct ...
Daniel Carrington's user avatar
1 vote
1 answer
120 views

DNS client to lookup CNAME records automatically

We've just migrated to a new internal DNS resolver, and discovered a limitation that impacts our ability to lookup specific records. Our internal (private) authoritative domain is example.net.. We ...
Danielle M.'s user avatar
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0 answers
47 views

DNS error 4011, unable to write, or update

I encountered one intriguing issue with DNS service on a pair of our domain controllers. Frequently, about every half an hour (sometimes skips or shows only on one), I get the error ID 4011. These ...
Pepper's user avatar
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0 votes
2 answers
63 views

Forward example.com website to www.example.com

I am trying to point https://example.com to https://www.example.com Because searching https://www.example.com loads the website with no issues, but searching https://example.com leads to an extremely ...
Saif Azim's user avatar
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0 answers
154 views

How does a web browser use a HTTPS or SVCB DNS Resource Record (RR)?

Background IETF RFC 9460 defines SVCB and HTTPS DNS resource record (RR) which can be used to upgrade connections to HTTPS and also specify the application-layer protocols that are supported (ALPN). ...
Daniel's user avatar
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2 votes
1 answer
87 views

Unspecified DNS error

I run ftp.halifax.rwth-aachen.de, which is a public mirror serving (among other projects) Debian Linux files. Debian regularly checks mirror servers, and often experiences DNS issues for this host. I ...
C-Otto's user avatar
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0 answers
67 views

How to advertise HTTPS RR locally?

Trying to host a HTTP3-only server locally on port 443 and have a local web browser access it. Tested the HTTP3 server directly with a cli client and that is working 👍 Attempting to use a HTTPS DNS ...
Daniel's user avatar
  • 163
0 votes
1 answer
162 views

Combining 2 SPF records with 2 different host names

I have 2 spf records I need to combine. 1st spf record is: Host: front-mail Value: v=spf1 include:sendgrid.net ~all 2nd spf record is: Host: @ Value: v = spf1 include:zoho.jp ~all I've tried to ...
Jaeho Lee's user avatar
0 votes
1 answer
234 views

Windows Server 2022 stops resolving domain names - unsure how to troubleshoot

Recently my Windows Server 2022 Standard installation has been having issues connecting to anything that has a domain name,seemingly at random. Direct IP addresses are fine but anything with a proper ...
Tamerax's user avatar
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0 answers
67 views

RHEL 8 IPA/DNS secondary to Windows AD/DNS

I have a particular scenario that I am trying to implement at work. I work on an enterprise that has both Windows and Linux clients and would like the added Linux benefits of utilizing an IPA server ...
eye4gaught's user avatar
0 votes
1 answer
79 views

Creating a server with fixed IP that can be freely moved among networks

Given a public /24 prefix, announced via BGP, 192.0.2.0/24. I have split this prefix into various smaller networks. I would like to use 1-2 servers for the DNS server (forward and reverse) which needs ...
divB's user avatar
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0 votes
1 answer
63 views

How can I force web request to resolve to external DNS

We are using a split DNS for traffic for our primary domain - external traffic goes to Cloudflare, and internal traffic goes to our windows server DNS, for security reasons. However, for our primary ...
Daryl1976's user avatar
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