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)
12,574 questions
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AD DNS update works initially for Samba client, then fails
We have a large AD domain with three Windows Server 2022 DCs. DNS registration and renewal works with Windows domain members. I do not have control over the DCs (although I can access them for ...
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Support for CNAMEs in the pfSense DNS Resolver
Some background
I have a home network built on a NetGate 1100 with pfSense. This has been running well for a couple of years with IPv4 only. I have upgraded it now to pfSense 25.07.1
With an IPv4 ...
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File uploads fail when outbound Internet is restricted to specific IP addresses [closed]
I have a CentOS 7 server where outbound Internet is restricted using iptables to specific external IP addresses.
For example using Perplexity’s IP addresses:
sudo iptables -A OUTPUT -d 104.18.26.48 -j ...
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How to set DNS for incorporating Email to mail.domain.org as well as domain.org?
NOTE: I wanted to ask this on StackOverflow but they state that DNS questions must be programming related so this doesn't quite fit that bill.
We have a bunch of domains on a server.
Typical DNS for ...
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Exchange Hybrid Split DNS
Our internal domain is domain.local, and external is domain.com.
Typical split DNS situation. My question is how do people typically handle this?
We are about to start our Exchange migration, and ...
- 1,714
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What are the benefits of storing a hostname in a DNS NS record, instead of the IP?
This question builds on Why don't NS records contain IP addresses?.
I understand that a domain nameserver - say ns1.com - stores NS records as mappings domain-to-hostname. If a client wants to get ...
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Why does Apple have many PTR records and others have none? [closed]
I am investigating reverse DNS (PTR) records and how they are used today.
For example stackoverflow.com resolves to 104.18.32.7 and that IP has zero PTR records (neither does the domain's other IP).
...
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Unbound Cache Stats Not Increasing - still Showing Same Hits/Misses After Days
We configured Unbound on a RHEL-based server ( RHEL 7.9 ) to provide DNS caching. Here’s the relevant part of our /etc/unbound/unbound.conf:
server:
chroot: ""
verbosity: 1
port: ...
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Intermittent nameserver (DNS lookup) failure using postfix/dovecot [closed]
Several months ago I reconfigured my server to dispense with PLESK (I never really used it, it was required by the server service, when they were bought out they didn't care anymore and it was ...
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dnsmasq: map a specific domain to the destination IP address of the incoming lookup query
I have dnsmasq and a Node server running on the same machine. The Node service's listening port is open to all interfaces (0.0.0.0), and whenever dnsmasq receives a query for the domain associated ...
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Failed to remove Windows DNS Server Query Resolution Policy
Attempting to implement DnsServerQueryResolutionPolicy per:
https://learn.microsoft.com/en-us/windows-server/networking/dns/deploy/primary-geo-location
which worked fine in my POC. I implemented it ...
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google compute engine, how to add or change a DNS A record
We have several domains, one of which runs a google compute engine with DNS registered at godaddy but whose primary DNS server is at google.
How does one manipulate the A records for a domain ...
google-compute-engine
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Can you have a standard DNS record alongside wildcard one?
Example:
sub1.example.com. -> 0.0.0.0 (A record)
sub2.example.com. -> 0.0.0.1 (A record)
*.example.com. -> 0.0.0.2 (A record)
Is this a valid configuration?
Will sub1 and sub2 point to .0 ...
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Spamhaus Open Resolver error with own recursive dns
Doesn't the public Spamhaus work reliably anymore?
I have multiple own recursive DNS setups on LAN/localhost without being open resolvers, and from time to time some lookups to zen.spamhaus.org ...
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DNS / email routing without DNS?
I posted a question about this yesterday but it was I guess the wrong question to be asking. I will explain the problem more clearly, in the hope that some bright individual has the answer we are ...
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Bind timing out querying for A/HTTPS record with large delay from authoritative
I have a setup where:
client = x.y.36.152
recursive resolver + DoH server = x.y.36.153
authoritative DNS = x.y.36.150
TLS server = x.y.36.148
I’m running BIND9 as the recursive resolver on .153. I ...
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DNS: How to route Russian traffic directly (1.2.3.4) and others via Cloudflare (5.6.7.8)?
I need to configure DNS so that:
Users from Russia access example.com directly via IP 1.2.3.4 (no Cloudflare proxy).
Users from other countries go through Cloudflare on IP 5.6.7.8.
Can this be done ...
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Windows VPN client using OpenConnect does not resolve internal addresses
The internal corp.local DNS is not resolving and pinging via VPN on a Windows VPN client.
There is a host machine on the local network running a Docker container with a VPN (oscerv) server inside. ...
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Single reverse DNS zone for several forward BIND9
I have this bind9 settings:
named.conf:
include "/etc/bind/named.conf.options";
include "/etc/bind/named.conf.local";
named.conf.options:
include "/etc/bind/rndc.key";
...
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Issue resolving IP with DNS delegation and multiple sub-domains
My team has a sub-domain from our company delegated to a Route53 zone, so we can manage the DNS entries for our own applications we develop.
We have a setup where each application gets it's own AWS ...
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New architecture design to improve DNS resilience
How server usually handles multiple IP after DNS query reply ?
Round Robin: A common approach is for the client to cycle through the
IP addresses in the order they are received (round robin) for
...
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Changing host affects mail account, mail settings?
I have a domain that is configured to use the DNS servers of Cloudflare.
Here are the DNS settings:
Here are the Cloudflare settings:
I want to change the host from easyhost.com(hostway.com) to ...
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2
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Spamhaus Error: excess volume in Postfix. False positive. Stuck
I am having this weird Postfix issue with Spamhaus excess volume error. First off I checked what the error suggested to check here
I followed the instructions and changed my configuration as follows:
...
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Cloudflare second DNS request via TCP fails in the same connection
I'm encountering an issue when sending two consecutive DNS requests over the same TCP connection to Cloudflare's DNS server using dnspyre. The first request succeeds, but the second one consistently ...
- 101
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GCloud unstable DNS handing in VM using default metadata service
since some weeks we have noticed that DNS queries for google services like google cloud storage are failing with unknown host errors.
we observe this kind of errors in our own software stack as in the ...
