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Questions tagged [dns]

Domain Name System (DNS) is a service that provides the resolution of host names to IP addresses. Use the [tag:dns] tag when you are troubleshooting DNS issues, configuring a DNS resolver or server, or are trying to understand DNS's involvement in your situation.

263 questions with no upvoted or accepted answers
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Bind Security Warning

I always seem to find the following message in my Bind logs: security: warning: using built-in root key for view _default Could anybody advise please, what does that mean and how do I fix it? It's ...
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Bind Sync Unknown Command

Could anybody please, enlighten me on the following messages in my logs for Bind: sync 127.in-addr.arpa(unknown command): 2 Time(s) sync domain.com(unknown command): 2 Time(s) It's neither an error ...
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Ubuntu 18.04: unbound seems to stop working after a period of time

I set up pi-hole with unbound on my ubuntu 18.04 machine. I followed the instructions by pi-hole[1]. Clients can reach websites with this method but after some time I get timeouts. Pihole is still ...
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NordVPN (OpenVPN) DNS lookups fail

I followed instructions in this answer: ssh into a server which is connected to a VPN service so that I could connect/stay connected to remote Ubuntu 16.04 server via SSH while the server was ...
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Can reach local DNS, but remote not

I'm getting nowhere with the following problem: When using my local ISPs DNS server at 192.168.0.1 (for example putting it into /etc/resolv.conf or using it directly with dig google.com @192.168.0.1) ...
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How to clear DNS cache on Fedora on any other Linux distro

I've just changed the hosting for my Domain the name got propagated (24 hours passed) I have new page (without SSL because I didn't added it yet on new hosting) on my android phone. But when I open ...
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about cross domain between CDN Azure and FortiADC

I'm facing issue that when I create CDN in Azure to redirect to my server via IP (in Azure Environment). the domain CDN gave is example.azureedge.net. but the domain for my server is set via fortiadc ...
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Hostapd with DNS rerouting

I have an old Mac Mini running Debian Stretch where I have bridged the wifi interface to the ethernet interface like so (/etc/network/interfaces): source /etc/network/interfaces.d/* # The loopback &...
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Master DNS - Windows, Slave DNS - Linux

There is a working DNS server in Windows Server 2016. I installed and configured slave DNS server in Oracle Linux 7. In windows server, I enabled BIND secondaries, and to Listen all ip addresses. ...
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Two DNS for one IP address

There is a Windows Domain Server and DNS installed on it. There are users in LAN and domain name is example.local . Web server with IP address 192.168.10.124 is written in that Windows DNS server ...
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What Happens When the Hostname Differs from the One in the /etc/hosts File

It is possible to have the name from hostname not appear in the /etc/hosts file in *nix systems. What happens in this scenario?
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Multiple root.key files with Unbound installation on Ubuntu 18.04 LTS Desktop

The Unbound DNS resolver installation on Ubuntu 18.04 LTS Desktop (amd64) has at least two root.key files. One of them lives in /usr/share/dns/root.key, and the other at /var/lib/unbound/root.key. ...
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Is there a way to substitute domain names in DNS requests with dnsmasq?

I'm trying to change domains in all my outgoing DNS requests (before they are going out to DNS server) let's say from <foo>.<suffix1> to <foo>.<suffix2>. Is there a way to do ...
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overwrite DNS domain

We have an enum server that sends all naptr request to an enum provider. The provider only responds back if the domain matches them. We have several domains and I need to intercept the request ...
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Make bind dns to use external recursive dns when resolving fail

My country block some DNS servers. So main recursive DNS server for our institution fails to resolve some domains. Is it possible to use 8.8.8.8 as fallback on our DNS server in case when own ...
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powerdns forward naptr records

We have an enum provider and I would like to setup a powerDNS server that will look for the naptr records locally and if not found, it will forward them to the providers enum server.
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Issues with NFS/CIFS shares and martian packets when using two interfaces

Background: I have an isolated LAN. The switch is configured with 3 VLANs Here is how my network is setup VLAN Subnet Mask CIDR Range Gateway 10 192.168....
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node.js instance on Apache is not accessible from the Internet

I installed in my Linux Ubuntu Server virtual machine a Node.js web instance and started it on port 3001. I configured my host DNS to redirect the domain geekchic.com to the IP address of my Linux ...
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Configuring Stub Resolver in RHEL 8: systemd-resolved not caching DNS queries

In RHEL 8, systemctl list-unit-files|grep resolved reports that systemd-resolved is both present and running by default. However, systemd-resolve --statistics shows no name:ip mappings are being ...
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Postfix / SpamAssassin ignoring SPF entirely

I am currently getting a ton of email from "myself" and have been having a ton of difficulty filtering it. I have postfix configured to check SPF and (presumably) reject if it fails, and SpamAssassin ...
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What happens if the SOA returned by the nameserver has an MNAME that is non-authoritative for the domain?

Previously I asked "What if the nameservers stored at the registrar for a domain answer non-authorative?". Now I have another question along the same lines. I'm really trying to understand the ...
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184 views

DNS lookup fails on first time, but second lookup works

I have a lot of Raspberry Pi systems which are located at different networks of over which I have no control. Recently I recognized that at one network sometimes but not always the first DNS lookup ...
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38 views

Setting up multiple network interfaces using /etc/network/interfaces

I'm trying to setup my 4 network interfaces to have a specific dns-nameservers and dns-search so I can be connected to my domain using any of them but it's not working properly as when I run systemctl ...
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Can't resolve domain with Unbound (DNSSEC problem?)

I'm using a raspberry with pi-hole and unbound (1.6.0) to manage my DNS. Some days ago, I recognized that I have troubles with some domains but I didn't thought about DNS problems on my side. Today I ...
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184 views

Force run a dhclient script?

I'm seeking to prepend a local resolver into /etc/resolv.conf using a dhclient script at /etc/dhcp/dhclient.conf: prepend domain-name-servers 127.0.0.1; Is there a way for me to force dhclient to ...
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SSH-keys ipv4 ipv6 connection issue

Update: I found this question which seems to be very related. Not sure how exactly. What am I missing? I can only use ssh when it resolves through https hostnames? Normal ssh it hangs kinda like ...
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How to auto populate /etc/resolv.conf when using a static configuration

I'm on an IoT device running busybox with glibc. When I have a DHCP setup in /etc/network/interfaces then udhcpc atuomatically updates /etc/resolv.conf. I can see this by clearing /etc/resolv.conf and ...
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Unbound resolving to high ping servers

I have installed unbound on my Pi Hole to get DNS over TLS for my entire home network. I realized that my home network had gotten slower than before. At first, I thought it may be because of Unbound ...
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nmcli won't let me remove DNS entry from /etc/resolv.conf

Centos 7.5, nmcli version 1.20.2 Whenever I try to remove entries from /etc/resolv.conf I get the following errors. [root@client ~]# cat /etc/resolv.conf # Generated by NetworkManager search home ...
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AWS route53 domain not resolving to private ubuntu 16.04

I have the domain and sub-domain in AWS route 53. domain.com sub.domain.com the 'A' record of sub.domain.com added with the public ip of the instance. And an ubuntu 16.04 server privately hosted, ...
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Manage a VPN TUN connection under fedora 29 dhcp routing dns

SoftEther is a nice project to establish a VPN a bit easily using both windows and linux enviorment. It has also a vpn azure ddns. My enviorment is A network 192.168.1.0/24 with various host most ...
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Weird DNS problem with Ubuntu 18.04

I'm facing the following rather strange issue with my DIY NAS running Ubuntu 18.04. (I think that's when this happens...) When the system is restarted (say, after a power failure) it sometimes isn't ...
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How to install Postfix in an all default way (no setup wizard) and to be used with no email DNS records?

The following question is a follow up to this question. In a latest Debian 9 stable I desire to install Postfix to send email from my machine to my very own Gmail account by the quickest install ...
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350 views

resolv.conf always empty

I have 2 different embedded devices...an old one running TI arago Linux and a Xilinx device (petalinux). On both I see the same outcome when adding dns-nameservers to /etc/network/interfaces and ...
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resolv.conf dns-nameservers not working, but nameserver works

Hi all this is the content of my /etc/network/interface file on my uuntu 16.04 pc iface eth0 inet static address 192.168.0.2 netmask 255.255.255.0 gateway 192.168.0.1 dns-...
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Devuan RFS. How to automate resolution of internal IP (LAN) addresses

System correctly resolves external hostnames (bbc.co.uk for example) but will not resolve any internal (LAN) ones. The question here is how to automate LAN lookups without having to modify hosts and ...
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Why is BIND DNS zone transfer update not displaying on terminal screen but showing in logs as up to date?

I have configured a master/Slave zone, the zone transfer happens but does not display on the terminal screen, on the terminal screen it shows notifies ONLY, but when I check the /var/log/named the ...
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285 views

DNS Slave says failed to connect: host unreachable

I have a DNS Master (192.168.102.159) and Slave (192.168.102.132) servers, both are VMs, the Master configuration is fine and does both forward and reverse lookups, however, when I try zone transfers ...
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Cent OS VM not resolving DNS via nslookup ?! all zones/conf OK

I have virtual setup on NAT in VMWare with a Cent OS as a DNS Server (192.168.102.159), I ran the zone and conf test through bind named, allresults are OK, when I run nslookup from a client I get : ...
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using local dns to allow domain based transparent proxy

I am from iran and some websites are blocked for iranian ips (like nvidia and intel and so on). there is this website that advertise that I can access those domains buy just changing my dns to theirs. ...
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Exernal addresses not resolving

I recently changed ISPs. I got a new router. After a lot of messing about I have the router running almost the way I want it. However, since then my Raspberry Pi can't resolve external addresses. So, ...
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461 views

Bind - Configure different Forwarders only for Specific Domains CDNs (eg. Wetransfer, Cloudflare, Amazon AWS)

INTRO I've setup a linux box where there's a BIND that serves me as a local dns. Basically by taking advantage of RPZ I can restrict some hosts and at same time with DNSCRYPT I forward everything to ...
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89 views

Adminstering GoDady using CLI/API

Is there any tool CLI/API where one can automate the GoDady DNS related operations such as addind/removing DNS records and managing SSL certificates and domain names? without wasting time around on ...
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Debian 9 allows hidden DNS queries?

In previous Debian Jessie I could configure iptables to restrict DNS traffic to my own router (192.168.1.1): Chain OUTBOUND (1 references) target prot opt source destination ...
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Restricting systemd units to specific host based on DNS alias?

I know that it is possible to restrict systemd units to a specific host by using the ConditionHost condition in the unit file. This ConditionHost is tested against the result of calling hostname. ...
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1answer
143 views

How to locate the module that handles DNS resolving in buildroot?

I have 2 different Linux devices, one's kernel is done using ltib (L from now on), and the other's by buildroot (B from now on). I manage to add a DNS resolver to B by using: echo "nameserver 8.8....
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676 views

Any DNSBL script to Unbound?

I know a lot of DNSBL lists (someonewhocares.org, abuse.ch, malwaredomains.com, etc...). I wish to know if anyone knows of scripts that can gather these lists (at least some of them) and compile them ...
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51 views

Cannot bind a local domain name to my system

I have added a new zone to /etc/named.conf as follows: zone "mysite.local" IN { type master; file "mysite.local.zone"; allow-update { none; }; }; Also, the zone file is as follows: ;File ...
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145 views

Why is my DNS server not resolving from an external system?

server1 and server2 are guest VMs in a KVM host machine: server1.example.com[192.168.4.210] : Configured as DNS server tcpdump output while query is running from server2 server2.example.com[192....
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2answers
72 views

Configure a DNS-server for a domain

In Ubuntu I'm trying to configure a DNS-server for a domain. I haven't tested it yet because I haven't got access to the virtual box yet. But I can feel that it contains problems. Can someone spot any ...