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.

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If I have an L4 switch, is there an advantage to building my own dns server? [on hold]

Include your own dns server in the L4 switch configuration for the internal network, or Is there any advantage in building external network outside L4 switch configuration? And Real companies use ...
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Bonjour/Zeroconf not working properly on Ubuntu 18.04

I have a raspberry pi (Raspian) running a nodejs http page. The pi has a hostname and uses Avahi to advertise it. I have the Bonjour service running on my Windows PC and I can access the page just ...
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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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1answer
30 views

hostname failing to resolve in CentOS 7

I have a DNS server configured but the hostname is failing to resolve. I keep getting these error when running host: [root@ns1 ~]# host hostname Host hostname not found: 5(REFUSED) And I also get ...
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Are dnsmasq options “server=/localnet/192.168.0.1” and “local=/localnet/” are only used with “no-resolv” and “no-poll”

I am a bit confused while reading documentation. As far as I understand, if I do not want dnsmasq to read from /etc/resolv.conf and use as upper level nameserver 192.168.0.1 I create config like this:...
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Why wired connection(Shared) blocks the internet from other Connections, Debian?

I'm trying to share my wifi connection through ethernet in ubuntu and debian, but my script only work in ubuntu, when i use it in debian, the wired network works fine, but the wifi internet gets ...
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DNS Lookup on server with multiple IPs

I have a single CentOS server (amanda01) with three IP addresses on three different subnets. eth0 = 10.0.2.0 subnet eth0.vlan101 = 10.101.0.0 subnet eth0.vlan107 = 10.107.0.0 subet (As you ...
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37 views

strace does not list /etc/hosts in ping/host command in CentOS 7

I was reading https://zwischenzugs.com/2018/06/08/anatomy-of-a-linux-dns-lookup-part-i/ and on the author's Debian/Ubuntu system /etc/hosts is used. But when I do strace under CentOS 7, I don't see ...
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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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DNS over TCP (uclibc) [closed]

DNS queries consist of a single UDP request from the client followed by a single UDP reply from the server. The Transmission Control Protocol (TCP) is used when the response data size exceeds 512 ...
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Required key not available when running nslookup, dig

I upgraded my system recently, and now I am seeing a really bizarre error, any ideas on what I can do to fix this issue?: nslookup 8.8.8.8 ../../../../lib/isc/unix/socket.c:2135: internal_send: 192....
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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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No Route To Host from one VM on LAN

I'm quite stumped/frusterated as I can't get postfix to work on one of my VM's. It is a "template" VM and I have setup other VM's with this template fine. The only difference I can really think of is ...
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ping always suceeds - even on non-existing domains

Working on CentOS7 - after entering non-existing domain: # ping dfgsdfgsdfsdf.sd The answer is (mail.xsistema.lt is local domain, machine name): PING dfgsdfgsdfsdf.sd.xsistema.lt (192.168.0.55) 56(...
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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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dnsdomainname and hostname -f does not return FQDN

I have one box (Rasberry Pi, running rasberian) with a static IP. It's running in a network with a domainname, and I have several DNS-server set up. However, I can not get FQDN name to work on this ...
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Adding additional nameservers with resolvconf, dnsmasq & networkmanager

I'm running resolvconf, dnsmasq and interfaces&connections are managed by NetworkManager (nm). dnsmasq is supposed to cache dns entries, and use upstream servers configured via DHCP and manually. ...
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21 views

How can I configure some kind of DNS for OpenVPN network?

I have OpenVPN server on VPS server and few connected clients (notebooks, print/file server at home etc.). I would like to connect from client to client or from client to server by using names (...
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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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Bug in Virtualmin (/var/lib/bind/mydomain.com.hosts) causes 'unknown RR type' - prevents Zone loading and DNS propagation [closed]

I had a strange situation the last few days where I was pointing the DNS records from my registrar to my own DNS server and DNS was not propagating. I have done this before successfully and was under ...
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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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What overwrites /etc/resolv.conf roughly every hour?

I'm trying to add a search line to /etc/resolv.conf I've added it directly, as an append command in /etc/dhcp/dhclient.conf and as a nameservers block in /etc/netplan/50-cloud-init.yaml. After ...
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49 views

How do I generate TLSA records?

I need to setup TLSA records in the DNS for my host. I want to use it for HTTPS, e-mail and SSH. What are TLSA records? What does TLSA records look like? How do I create TLSA records?
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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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1answer
80 views

DNS issues on a single Wifi - Linux Mint 19.1

I'm having DNS problems with one WiFi network which I've been using for a long time. I tried to do an hotspot with my phone and everything worked as normal, so the issue is only on that network. ping ...
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1answer
47 views

Can an NTP client dynamically detect when to try connecting to servers, without integrating with the specific network configuration system?

ntpd handles dynamic network configurations just fine, as does timesyncd; ntpdate never handled dynamic network configurations, and I don't think it makes sense to work around that with scripts ...
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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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1answer
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DNS problem: no A record

Ten days ago, i installed a debian 9 stretch, at Kimsufi by OVH. i receive an email from support wich contains a problem with A record, my server is ns.xzave.net, and there is no record A on my server ...
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Bind DNS Server

enter code hereI am setting up my primary DNS server. The reverse lookup appears to work fine, it is the forward lookups that seems to be the problem. Here are my configurations files. /etc/default/...
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Bind9 shared libraries: libbind vs libdns?

There are two packages libbind and libdns packaged by Debian, they're both described as, The Berkeley Internet Name Domain (BIND) implements an Internet domain name server. BIND is the most ...
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1answer
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I am not able to receive emails on my VPS [closed]

I am using linux (Debian 8) on my VPS server. I use virtualmin to handle all domains. I created emails using 'create new user' in the 'edit users' section. I can send emails to others, but I am not ...
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1answer
119 views

iptables redirect dns to proxy

Can we redirect DNS (tcp/udp) requests to Squid proxy in non-transparent mode (3128) using iptables? (Would the squid proxy understand this and process it?) example rule to redirect tcp 53 (It could ...
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48 views

Why does dig utility hang indefinitely even with timeout specified?

I'm using dig utility to find public IP address. The command I used is: dig +short myip.opendns.com @resolver1.opendns.com but I had problem since on some other computers it took so long, so I ...
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36 views

BIND subnet syntax

I am trying to add an entire subnet to BIND, rather than individual IP addresses. For example instead of doing this: example1.test.com IN A 192.168.5.43 example2.test.com IN A ...
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33 views

reverse dns flow

I am trying to understand the reverse dns implementation of bind. in my lab setup, i have a pxe server witn dns configured. it has 21.168.192.in-arpa.arpa reverse lookup zone file. i am using foreman ...
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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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1answer
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Is it ok to combine machines with DNS server management and machines that do host lookups through a hosts file?

We have a cluster of Linux machines. DNS of these machines is managed by a DNS server (a Windows machine with DNS records). Now we want to add an additional cluster with Linux machines that would do ...
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/etc/resolv.conf overwritten with old DNS entries not what is in /etc/sysconfig/network-scripts/ifcfg-enp0s3

I have an Oracle Linux 7.5 VM on VirtualBox setup with a static IP address. My DNS servers have changed since I first setup the VM. I modified the file /etc/sysconfig/network-scripts/ifcfg-enp0s3 to ...
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2answers
71 views

resolv.conf with DHCP and local DNS server

I have installed a local DNS server (coredns) onto my machine and activate it by setting name_servers=127.0.0.1 within resolvconf.conf. Now I switch networks and want to have the DHCP provided ...
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1answer
34 views

DNS mx record for subdomain

There is a domain: example.gov.en And its subdomain: subdomain.example.gov.en When I send mail to user1@example.gov.en - it is ok, works. But when I send mail to user2@subdomain.example.gov.en - it ...
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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 ...