Questions tagged [dns]

For questions pertaining to Domain Name System (DNS), a service that provides the resolution of host names to IP addresses. Use this 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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Headless debian: SSH from host machine using hostname

This is for personal use, I have a debian running on a VM. I would like to know if BIND9 is required to be able to SSH using the hostname from host machine or modifying the /etc/hosts and resolv.conf ...
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problem with DNS resolution in CLI

old MacBook screen is dying, so switched to a new Ubuntu 22 laptop immediately DNS problems, hitherto not experienced, ensued I'm working with a staging box (AWS), xsubdomain.xdomain.com. Web browsers ...
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systemd-resolved stub resolver is dropping connections, and not responding to queries. Why is this?

I'm having some issues getting DNS Over TLS configured natively using systemd's resolved. My steps to configure: modify my /etc/systemd/resolved.conf file (this can be seen below) restart resolved ...
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How to resolve DNS to VirtualBox server?

Ok so most of the knowledge I have about it is complete, but I am missing some steps. I created a dynamic DNS at no-ip.com, I don't know if I'll use that service ultimately, but there are a lot of ...
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Impossible to create an email address from the postfix admin

Good morning, I am doing a year-end project which consists in creating a postfix mail server, I arrived at the creation of emails except that when I want to create an impossble mail addendum I have ...
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How to configure proxychains the right way?

I configured proxychains following a couple tutorials on the web which were pretty much all the same, as they showed the configuration using Tor service. The problem I'm having is that my DNS is being ...
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Disable local sever systemd-resolv DNS resolution

I use semi-static DHCP-based IP address assignment for the server. I want to disable systemd-resolv caching on this server completely and use DNS server and search pattern from the DHCP and have it ...
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nmcli - delete / replace DNS [Ubuntu 22.04 LTS]

I have a problem with slow DNS queries while in VPN. Until the Problem is fixed, I want to delete / replace a specific DNS. What I've tried so far: Change DNS in "Connections - System Settings&...
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Unbound doens't look for A records in cache

I deployed the unbound caching server, below is how it is deployed Client ---> InternelDNSServer(Windows) ---> ExternalDNSServer(RHEL) ---> GoogleDNS from Localhost(unbound) If i do dig +...
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How to populate DNS suffixes on Nmap hostname scans in Kali

I need a Kali box on my network to be able to properly retrieve DNS suffixes from the DNS servers when using Nmap scans. When I run Nmap hostname scans from my own machine, I can watch the traffic in ...
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How are DNS queries are handled in RHEL linux distributions?

When I modify an ifcfg-.... configuration file for a newtork interface and add DNS1 & DNS2 entries, these DNS values are appended to /etc/resolv.conf by Network-Manager service when this service ...
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/etc/resolv.conf gets modified regularly [duplicate]

I'm running Ubuntu 20.04 on my home server (including Pi-hole with DHCP). Frequently, including but not just after reboots, DNS resolution on the system breaks entirely because /etc/resolv.conf is ...
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"Failed to get global data: No buffer space available" on running "systemd-resolve --status"

I'm on Mint 20.3 (based on Ubuntu 20.04) and I keep having this weird problem where my network is all working fine and then suddenly, apparently out of the blue, it stops working and I can't access ...
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What's required to let a domain send outbound emails from multiple domains?

Let's say I have: 40 outbound emails to send main domain - main_domain.com 4 separate domains-workers with Postfix - mail.my_postfix1.com...mail.my_postfix4.com Goal: send 10 emails via each of 4 ...
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Is there a streaming endpoint for DNS lookup / IP metadata?

I would like to know all changes of domain names / metadata linked to a given (wide) range of IPs. For now, I execute a batch of scripts that extract regularly the domain name / metadata behind each ...
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CentOS7 CloudFlare DNS

I'm trying to make my server use CloudFlare public DNS (1.1.1.1, 1.0.0.1). When I edit /etc/resolv.conf I see: ; generated by /usr/sbin/dhclient-script nameserver 10.10.10.10 When I update it to this,...
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Ubuntu 20.04 systemd-resolved should resolve to different dns servers based on search domain

I am using Ubuntu 20.04 and systemd-resolved to resolve dns queries. Machine is attached to 1 interface. network: ethernets: eth0: dhcp4: true set-name: eth0 nameservers: ...
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Unbound IP redirection

I'm trying to redirect my LAN queries i.e. 10.0.0.0/8 to my captive portal hosted at 10.10.10.10. I've 2 networks, 10.0.0.0/8 and 192.168.1.0/24. Objective is redirect 10.0.0.0/8 to 10.10.10.10 There'...
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Debian 11, the resolv.conf does not save nameserver settings permanently

Debian 11, I faced issue with internet connection not available, and pinging can't resolve domain names. The /etc/resolv.conf file is constantly overwritten by NetworkManager, and after reboot it ...
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Weblogic redirection error

I am currently facing a problem in Weblogic with respect to DNS. Scenario: The user accesses the portal by DNS "www.xxxx.com.br" and when he logs in he is redirected to the IP "10.18.x....
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Can't get DKIM Key

I am having an issue with not finding the public key of DKIM. I am using a local DNS (BIND), so there isn’t a problem with propagating. I just copypasted the output of given generated public key into ...
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Networkmanager is populating resolv.conf with incorrect information and I can't override

NetworkManager always sets my DNS server in /etc/resolv.conf to be 192.168.1.1 even though my router address is 192.168.18.1. Manually setting it to the latter works, but is overwritten constantly ...
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Why does systemd-resolvd fail to transparently query its upstream DNS resolver for short hostnames?

I use dnsmasq to provide DHCP service on my LAN. dnsmasq is also providing DNS service. When host foo acquires a an IP address via DHCP, dnsmasq will respond to DNS queries for the name foo by ...
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OpenBSD: stop resolvd from prepending nameservers to /etc/resolv.conf

After upgrade to 7.1 I notice that resolvd always adds a nameserver received via dhclient to /etc/resolv.conf $ cat /etc/resolv.conf ...
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mDNS on OpenBSD; resolving names in the ".local" domain using the standard resolver

I have a collection of macOS, Ubuntu Linux, and OpenBSD systems. They use mDNS to publish their dynamic IP addresses to the local network, making themselves available under the .local domain name. My ...
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Setting up DNS server with bind9 issue: creating TCP socket: address not available

I am trying to setup a dns server on ubuntu. With sudo systemctl status bind9 I get Apr 17 10:14:21 dns named[1002]: no longer listening on fe80::9903:2b67:b230:aaaa%3#53 Apr 17 10:14:21 dns named[...
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How to automatically update new hostnames inside local network?

I'm trying to make some simple decentralized DNS for my local network. The trouble is that every time I add a new machine, the other machines on the net can't find its name automatically because it ...
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1 vote
1 answer
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Samba AD DC DNS Directory Service error

Clients can log in, pull the cached gpos, only the stored credentials for mapped drives are lacking. With the RSAT tools, of course, no more connection. Im really confused at this point because this ...
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Strange MX problem / issue with subdomains

I am a bit confused with regards to MX and wildcard-A-entries in a dns zone. Imagine a zone foobar.com with these dns settings (NS set is there, leaving out) foobar.com IN A 1.2.3.4 *.foobar.com IN A ...
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resolvectl ignores new VPN network adapter

I have a strange problem when I connect to a company VPN with forticlient application. First, I did not know what was wrong. After spending some time, I figured out that DNS is not working as it ...
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Configure dnf to use DNS-over-HTTPS (DoH) without using systemd-resolved

Is there a way to configure dnf to use DNS-over-HTTPS (DoH) without using systemd-resolved or a proxy (i.e. dnscrypt-proxy)? I dont like have local servers running on desktops (even on loop back ...
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DNS Resolution over Network Interface

I am trying to route specific site DNS queries through specific network interface. I have private site which is accessible only through specific network interface enp39s0 (eth) and my default internet ...
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Pihole warning elaboration: "reducing DNS packet size for nameserver ADDRESS to SAFE_PKTSZ"

Could anyone elaborate a little on this warning? Reading the unbound comment it references, I guess it's some configuration in place for security reasons (?), but I'm not clear on what the tradeoffs ...
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No DNS resolve on intranet clients when internet modem has disconnected from internet

This is a very peculiar issue. I have a SOHO in my home that looks roughly like this: internet->-|ISPmodem|->-|Firewall/DHCP/DNS/HTTP server|->-intranet where ISP modem is not used as a ...
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Resolving/Routing network trafic through specific interface

Currently I have two network interfaces (eth, wifi). I am looking for solution to route all traffic *.myprivatedomain.com through eth while rest of the internet goes through wifi. I understand that ...
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`sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder` does not clear dns cache

I need to clear DNS cache on macos Big Sur as one of the servers in local network changed IP address. When I ping that server by name it shows old IP. sudo dscacheutil -flushcache; sudo killall -HUP ...
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DNS Zone File: Can a A-record also have individual TTL when there is already a default TTL at the top of the file?

The default TTL ($TTL) is set at the head of the zone file. Individual resource records do not have TTL. $TTL 86400 ;default TTL (1 day) @ IN SOA ns1.xx.xx.cc. admin.xx.xx.cc. ( 2022031800 ; serial ...
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1 vote
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How to avoid allowing ephemeral port range rule in nftables

I am using Ubuntu 20.04 OS with dnsjava client library to query DNS servers. I have nftables rule in this machine which block all traffic on ports except ephemeral port range 32768-61000 which will be ...
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Bind9 keeps crashing when forwarding is enabled

I have a debian small server setup with bind9 and dnscrypt both on the same machine. Bind9 runs on port 53, dnscrypt on 5000. The regular bind9 server performs some checks then forward the requests to ...
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1 vote
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mint mate 20.2 network stops working after restart since change

my system stopped working right, maybe last patch maybe i did something wrong. please look into it,and maybe somebody has a solution,what or how i can change it to get it working again the main isuse ...
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"Temporary failure in name resolution"/ DNS Error in Kali (VMWare) / Slow Kali Download

I was doing some pinging on Kali (on VMWare) and realised that I could only ping IP addresses. Pinging 8.8.8.8 WORKS BUT pinging google.com either takes too long or gives an error: "Temporary ...
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2 votes
2 answers
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How to configure resolv.conf

I recently run into an apparent DNS resolution issue which I documented here and this led me to investigate /etc/resolv.conf further. On my Linux Mint machine, this is a symlink that points to /run/...
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How to find a process by network domain it requests?

I noticed my Linux machine makes many DNS queries for a specific domain (subdomain) malicious.foo.bar How can I find out which application or process tries to resolve this domain? I also want to see ...
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OpenDNS setup help

Tried to setup Opendns, but this time it did not work (in my previous install, it worked just fine, unfortunately my pc crashed and had to re-install my OS), followed the setup guide, unfortunately ...
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1 vote
1 answer
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OpenVPN client not using VPN DNS server

I have set up an OpenVPN server, as well as a DNS server on the private network to resolve private DNS addresses. On the OpenVPN server, I have set the private DNS address in the client DNS config. I ...
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RDNSS support on Debian 11

As far as I tried, RDDNS isn't supported natively on Debian 11. I manually installed rdnssd and IPv6 DNS appeared in resolv.conf. Is RDDNS natively supported on Debian 11 (this means that I would have ...
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What is the purpose of running a local DNS proxy server like systemd-resolved?

I was reading about systemd-resolved and how it listens on 127.0.0.53 for DNS requests. What is the purpose of running this server and making queries to it when you could directly query a DNS server ...
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1 vote
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systemd-resolved: which DNS server is used when no domains are set?

I'm wondering what DNS servers systemd-resolved will use when no domains are set. Does it use the Global DNS server or use one of the Link DNS servers? For example, when there are no domains set: $ ...
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How can we enable DNS Resolver functionality same as in Windows in Ubuntu 20?

In Windows Operating System DNS resolver is used to resolve external Websites in which it points to Google or Cloudfare & store in DNS Cache. AD servers are connected to this DNS Resolver for ...
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How to configure a BIND 9 name server as a slave for a zone that exists in multiple views?

I have a Bind9 hidden primary configured with views, and I need a secondary to transfer all the views of the same zone. Example: On primary: view "dmz-view" { match-clients { server-...
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