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.

260 questions with no upvoted or accepted answers
Filter by
Sorted by
Tagged with
2
votes
0answers
608 views

DNS suddenly stops working for a particular network on a particular machine, DNS_PROBE_FINISHED_BAD_CONFIG

I'm staying somewhere for a while where there are two wifi networks. One's mediocre, one sucks. The mediocre one worked fine on my HP machine with a Realtek card running Mint for several days. ...
2
votes
1answer
1k views

PowerDNS not resolving host computer

I just finished setting up PowerDNS to avoid having to remember all my IP addresses and it seems to work pretty fine, most host names resolve just fine but not the one running PowerDNS (named musicbox,...
2
votes
0answers
55 views

Assign Special Records for specific remote clients DNSmasq

I'd like to make DNSmasq serve special records for specific remote clients (Clients from the public internet) So for example if remote host 111.111.111.111 requests www.example.com it returns 3.3.3.3 ...
2
votes
1answer
139 views

Can't acces DNS

I'm running CentOS as a Virtual Machine. I can access the VM's server (IP = 192.168.0.107, which displays a phpinfo() page as it should), but now I would like to acces a custom domain name: "imd.be" ...
2
votes
0answers
542 views

DNS works half of the time in Oracle VirtualBox and I can't even maintain /etc/hosts file

I have installed three Linuxes on same laptop and same VirtualBox and this is my success ratio with DNS: HortonWorks & CentOS. Worked for 5 minutes and never after that again. VM image ...
2
votes
1answer
213 views

How to add another domain (SOA) to my bind9 installation when domain has not been delegated yet. What are the delegation steps?

I have a bind9 installation on my Debian Wheezy install. On this install I have a DNS-server which acts as the SOA for a domain, example1.com. My name server is also on the same domain, example1.com (...
2
votes
0answers
838 views

Postfix/devcot MailServer - not receiving emails

I'm new to linux and unix in general, I've worked with a shared hosting provider over the years where everything was setup for me, including email. I'm now trying to create my own mail server in my ...
2
votes
2answers
4k views

zone delegation in Bind

I have a lot of zones defined in my DNS server. I need to delegate one particular zone to a foreign DNS server and I don't have access to my domain-registrar control panel, currently. Is there a way ...
2
votes
0answers
1k views

How can I use an ACL in BIND to forward requests per zone selectively?

I have some zones declared internally as forwards to another DNS, but there is a hefty amount of IP space we do not want to be forwarded in this manner for these zones. These forwards are for very ...
2
votes
0answers
1k views

How to configure Unbound to use DNSSEC?

I'm having a local caching DNS server: Unbound: [root@localhost /etc/unbound] cat unbound.conf server: interface: 127.0.0.1 access-control: 127.0.0.1 allow verbosity: 1 harden-...
2
votes
1answer
37k views

Why am I getting “Curl (6) Could not resolve host” after I did a “yum -y update”?

I have a CentOS 7.3 machine that is a guest running on Oracle VirtualBox. The host is a Windows machine. I can ping 8.8.8.8 from the Linux server. The Linux server can ping itself by its hostname ...
1
vote
0answers
31 views

Resolving names with VPN and Local DNS without leakage

I have a network where we have mostly stock Ubuntu 18 installs and a local only DNS service for stuff on the network. What I want is for systems to get their nameservers normally with DHCP when ...
1
vote
0answers
22 views

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 ...
1
vote
0answers
24 views

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 ...
1
vote
0answers
82 views

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. ...
1
vote
1answer
39 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 ...
1
vote
0answers
86 views

Fedora 29 VirtualBox will not use DNS from host VPN

I am running a Windows 10 machine for work (required) and so use VirtualBox to get a Fedora 29 machine so I can run code locally before pushing to production. Our github is behind a VPN and we use ...
1
vote
2answers
4k views

How to solve a temporary failure in name resolution error?

I've installed Kubuntu 18.04 on a desktop with an ethernet connection. During the installation, updates were downloaded and the internet was working fine. Once the operating system is installed, every ...
1
vote
0answers
136 views

dnsmasq dns nameserver priority parameters - strict-order

I have a setup specifying two DNS namservers. One in local, the other is external. The local one is a pihole, which itself forwards requests externally after url filtering. The external one is set ...
1
vote
0answers
182 views

request.getRemoteHost() returns IP address instead of FQDN

I am designing a servlet in which I would like to determine the fully qualified domain name (FQDN) of the client. I am attempting to use javax.servlet.HttpServletRequest.getRemoteHost() in order to ...
1
vote
0answers
172 views

qemu guest is bypassing host's firewall

I've got a Ubuntu host running several virtual machines using qemu-kvm. Every guest should use our local DNS server, so I blocked outgoing DNS requests using ufw on the host machine: sudo ufw deny ...
1
vote
0answers
182 views

Help understand output of dnsmasq logs and find performance issues by reading dnsmasq log

I have dnsmasq installed on server and it is heavily used. I have the following dnsmasq log in the /var/log/syslog when given the signal "SIGUSR1": Jul 16 13:45:50 server1 dnsmasq[427008]: time ...
1
vote
0answers
457 views

Using a nameserver provided by KVM host

My bridge device is set up on the 192.168.1.0/24 network, and my KVM devices are set up on a virtual network (NAT to br0) in the 192.168.100.0/24 network. I have a MAAS server in KVM at 192.168.100.10 ...
1
vote
0answers
443 views

Can't use the resolution by name with kube-dns

I'm on a kubernetes cluster with 3 nodes that are all VM and they use to communicate a bridge that is an Only-Host interface: 192.168.99.101 master 192.168.99.102 and .103 the other nodes I have used ...
1
vote
0answers
91 views

Repeated DNS query on Ubuntu

On my router, for my home network, in the DHCP server settings, I specified the primary and secondary DNS servers as 8.8.8.8, 8.8.4.4. I have Ubuntu 16.04.4 LTS installed on my home server. For ...
1
vote
0answers
40 views

Resolve a hostname and know where the answer came from?

As part of auditing a RANCID server, I would like to be able to figure out whether it's resolving a particular hostname via /etc/hosts, DNS or some other source. Is there a generic (without me ...
1
vote
1answer
386 views

How do I configure my DNS / DHCP / gateway server with 2 NICs to use its own DNS?

My SOHO lan is served by my main machine which operates as a router, firewall, gateway, DNS, DHCP server and backup server. I've set up bind9 and isc-dhcp-server to do DDNS for the lan clients, while ...
1
vote
0answers
1k views

can I manually assign DNS server name with wpa_supplicant?

I am trying to run a Raspberrypi as a routing machine. It will be connected to wifi with wpa_supplicant. My PC ----> Raspberry Pi ----> Wifi Router The thing is I noticed, the RPi got from the wifi ...
1
vote
1answer
545 views

Which configuration file has higher priority for DNS server settings?

For Debian, DNS nameservers can be set both in /etc/network/interfaces and in /etc/resolv.conf. Which file has higher priority for DNS server configuration?
1
vote
0answers
107 views

DNS query to all available nameservers

I have managed to populate my /etc/resolv.conf with several nameservers when I bring up my VPN. The nameservers have two zones of operation, internal (through the VPN) and public (Exposed). Some of ...
1
vote
0answers
354 views

Samba4 Bind9 dynamic DNS Update Error GSS failure

I try to register my DHCP Clients to my Samba 4 based domain controller (DC). For this I followed the guide Configure DHCP to update DNS records with BIND9. I've searched around the internet without ...
1
vote
1answer
909 views

cannot ping website but can ping ip, DNS not working

I am using an ARM target running Open Embedded Linux from Yocto, it has eth0 network interface from a private LAN network. I am able to ping an IP like 173.203.44.122 but using the name(rackspace....
1
vote
1answer
341 views

How do I stop /etc/resolv.conf being repeatedly reset to point to 192.168.33.2?

On a windows host, I have two virtual guests on vmware workstation14. I have configured two adapters ens33 and ens37 for those guests, NAT and host only respectively. The vnet adapter for NAT on the ...
1
vote
0answers
2k views

Unbound with forward zones

In my network, I have a Unbound instance which works well for the global DNS. But all local requests are to be forwarded to another server (Dnsmasq) which holds the reverse and local addresses. It ...
1
vote
1answer
3k views

Web interface for BIND DNS and DHCPD servers

Currently we are using the BIND DNS and the standard DHCP server that comes with Linux (Scientific 6.4) as networking services on a private networking. Is there any some kind of a web interface that ...
1
vote
0answers
604 views

Openwrt Force DNS

I am working with some content filtering using openDNS. I am trying to get openwrt to redirect traffic for certain clients, based on MAC addresses, to openDNS servers. Here is my setup: openwrt ...
1
vote
0answers
123 views

How do I view the DDNS leases from BIND9 and DHCP server?

How do I view the DDNS leases from BIND9 and DHCP server? I have set up isc-dhcp-server updating leases with a fixed IP address from /etc/dhcp/dhcpd.conf to BIND9 zone and reverse zone. This command ...
1
vote
0answers
708 views

Unbound forwards local requests the wrong way

Good dag. In my network, I have two dns cache/resolvers: Dnsmasq on the router. Unbound on another server. Dnsmasq runs perfect. It provides local dns from the dhcp and the hosts file. Unbound is ...
1
vote
0answers
139 views

Problem in receiving answers from bind DNS server

As a part of an experiment I'm running 3 Ubuntu machines in the Create environment. Call them client, server and attacker. Client connected to server. (10.1.1.2 and 10.1.1.3, respectively) Server ...
1
vote
0answers
186 views

Are these BIND update forwarding errors safe to ignore?

I recently replaced my CentOS 5 authoritative BIND servers with CentOS 7. Everything is working fine, but my logs show some weirdness. I use a hidden master and my primary and secondary name servers ...
1
vote
0answers
227 views

Accessing external DNS from linux/debian server

I'm having trouble getting a curl response from an external server. I am working on a debian server I did not set up and the external resource (www.example.com) has be configured to not receive ping ...
1
vote
0answers
58 views

Jail outgoing DNS queries to single group with iptables does not work

I am trying to block all DNS queries from my machine by default, and only allow them for specific group of users. I try these rules: sudo su groupadd dns-allowed iptables -A OUTPUT -p udp --dport 53 -...
1
vote
0answers
466 views

Bind9 not forwarding DNS

I want to use bind9 to redirect a subdomain.domain.com to my ip or server, I tried doing this in named.conf zone "subdomain.domain.com" { type forward; forward only; forwarders { 192.168....
1
vote
1answer
506 views

Associate Google domain name to Python Flask website hosted at home

I have a Python Flask website which runs on my home system and is accessible to the Internet by home ISP IP address assigned to me and x port number. I have taken care of port forwarding from router, ...
1
vote
0answers
121 views

LAN Machine name resolution with zero configuration from linux to windows

I'm developing a software which will run in a Local LAN on linux machine, and this linux machine will use a shared folder from windows. I want the linux machine to be able to use the computer name (...
1
vote
1answer
442 views

Where is dhclient.conf in Fedora 22

Before you mark it as a duplicated please listen to the problem. I took a lot of time searching on this issue and found very similar problems but none of them solved it because the suppose solution ...
1
vote
1answer
484 views

Nslookup doesn't show full info on CentOS 7 docker image

I'm using https://hub.docker.com/_/centos/ CentOS 7 docker image. I created service with 3 replicas inside cluster and i'd like to query internal docker dns. For BusyBox image nslookup works exactly ...
1
vote
0answers
43 views

DNS Issue - Trying to make a LiFi Router

I am trying to make a VLC/LiFi router using 2 beaglebones and additional circuitry. They are running on Debian based Linux. One is to act as the router for the other. The router has an Ethernet cable ...
1
vote
2answers
593 views

Control source IP of local DNS queries to local server?

I have a local DNS server running on my Linux router. I have it configured to only allow requests from my LAN (192.168.1.0/24). I also want the server to be able to query itself for DNS. To that end I ...
1
vote
0answers
90 views

Can I make a subdomain unresolvable despite presence of “search” in resolv.conf?

I'm trying to find a workaround for the known issue in Github Enterprise: We incorrectly redirect to the dashboard if you accessed GitHub Enterprise using an alias while in private mode. This ...