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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.

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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
26 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 ...
3
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1answer
39 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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16 views

DNS resolution issue [closed]

I do have a domain named xxxx.co which runs on separate server acts as the main domain which is restricted from external access and there is a subdomain named dev.xxxx.co which is main domain runs on ...
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19 views

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
18 views

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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1answer
32 views

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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2answers
36 views

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
34 views

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
56 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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1answer
29 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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1answer
28 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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1answer
29 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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1answer
74 views

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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17 views

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
24 views

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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0answers
53 views

/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
31 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
29 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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0answers
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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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1answer
27 views

What if the nameservers stored at the registrar for a domain answer non-authorative?

In what way are resolvers concerned or affected by having a non-authorative response from the primary and all available secondary nameservers? Would a setup like this where the primary master ...
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1answer
230 views

ping: google.com: Name or service not known

I am on Arch Linux for Raspberry pi. Suddenly: I am unable to ping to a website. I am unable to access a website from the browser. I have two more computers (all running Arch Linux) connected to the ...
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1answer
33 views

is there any advantage to use dns server instead of dns that based on /etc/hosts

we have two option to use DNS in our presto cluster use /etc/hosts and set all aliases in hosts files use DNS server ( WIN 2008 server ) , and configure /etc/resolve.conf the first option is more ...
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1answer
24 views

What does a resolver do if DNSSEC is properly configured on a server that isn't reporting to be authoritative

Does DNSSEC require that my NS1 and NS2 stored at the registrar be authoritative, or just that they answer for the domain? Can they be non-authoritative DNS servers answer the query? Does anything ...
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1answer
65 views

DNS: a “short” query (UDP) does not return an address, but a “long” (ANY, TCP) query does

This is a companion to an AskUbuntu question I posted before I had learned enough to ask this question. (This is for Ubuntu 18.04) By watching the debug output from systemd-resolved, I can do ...
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2answers
54 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 ...
2
votes
1answer
89 views

How do I to debug a slow network? (ArchBang)

Situation: MacBook Pro (late 2011/i3) with ArchBang has inconsistent network issues (very slow speed, pages fail to load, dns resolution failing). The workaround: systemctl restart NetworkManager....
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1answer
134 views

Update Failed: Download failed. cURL error 6: Could not resolve host:

I am getting the error "Update Failed: Download failed. cURL error 6: Could not resolve host:"  on WordPress on my vps server...I have also noticed it in other applications as well. As a consequence, ...
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32 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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1answer
108 views

How to disable network-connectivity-check on linux mint?

(Virtualbox OS: Linux Mint 19.1 Tessa) I am trying to disable the network-connectivity-check on Linux Mint. This website shows how to disable it in the GUI for Ubuntu 17.10. Unfortunately in Mint ...
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40 views

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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1answer
47 views

DNS + DHCP in home lab [closed]

Setting up a home lab. I was originally planning on using static ips for everything and then powerdns + poweradmin for DNS. Recently though it dawned on me that it would be a lot simpler to just use ...
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0answers
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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 ...
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1answer
30 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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2answers
62 views

How can I set a custom DNS server within Nixos?

I've not found much information in the manual. I've tried to manually modify the file /etc/resolv.conf however this seems to be overwritten by something? How can I achieve this?
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1answer
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Should I configure the DNS2 to an other company's DNS address?

When I configure the interface's DNS, we often configure 8.8.8.8 and 8.8.4.4, but I have a question, because the 8.8.8.8 and 8.8.4.4 all are belong to google. will the bellow be better than the ...
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1answer
156 views

Redirect all outgoing DNS queries to local stub resolver at 127.0.0.1:53

I am attempting to redirect all outgoing DNS queries on my Linux box to my local caching stub resolver (unbound). iptables -t nat -A OUTPUT -p tcp --dport 53 -j DNAT --to 1.1.1.1:53 iptables -t nat -...
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1answer
114 views

Make separate mail server from web server [closed]

We have one physical server: there are www (web site) and mail on it. Server has 2 public ip addresses, one for www and one for mail. Server also has DNS on it, O/S is Red Hat Linux. We want to ...
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0answers
30 views

Can I alter the result of DNS resolution for a VPS?

I have a VPS hosted by a no frills provider and have an IP that I log into through SHH. When I run a traceroute on it, the final hop identifies the location service as ip-somebrand.com. As my ipv4 ...
3
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1answer
77 views

How do I force dnsmasq to use a specific DNS server without affecting the host systems DNS settings?

How do I set dnsmasq to use one specific DNS server without changing which DNS server the host system uses for its own DNS requests? I should clarify I am not using dnsmasq as a DHCP server but only ...
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0answers
107 views

ntp using ipv6 address instead of ipv4

I have a laptop running a version of Linux ( 3.12 ). I have ntpd installed and configured to sync with time.google.com. The problem I am having is if I am plugged into a network that only provides ...
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0answers
101 views

What is the recommended way to set a global DNS server override on a system using systemd-resolved?

I would like my newer GNU/Linux system (Ubuntu 18.04 LTS) to use a single, manually-configured, DNS server for all DNS queries. In the past, I could simply do echo "nameserver 1.1.1.1" | sudo tee /etc/...
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2answers
70 views

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 ...
2
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1answer
35 views

Forward DNS requests for a zone except one record?

I've got a domain name and hosting web content with a provider, so have for example server.example.com hosted in the cloud. The provider also manage my DNS. Now I would like to run nextcloud on my ...
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0answers
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How do I configure my system, to use a specified DNS server, for all connections? [closed]

I want to use a set of custom DNS addresses, for all connection, without resorting to change configuration for each connection individually. In the Network Manager I can change the preferred DNS ...
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0answers
22 views

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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1answer
105 views

Redhat repos not found

I have a Redhat 7 system on loan from a customer in order to install a 32-bit application. To get the application to work, I need to install the gtk2.i686 toolkit. By doing this command: yum list --...
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1answer
623 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 ...
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1answer
109 views

Can you assign different DNS servers to different network interfaces?

I am trying to have my eth1 use 10.50.1.11 and 10.50.1.12 dns servers whilst my eth0 interface uses 8.8.8.8 and 8.8.4.4 dns servers. I am running centos 7 vms within xenserver 6.5. eth1 is a closed-...