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Questions tagged [internal-dns]

DNS that is visible within your corporate network and VPN, but which is not visible on the public Internet.

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How does DNS work across two separate networks using NAT?

Apologies for sounding naive in advance, I am a newbie in servers/networking and have a generic question around Load Balancers, DNS and NATting. We have an app deployed on our private data center. The DNS/endpoint points to our load balancer…
Koshur
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Different DNS records on offline local network with valid DNSSEC

This is pretty much DNS spoofing on local network including DNSSEC, but I believe it should be somehow possible since I'm the legitimate owner of the domain. I'm planning to provide a service during 1-2 day events. The service will be available to…
M. Volf
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Is there a DNS cache that can automatically re-resolve its cache around the TTL timeout?

This is for a server setup with a wobbly upstream DNS for company internal server names. Sometimes, when an entry has fallen from the cache due to TTL, and our system tries to resolve it, the upstream doesn’t answer; then our system sort of falls…
Henk Poley
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Dual DNS Issue - Internal & External

I'm in a fix here in offering a softphone solution for a company to allow users work from home. CURRENT SCENARIO: The company has an existing internal Windows DNS "ABCcompany.com" and externally they have another DNS "XYZcompany.com". The softphone…
Matty
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How do I flush the DNS cache for programs running on Ubuntu server 20

I have moved my LDAP server (ldap.intranet.local) from a VM on one machine (192.168.0.5) to a docker container on a new server (192.168.0.7). I have updated the DNS records. When I turn off the LDAP service on the VM, I can no longer log in and the…
AlastairG
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Implementing Reverse DNS in a Live Environment

I've been tasked with implementing reverse DNS internally in our Windows environment. What are some risks I should watch out for, and what is the best way to setup a test environment for changes like these? Should I just spin up a new domain…
PermanentBeginner
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Correct Bind DNS configuration for both internal and external network with Ubuntu Server 20.04

I'm working for an office in primary education and I'm setting up a local server with Ubuntu Server 20.04 for both internal and external use. All schools and offices belong to the national network '.sch.gr'. The network have assigned to our office…
sak69GR
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upstream timed out (110: Connection timed out) while proxying connection - Nginx/Raspberry Pi/Ubuntu 20.04

I cannot find any help with UDP, so I have come here to ask. I have a DNS cluster set up on Raspberry Pis running Ubuntu 20.04 and Nginx. The proxy is used for UDP on port 53. I am needing to put this into production, however, I'm weary because I…
DevOpsSauce
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Local mail exchange with DNS servers

I have a problem with correctly setting up a working infrastructure for testing mail spoof preventing mechanisms. As stated in a graph below, I have 2 mail servers (centos1 & 2) and 2 DNS servers. It is obligatory to have one DNS per host to test…
MArhEV
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2 VPN connections, But DNS of the second one is not reachable

I have to use 2 VPNs to be able to connect the Network of my Work. If i use the OpenVPN (my work vpn) i can resolve the DNS normaly. If i connect another vpn before i connect the OpenVPN, i can reach the servers of my work just over IP Adresses. I'm…
El-Salatinie
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Bind9 DNS configuration for a private sub-domain from a public domain name

We currently have a private DNS service that we wish to migrate to Bind9. So I have to migrate the current configuration to Bind9, but I'm having trouble setting it up. Here is the context. I have a public domain name "acme.com" managed by a…
Waldo
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Several redundant automatic entries for all DHCP client machine host names in Samba 4 AD DC DNS

We have a Samba 4 AD DC installation wich is also the DNS in our network. It collects entries of all DHCP client machines with their addresses automatically. I can remember to have activated this behavior some day in the past, but can't remember…
andreas
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How to deal with rDNS when my DNS is hosted by a third party that doesn't support PTR records?

I have NameCheap DNS for my DNS hosting and a fully unmanaged VPS server that it points to for all my domains. I'm going through and making sure everything is right and optimized, but my reverse DNS shows server.myhost.tld for some reason (I was…
MJHd
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How to run Kubernetes without external DNS - Hostname could not be reached

I am installing a k8s cluster on CentOS 8 Hyper-V virtual machines. I used my router DHCP server to give them static IP addresses, but I have no DNS. When I was ready to setup kubernetes I ran sudo kubeadm init I received the following…
Robert
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Allow resolution from all internal name services with (outside) recursion disabled

Our DNS infrastructure is split into several name servers, central (Bind) and auxiliary ones (like AD). Disabling recursion effectively disables delegation and forwarding (in Bind at least). What are the options? Become a slave for AD…
Marki
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