I have configured a virtual network and have a DNS server (by doing DCPromo on a VM). Somewhere I read that this DNS server being "first" in the network will get a IP address of x.x.x.4, So I assumed that, spinned three more machines and then joined them to the domain. When doing the joining, I choose in the network adapter setting 10.0.0.4 as the DNS server but left the IP addresses empty so that DHCP can assign them.
When I reboot my DNS server, I see that the machines I assigned to the domain have all lost their DNS address (resolves some arbitrary 169 series) and I forced to re-enter the domain DNS server again.
Am I not supposed to rebooting DNS in Azure?
If I do have to reboot (say windows update), does that mean that I have to reconfigure ALL the machines to the DNS server addresses AGAIN?
Cheers
VJ
Related
I am joining Linux and Windows instances to an AD domain (). The machines are joining fine to the domain and I can use ssh/RDP using the AD credentials to login to the machines post domain join.
I can also get all the computer objects (host names) by running Get-ADComputer -Filter * on a windows server and providing the domain credentials. The issue is that, the host names for Linux based computers are not resolving to an IP address. Whereas all Windows hosts are resolving fine.
nslookup <windows-host> is returning host's FQDN and the IP address.
nslookup <linux-host> is returning Non-existent domain.
P.S: All these resources (windows and Linux hosts) are in the same network, using same DHCP/DNS server and can communicate to each other with no issues. Also I can resolve and connect to the AD domain from all these hosts
Any idea why this could be happening and how to resolve this ?
My use case is to get the IPs of all the computer objects in my AD domain.
Normally when using DHCP Windows will attempt to register its own A and possibly PTR records in the configured DNS, not sure about Linux. You may configure your DHCP server to update DNS for the clients (instead of leaving it to the clients themselves), i.e.:
To configure a DHCP server to register and to update client information with its configured DNS servers, follow these steps:
Open the DHCP properties for the server
Click DNS, click Properties, click to select the Enable DNS dynamic updates according to the settings below check box, and then click Always dynamically update DNS A and PTR records.
Source: https://learn.microsoft.com/en-us/troubleshoot/windows-server/networking/configure-dns-dynamic-updates-windows-server-2003
in a GCP Redhat VM, I added one of our on-premises DNS host to /etc/resolv.conf. I added the DNS IP after 169.254.169.254.
When I try nslookup/ping a host that belongs to on-premises DNS, it does not resolve the hostname. Wireshark shows that it does not lookup beyond 169.254.169.254.
When I switch the IPs in /etc/resolv.conf and put my IP first, then the host on prem works, but GCP VM host name don't. In this case, 169.254.169.254 is used, but none of the domains in the search list is used.
my understanding is that every DNS ip will be used to resolve the hostname, also every domain in the search list will be used in the process. but this does not seem to be the case here.
I make a web site to my local. I set bindings local.com and www.local.com. I add hosts xml to
127.0.0.1 local.com
127.0.0.1 www.local.com
So, I can connet on my pc like
local.com,
www.local.com,
192.168.1.35
But another pc on my network can't conenct with friendly name
www.local.com,
local.com,
But same pc can connet with ip
192.168.1.35
How can that another pc connect with friendly name ?
IP Addresses are the numerical identification for each device on a computer network.
Named Addresses invented, because remembering each device Address's turned to a difficult job.
So someone must know's which names must be converted to which IP Address.
DNS Servers are responsible to do this translation. But you done that locally. Actually you don't have a DNS Server on your local System, So you can't tell to others that "WWW.Something.COM" is my Address.
If you didn't connected to the internet, you must establish a DNS Server or done this task manually in all clients:
https://helpdeskgeek.com/networking/edit-hosts-file/
Running a DNS Server is another task. you can search for DNS Server applications like https://simpledns.com/ or you can setup a DNS Server using Windows Server. for both scenarios you need to tell to your clients to add your DNS Server Address to their network Adapter settings.
or If you are connected to the Internet, you can Use a NoIP to register a free Address:
https://www.noip.com/
you then need to download an application (In Noip.com) to monitor IP changes, it will monitors your IP address and it changes and then tells to NOIP.com to translate your address into your current IP address.
Actually NOIP will registers your address globally around the Internet network and each one who can access to the internet is able to reach to your address.
We build a set of virtual appliances used throughout the company. The networking on the VM is set to NAT to prevent external DNS records from being created, unfortunately at least once a month someone switches it to bridged so other people can connect.
The problem with this is they all have the same hostname, as soon as the external DNS record is created everyone is routed to this new address causing issues until we track down the culprit and change it back to NAT or change the hostname.
Is there a method in a 2008 R2 AD environment to blacklist a hostname and prevent a DNS record from being created? DNS is configured so a record can be created by anyone with a network device which makes it messy. Adding an A record pointing to 127.0.0.1 won't work as people work with the VM from outside it with a client.
This is a multi-domain environment and the root domain has DNS restricted, if there's a way to force the VM to request a DNS record in that space that could work.
Edit: To clarify, the DNS record is created via DHCP
Create static host records for those required, then set the permissions to them to deny writes. That should prevent them from being updated.
I am having issues with my DNS. I am setting up a new domain and have Windows Server 2008 R2. The domain controller is running on Hyper-V. Of course I can ping the FQDN internally on the Domain controller but not the host server.
When pinging the Netbios name from host the DNS resolves and ping is successful. When pinging using using FQDN (server1.contoso.local) I receive Ping request could not find host server1.contoso.local. Please check the name and try again.
I have done nothing to the network besides setting up the Active Directory. IP6 is disabled. The server and DC have static IPs and my router is the DHCP provider. The DC is DNS.
setup is as follows:
IP: 192.168.0.199
Subnet: 255.255.255.0
Default gateway: 192.168.0.1 (router internal IP)
Preferred DNS: 192.168.0.100 (DC IP)
Alternate: 192.168.0.1
When I attempt to join the domain I have to use the Netbios name (FQDN will not work; could not contact active directory domain controller). I am prompted to enter domain password but then receive the following error: "The following error occurred attempting to join the domain "domain-name" An attempt to resolve the dns name of a domain controller in the domain being joined has failed. Please verify this client is configured to reach a DNS server that can resolve DNS names in the target domain."
I have disabled the firewal on both the host server and the DC. I have attempted a /flushdns and a /registerdns. No changes. When attempting to renew the ipconfig on the DC I receive the following error: "An error occurred while releasing interface Loopback Pseudo-Interface 1: the system cannot find the file specified"
Is my problem simply a missing DNS entry? I unfortunately do not know much about DNS.
Thank you in advance.
I was able to resolve this issue on my end by adding the domain name suffix to the host's NIC.
I actually just resolved my issue. One key bit of information I completely forgot to mention was that I have 2 NICs installed and in use on my server. One of them is assigned strictly to the VM Domain Controller. Because of this a virtual network connection was created. For some reason that I don't entirely understand this was affecting my ability to see the FQDN on my network. I corrected the DNS settings on the virtual NIC and all my NETBIOS woes have left.
I don't really understand why that caused the problem, but changing the virtual NIC DNS server settings which defaulted to my router instead of my DC fixed the problem.