All Questions
Tagged with domain-name-system dhcp
320
questions
0
votes
1
answer
27
views
How to mix DHCP-provided DNS servers with statically written DNS servers?
I am trying to make a combination of the DNS servers provided by my ISP and 3 static (8.8.8.8, 1.1.1.1 and 9.9.9.9).
On Ubuntu 18.04, I did it by adding the static DNS to "/etc/resolvconf/resolv....
- 15
1
vote
0
answers
36
views
DHCP and DNS on a custom internal vSwitch?
In Win 11 I've configured in Hyper-V a custom internal vSwitch with NAT as follows:
New-VMSwitch -SwitchName 'VM NAT switch' -SwitchType Internal
New-NetIPAddress -IPAddress '192.168.2.1' -...
- 213
0
votes
0
answers
89
views
IPv6 / Kea DHCP / Ubuntu 20.04 / DNS Server Issue
Here is my current setup:
I have IPv6 / IPv4 enabled in my environment.
My router is doing RA for that IPv6 subnet.
Router is configured with other options flag.
I have Kea DHCP6 / DHCP4 server ...
0
votes
0
answers
439
views
DNS Suffix List is getting weird on Windows Server 2022
I had a look on my Windows Server 2022 template and figure out the following things:
If I run ipconfig /all, i can see there's 'test.local' as Global Suffix Search List and there's gael-test.net as ...
- 343
0
votes
0
answers
59
views
Dual dnsmasq name resolution
For resilience, I have two dnsmasq instances providing both local DNS and DHCP. DHCP is configured to offer separate IP ranges from each instance.
I then add IP reservations to the /etc/dnsmasq.d/99-...
- 1
0
votes
0
answers
704
views
dnsmasq not resolving hosts properly
Using DD-WRT, dnsmasq seems to be failing to correctly resolve hosts, and I can not understand why.
root@gcs:~# cat /etc/resolv.conf
nameserver 192.168.1.1
root@gcs:~# cat /tmp/dnsmasq.conf
...
dhcp-...
- 695
0
votes
1
answer
617
views
Same FQDN for different IP depending on connection
I run a Kerberos / LDAP user authentication on Debian, which works nicely for decades. I now would like to use notebooks, which may connect by wire or by WiFi. I'm stuck thinking how to set up this ...
- 285
1
vote
0
answers
221
views
How to configure dnsmasq per interface nameservers from DHCP leases
I am working on an IoT device that has three network interfaces: Ethernet, WiFi, and LTE. The interfaces provide redundancy and fail-over for network connectivity, and any combination of the ...
0
votes
0
answers
498
views
Deleting all dynamic DNS records from AD-Integrated DNS server? What can go wrong?
[1 Forest, 1 Domain, 2 DCs and nothing more - nothing special]
Is it OK, to remove all dynamic records from DNS.
If I decide to do so, should I do the same on the second Domain Controller?
Beside one ...
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-1
votes
1
answer
62
views
Should my device combine local DNS and static DNS?
Our linux based device was originally configured to use locally DHCP assigned DNS servers (in busybox/udhcpc.script). However after encountering a customer with this misconfigured, we changed the ...
- 103
1
vote
0
answers
8k
views
Dynamically register hostnames on DNS server (via DHCP)
I want to set up a small network, where a central DHCP server leases IPv4 addresses to the clients. The clients already have their hostnames set and should advertise those to the central DNS server, ...
- 121
0
votes
1
answer
211
views
DHCP , DNS , FTP , what is the best way to run ? dockerize or just simple install on ubuntu? [closed]
I'm going to install DNS and DHCP and simple FTP service on my company network. My network has about 200 clients, what is the best way to install those services? on a docker environment or just simple ...
- 5
5
votes
1
answer
1k
views
Setting up an Access Point, Raspberry Pi, and Laptop to serve a website in a classroom. "The internet in a suitcase" [closed]
Our trainers experience bad internet connections at some schools. I would like to provide them with a "mobile" (as in take it on the train) version of our platform running on a laptop, which ...
- 153
0
votes
1
answer
106
views
How can I implement single letter domains for LAN internet browsing using dnsmasq?
In our LAN I have several services running in multiple hosts, and clients using DHCP with dnsmasq.
My goal is that any user can type a single letter (e.g. c) in the browser search bar and get in ...
- 101
0
votes
1
answer
688
views
Can't ping non-domain joined client by name from subnet but Name and IP appeared in addresslease on dns server
is it posible to resolve the name of a non-domain joined device by ping? the dns server has registered the device. name and Ip are registered in addresslease.
Ok, this is what I have tried:
If I ping ...
0
votes
0
answers
192
views
Can a Microsoft DHCP server be configured update a Microsoft DNS server with a configured hostname, ignoring the client supplied name?
I have been struggling with this for a few days now, and am really at my wit's end. Our infrastructure is very heterogeneous with a mix of hardware devices and virtual machines running a variety of ...
- 427
0
votes
0
answers
41
views
Why Do Our Remote Connection Softwares Drop Until DC is rebooted?
I have been having a recurring issue (1-50 times/week!) where all employees using a remote connection software drop out at the same time and cannot reconnect until I reboot the DC (i.e. They get a &...
- 101
-1
votes
1
answer
245
views
bind9 not resolving intranetlinks
As a follow up to a question I've asked earlier: Linux server migration to Windows workstation. A supplier got us a new network-card yesterday, but no harddrives so far. I've also bit the bullet on ...
- 101
0
votes
1
answer
2k
views
Dynamic DNS updates via DHCP on CentOS
I'm running mostly Ubuntu VMs in an vSphere cluster where a VLAN is managed by a Windows DHCP and DNS. From the Ubuntu VMs I can update the DNS records in the Windows DNS to point the dynamic IP to ...
- 179
3
votes
0
answers
2k
views
dnsmasq: How to set alias domain / multiple DNS suffixes for local hostname resolution?
Is it possible to set multiple search domains via dnsmasq/DHCP? Due to some migration, I need multiple clients to be able to:
ping server.old-domain
ping server.new-domain
# both should work, .old-...
- 31
0
votes
1
answer
29
views
Business's networking goes down when main DNS server goes down despite backups
Our business has multiple DNS servers that are AD-integrated. Our main server is WS 2003r2 (soon to be retired) and has AD, DNS, and DHCP. I believe that it is our only DHCP server. The last time we ...
- 25
0
votes
1
answer
417
views
VLAN and DHCP conflicts. /renew and release only works temporarily [closed]
In our small company, we have VMs on ESXI. One of them being the Domain Controller.
We have Avaya phones with their IP being (192.168.0.11), our IP range is mutually exclusive from Avaya.
Our Desktops ...
0
votes
1
answer
348
views
Domain controller not allowed to register its roles in DNS
I'm adding a physical server (and some virtual hosts running on it) on a company network in the domain "comp.net". I'm not allowed to modify the DNS- or DHCP servers and cannot create any ...
1
vote
2
answers
650
views
What causes a computer/phone/device to do a DNS lookup for its own hostname?
The two main things I'm wondering are:
What causes a computer/phone/device to do a DNS lookup for its own hostname/FQDN
How long after a device leaves a network will it retain the "settings"...
- 63
0
votes
0
answers
239
views
Oracle Linux 8 getting DHCP but DNS not updating
My Oracle Linux 7 boxes automatically get a DHCP address and then BIND9 DNS is updated successfully.
I recently installed an Oracle Linux 8 box, and while it is successfully assigned a DHCP ip address,...
- 31
1
vote
2
answers
408
views
Is it safe to use DHCP Discovery to get DNS servers in my program?
I'm trying several ways to retrieve available DNS servers, for example, using a custom configuration file, using /etc/resolv.conf, using command line systemd-resolve --status.
Also I implemented a ...
- 19
-1
votes
1
answer
426
views
External Internet Access when Domain Controller is offline [closed]
We have a single Windows Server 2019 Domain controller. We do not have a backup domain controller.
The Windows Server 2019 Domain Controller is also our DHCP server, and our DNS server.
When the ...
- 11
-1
votes
1
answer
115
views
How can I Host a website with a Domain name just within the Local Network?
I host a website on a local network with XAMPP. I usually access it with the IP address on another device.
How can I host my website on a domain like website.local ?
My OS is Windows 10 but if needed ...
- 101
0
votes
1
answer
560
views
DNS Records After DHCP Scope Change
Our company is growing and I had to take down a DHCP scope one of my networks is on and add a new one. Scopes look like this:
Old Scope: 192.168.1.0/24
New Scope: 192.170.1.0/24
This was part of a ...
- 835
1
vote
0
answers
227
views
How to pass VM name (not hostname) to VM during provisioning
THE SHORT VERSION
When provisioning a new VM through the vCenter API, we need to pass the VM's given name (the name given in the vCenter UI, not the hostname) to the OS during the initial boot/...
- 121
1
vote
0
answers
175
views
Register DHCP hostname in DNS only if a domain member
I have an Active Directory domain, where the Domain Controller also runs our DHCP service and was recently updated to Windows Server 2019. This DHCP service is also used for a public wifi network on a ...
- 13k
2
votes
1
answer
5k
views
What happens when specifying multiple dns servers with DHCP Option 6?
If I have the following DHCP option 6 (DNS), what happens?
6,1.1.1.1,8.8.8.8
Will 1.1.1.1 be served, and 8.8.8.8 as fallback if 1.1.1.1 fails?
Extra context: I am running odhcpd on OpenWRT with pi-...
- 181
1
vote
0
answers
60
views
Why has my domain controller remembered its dns/dhcp settings from before a reinstall?
Recently due to a hardware upgrade/replacement we powered down the whole domain (this is a small office so it's all on one server (ADDS, DNS & DHCP)) but when we powered up the network couldn't ...
21
votes
3
answers
3k
views
IPv4 To IPv6 Migration Advice
I'm currently working on adding IPv6 capabilities to our network, and I have some questions on what is considered best practice in 2020 to convert some of the IPv4 concepts we are used to into the ...
- 346
0
votes
1
answer
398
views
Why create a reverse DNS record for every device that connects to a wireless network?
There's this network I connect to often. After some experimentation, I figured out that when you connect to the network, the DHCP server assigns you an FQDN that usually follows the scheme <your-...
- 63
0
votes
0
answers
93
views
DNS A Records Disappear On Multi-NIC Server
I have a 2 Servers running as a top Level DCs on a Parent Domain. They are running DNS for the following addresses.
192.168.1.X (DHCP)
192.168.10.X (Static)
I have 2 servers running as child level ...
- 835
2
votes
0
answers
3k
views
Dynamic DNS (DDNS) updates from dnsmasq for use with bind9
Previously I ran dnsmasq on an OpenWRT to provide DNS and DHCP functionality, because this is, what it is intended for. I want to offload the DNS part to an already configured bind9 (running on Ubuntu)...
- 21
1
vote
0
answers
1k
views
DHCP & DNS: Hostname Resolution
Just making sure that I understand correctly, When a new node on the network joins the LAN, it sends the DHCP server its hostname, and after the DHCP server acknowledges the requested hostname, the ...
- 11
2
votes
1
answer
4k
views
Set hostname using cloudinit for dhcp server: Systemd overrides cloudinit hostname
For a testing environment, I want to connect multiple VMs using DHCP with their hostnames as DNS entrys. The troubleshooting shows that my DNS/DHCP works. But the VM got registered using ubuntu as ...
- 506
0
votes
0
answers
295
views
Setting DHCP and DNS servers
This is the topology I'm working with:
enter image description here
I have configured the routers like this:
Router_1_Mikrotik
ip address
add address=192.168.10.10/25 interface=ether1
add address=...
- 1
1
vote
0
answers
360
views
Does Ubuntu 18/Linux respect the order of DNS servers?
Does Ubuntu/Debian (or Linux in general) respect the order of the DNS servers? Let's assume clean installation of Ubuntu 18.04
In Ubuntu 18, you can setup the DNS servers like this:
Aka does it take ...
- 137
0
votes
1
answer
1k
views
GCE DNS forwarding
I'm trying to setup local DNS forwarder for the VPC network to use LDAP controller which is running DNS server.
I have few GCP projects which should be able to communicate over already built VPN ...
1
vote
1
answer
808
views
Delete DHCP lease if DNS record is updated
Situation(Windows Environment):
Three DHCP scopes with 3 different subnets.
A user uses his notebook in all three subnets in one or two day's. Now, there are 3 dhcp leases at the same moment.
The ...
3
votes
2
answers
4k
views
Is it possible to have name-resolution from Fortigate and local DNS server?
Can you advise on moving to a hybrid DNS?
Currently, all our LAN machines receive their IP address from our Fortigate 60D (each machine is either allocated an IP address from the Fortigate DHCP, or ...
- 949
1
vote
0
answers
207
views
Dynamic DNS, basic configuration not working
I'm trying to implement DDns, where DHCP daemon updates dns records instead of myself. From what I understand, it should work. But it doesn't. I would be very grateful, if somebody points out my ...
- 21
10
votes
2
answers
19k
views
Registering linux hostnames on windows DNS
How do I register DHCP linux client's hostnames in a windows server DNS?
I have a small-business mixed network with:
DCHP Windows workstations (Example hostname: win1)
About 10 machines
Machines ...
- 351
1
vote
0
answers
533
views
IPV6 Small Business Implementation - Windows DHCP/DNS, PFSense, IPV6
I have some confusion about IPV6 on a Small Business Network. I'm sure one part or the other is covered extensively, but I can't seem to find answers.
(Background info) I have a home network that ...
- 11
1
vote
1
answer
3k
views
Dynamic DNS client records not being updated correctly
Our network is running Windows and macOS clients all of which are joined to Active Directory. The Macs are all running Windows via Bootcamp. We were having issues which were being caused by our macOS ...
- 243
0
votes
1
answer
75
views
Replacing Windows Server 11 with NAS
I have been running a Windows SBS 11 via VM Ware, it is on its last legs and I have copied the last database to a Synology NAS. In removing the server from the network I realise I will need to enable ...
- 1
3
votes
1
answer
8k
views
How does DNSMasq integrate with my router?
Context
I've successfully installed DNSMasq on a Debian machine and everything seems to be working. Here's what I did:
install DNSMasq with sudo apt-get install dnsmasq
update file /etc/dnsmasq.d/...
- 45