Questions tagged [dhcp-server]

Dynamic Host Configuration Protocol (DHCP)

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15 views

DHCP DDNS Updates to secondary DNS sever

I am trying to configure DDNS updates from the ISC DHCP server to the zone that is hosted on the windows server, in the dhcpd.conf I have zone section a below zone example.com. { primary 192.168.0.45; ...
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1answer
31 views

DHCP server in packet tracer [closed]

My DHCP server in packet tracer isn’t providing a default gateway it only shows up address? I configured probably but I don’t know why doesn’t show the gateway?enter image description here
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Server DHCPv6 with Linux Alpine

I want create a server dhcp6 with alpine I'm using Kea-dhcp6. The my file config this is: { # DHCPv6 configuration starts on the next line "Dhcp6": { # First we set up global values &...
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91 views

netplan - Network with DHCP configured, but no internet

I am trying to configure my Ubuntu Server 20.04 LTS to use DHCP in its network configuration. Many tutorials on the internet recommend that I create the following file with the following settings... ...
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1answer
87 views

Unable to add forward map SERVFAIL/REFUSED DDNS

I am using bind9 on a primary dns server with two secondary dns servers in a master/slave relationship. I am attempting to implement DDNS but seem to be running into a problem when it comes to adding ...
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66 views

Block the DHCP server from broadcasting into the second ethernet interface

I have setup my DHCP server by following the instructions in https://wiki.debian.org/DHCP_Server. This all works but the issue I am having is the DHCP server is being broadcast in the main company ...
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2answers
52 views

Dhcp reserved addresses

Is it better to use a dhcp server to reserve addresses based on mac address or to assign them statically on the interfaces? I have a small network and i want almost everything to have static ip ...
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1answer
112 views

Hosting Azure Active Directory and retiring on-prem AD

Background:- We have Office 365 licenses and all employees have their individual mailboxes. Currently there is one Domain Controller, which not only hosts Active directory but also acts as DNS and ...
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2answers
93 views

How does a router with DHCP and a custom DNS set deal with client DNS settings?

I have a custom DNS server in my network that I want all clients to use (it has ad-filters etc, similar to PiHole). I have set my router (LinkSys Velop) to use this DNS server. However, on the DNS ...
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450 views

DHCP not updating dynamic DNS record which has an associated CNAME record

I have an Active Directory domain corp.com, which has a child domain dev.corp.com. Each domain has a pair of DCs. For the top-level AD domain, DNS, as well as DHCP, runs on both ADs. For the child ...
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1answer
60 views

Standard Windows Server 2019 wizard setup with AD, DNS & DHCP does not resolve any DHCP client names

I am working myself through learning and setting up a pretty standard Windows Server 2019 (Essentials edition) serving as an AD PDC, DNS- & DHCP server for a very small network. I followed some ...
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1answer
60 views

Different lease duration for dhcp clients

Is it normal in Windows implementation of DHCP Server and DHCP Client that some clietnts gets strange long lease expires time like 15 days? ,,Lease duration for DHCP clients'' setting in DHCP Server ...
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1answer
200 views

What are the symptoms of an IP address conflict?

System administrators must take special precautions when setting up two DHCP servers on the same network. The most common problem caused by competing DHCP servers is an IP address conflict. Windows is ...
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2answers
114 views

Unusual DHCP activity after power outage

Over the holiday weekend, one of our clients experienced a power outage. When everything came back online, most devices seemed to be fine, but a few (one of our ESXi hosts and a number of VDIs) could ...
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How to migrate dhcp server superscope?

I have super-scope dhcp server on Windows Server 2008 and I want migrate it to new Windows Server 2016 with all scopes, leases and reservations. Is there any way to do this? I know there is netsh dhcp ...
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74 views

how to setup dhcp relay in maas?

I have 5 subnets and I don't know how to set them on MAAS subnet to connect to a one dhcp relay agent. image1 Do I have to add each subnet to specific vlan and fabric or as shown here they all can be ...
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1answer
136 views

DHCP Scope Option Sync Scheduled Task

I have two Server 2019 domain controllers with DHCP services running in load-balance mode, which synchronizes leases but not scope options or reservations unless instructed to do so via PowerShell. So ...
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24 views

Linux Distributed Switch Architecture with Local Option82 DHCP server/DHCP relay

I share the following problematic for an embedded system we need to update for a customer. Customer requirement is: all my IP cameras connected to your product SHALL get, by DHCP, their IP address ...
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40 views

Windows DHCP server Rogue Detection algorithm

I'm getting rogue DHCP traffic leaking in from my ISP, through my router, and my Windows DHCP server is shutting down. What does MS Widows DHCP server 'Rogue Detection' detect? At least so far, none ...
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2answers
54 views

Auto Restore DHCP Backup on Microsoft DHCP Server When Restart (Windows Server 2019)

I have a Windows Server 2019 with DHCP Server installed and a scope configured. To protect the scope from accidental misconfigurations or disasters, I'd like to set a protection method so when I ...
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1answer
98 views

DHCP Scopes For 2 VLANs

I am running a Windows Server 2019 as a DC running DHCP. I am running a single scope running through a NIC to handle addresses for our small network. I am being asked to add a second DHCP scope so it ...
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1answer
85 views

Process to migrate DNS and DHCP from on-premise, Windows domain controller

Our organization has an on-premise, Windows, domain controller that we'd like eliminate in favor of a local DHCP/DNS server on either our Unify switch (first choice) or FortiGate VPN appliance (second ...
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456 views

How does MS DHCP server decide which DNS server to try to dynamically update?

In MS DHCP, under Scope Properties, on the DNS tab, it says: You can setup the DHCP server to automatically update authoritative DNS servers with the host (A) and pointer (PTR) records of DHCP ...
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1answer
134 views

Obtaining IP Address when Using NPS/RADIUS with existing lease from Windows DHCP

Problem: I have DHCP clients on a Windows AD network contoso.local, that often can't get an IP address after successfully authenticating over the RADIUS/NPS Server. I found that if the device has an ...
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1answer
104 views

DHCP Server Authorized But Won't Work

I have 2 DHCP servers that I have had to replace. On I unauthorized the old servers and when I go to authorize the new servers, it is added to the authorized list but the IPV4/IPV6 areas still show ...
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53 views

I've configured Windows Server 2012 R2 as a DHCP Gateway with RAS but loses connection after a while

I have configured my Windows Server 2012 R2 with 2 Network Adapters with NIC A connected to the Internet with IP 192.168.254.1 and NIC B connected to the local network with a Static IP 10.0.0.1. when ...
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1answer
888 views

RRAS VPN Server - Using DHCP to assign IPs from specific scope

I am trying to configure a Windows 2019 RRAS VPN server to use DHCP for VPN address assignment from a specific network. RRAS VPN Server - 192.168.1.20 DHCP Server - 192.168.1.10 VPN Network / Scope - ...
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32 views

Setting a “statical” running of MS DHCP server

I am trying to setup a MS DHCP server that runs in some kind of "statical assignment" mode. The goal is that prevent clients automatically receiving IP configuration from DHCP. I want them ...
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11 views

Can not further distribute IP address from Microsoft DHCP Server

Recently I change from 192.168.38.0/24 to 192.168.38.0/23 then delete old scope and create a new scope from 192.168.38.51 to 192.168.39.239 I had excluded 192.168.38.240 - 192.168.38.254, and 192.168....
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1answer
112 views

Does the linux bridge have in-built DHCP and DNS server? [closed]

Does the linux bridge have a dhcp server built in to the bridge software? And does the linux bridge support working as DNS-Server or it can only point towards the DNS server on the host or none. If ...
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343 views

Automatic restart of isc-dhcp-server

I'm a Debian and Raspbian newbie, and have a question about automatically restarting the ISC DHCP server. I have a Pi running Raspbian and the ISC DHCP server at a remote site with flaky power. ...
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1answer
52 views

Dns configuration in windows changes unintentionally to manual mode

We have a Domain controller (windows server 2012) in our LAN, there is also a DHCP server for clients to get them IP automatically. all clients give right ip and dns configurations and work as well ...
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1answer
142 views

Microsoft DNS server doesn't add new DHCP lease from Linux

Server Setup: Microsoft DNS + Microsoft DHCP server Client Setup: Linux live CD as DHCP client Question: dhclient could get the IP assignment from Microsoft DHCP server, I could see the entry on the ...
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2k views

Windows 10 fails to register host to DNS server on boot

So the situation is as follows. We have rolled out Windows 10 laptops that auto-connect to the wireless. The clients are Windows 10 and the DNS and DHCP server are Windows. When they are docked, ...
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1answer
224 views

Why do we need both DHCPOFFER and DHCPREQUEST?

In DHCP DORA process, the server offers a client an IP address with DHCPOFFER message. Why does the client have to send an explicit DHCPREQUEST message again to the server? Why not send a DHCPACCEPT ...
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1answer
21 views

dhcpd unexpectedly destributes a useless route for another subnet as a default gateway

Our dhcpd.conf defines two subnets such like, subnet 192.168.0.0 netmask 255.255.255.0 { option routers 192.168.0.1; # internet gateway } subnet 192.168.1.0 netmask 255.255.255.0 { option ...
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1answer
487 views

DHCP within DNSMASQ not reached for IP address requests

Due to a device loss in the network, a new DNSMASQ configuration has been brought in on a different server. The server happens to be a Raspberry Pi 4B. Many devices are able to obtain IP addresses, ...
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1answer
53 views

Whats the best way to get multiple sites to connect to a central server?

So lets say that there's 4 sites: orange, blue, yellow, and green. (screenshot for reference) Site 1 (orange) is where the central server would be located. this server has AD,DNS,and DHCP servers. ...
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1answer
41 views

Loop do until fails after exception

do { Try{ if (New-Object System.Net.Sockets.TCPClient -ArgumentList $server,3389 ) { Write-Host $server 'Ready for RDP connection'-ForegroundColor Green } } catch { write-warning $error[0] } }...
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4answers
704 views

in-addr.arpa zone delegation in Bind 9 and Samba 4 as an AD DC with DDNS

Environment and goals In my testing KVM lab I have a virtual network 172.16.50/24, in this network I have got 2 Centos 7 VMs running Bind 9 and ISC DHCP servers: Мастер DNS : controller.wsvirt.home (...
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1answer
234 views

Error while checking IPv6 address using Get-NetIpAddress

Get-NetIPAddress -AddressFamily IPv6 -AddressState Preferred -SuffixOrigin DHCP | Select IPAddress I am facing the error below while executing above script. It shows the correct IPv6 configurations ...
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1answer
346 views

bootp setup in Linux

We are currently replacing our old HP-UX system which does bootp for some equipment that we use here in our facility. I have the old bootptab file from the unix server and ISC dhcp server installed on ...
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1answer
140 views

DNSMASQ Not recieving DHCP requests/ DNSMASQ Not sending

I have a Fedroa 31 BOX that I'm trying to use as a dhcp server. It doesnt appear to be functioning. I have used dhcping 192.168.1.xxx where xxx is ip address of server and the output is always no ...
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1answer
21 views

DHCPd IP dispatch

For my tests, the following was done with 2 virtual machines. The server is under CentOS7 and the client under Windows 10 (MAC : 08:00:27:bd:3d:ab). After every modification on the server side, I ...
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1answer
62 views

Enabling DHCP on Linux Host for libvirt VMs

This is a follow up question from here: How to disable default DHCP on virbr0 and obtain IP from DHCP on host I have a Ubuntu server 18.04, with Libvirt based Virtual Machines setup over virbr0 ...
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1answer
1k views

How to disable default DHCP on virbr0 and obtain IP from DHCP on host

I have a Ubuntu Desktop, with Libvirt based Virtual Machines setup over virbr0 bridge. Currently libvirt's default DHCP server (dnsmasq) provides IP address assignments. root@ngadre-Inspiron-3542:/...
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1answer
1k views

On raspberry pi static IP DHCP server on eth0 erratic and kills wifi. What's wrong?

On a Raspberry Pi 3B+ I want to have a all the functionality services (ssh, vnc, dhcp) on a wired intranet on eth0 and the Internet wirelessly on wlan0. I have installed the servers and under some ...
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1answer
868 views

How to configure OpenVPN to update Bind9 entries for local domain?

I have found an article describing how to configure dhcp3 server to update a Bind9 zone with the hostnames and assigned ip addresses. I want to achieve the same effect, but inside a VPN subnet, where ...
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1answer
834 views

No subnet6 declaration for eth0

I keep getting this error in my syslog when I try to start a dhcp6 server. The command I use is. sudo service isc-dhcp-server restart The error I get is: No subnet6 declaration for eth0 (fd30::1:...
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1answer
294 views

Why is my DHCP client w/ reserved address missing the default gateway?

I'm running isc-dhcp-server on Ubuntu 18.04. Clients without a DHCP reservation are able to get an IP address, subnet mask, default gateway and DNS servers from the pool no problem. As soon as I ...

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