Questions tagged [dhcp-server]

Dynamic Host Configuration Protocol (DHCP)

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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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34 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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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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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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25 views

How to disable dhcp server in dnsmasq?

I want to start a hotspot on PC with DHCP disabled. I started hotspot using nmcli command: nmcli device wifi hotspot con-name NIMISHA ssid NIMISHA band bg password copernicus could see dnsmasq-dhcp ...
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39 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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35 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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40 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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111 views

Finding embedded rogue DHCP-server in Windows 10 computer

Rogue DHCP-server detected and narrowed down to be in my laptop. Seems to be embedded since it can't be viewed in Windows by name, IP nor MAC. Running a network 192.168.192.0/21 (really eight ...
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143 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
55 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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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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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
18 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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42 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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155 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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175 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
652 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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81 views

DHCP lookup fails for Apple devices and Chromebooks but works for Windows Machines

I am responsible for a school network and we have a strange problem. Windows devices work fine but any Apple device or Chromebook will not connect to the network automatically. There is a message on ...
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1answer
103 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
84 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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2answers
406 views

isc-dhcp-server fails if interface not connected on reboot

On Ubuntu 18.04 on my gateway server, I've installed and configured isc-dhcp-server, but it doesn't start up (i.e. it fails to start) if there's nothing connected to enp2s0 after a reboot. Note it ...
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1answer
160 views

How to fix DHCP server after main switch replacement

I am a computer science teacher in a small school who is getting to grips with a role as server/network admin. Today, we all lost internet connection and were unable to access the server remotely. It ...
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75 views

DHCP server ignoring DHCP requests

My DHCP server is ignoring DHCP request from specific client. Using tcpdump in my host controller (where DHCP is served from) I can see the requests 21:50:12.909484 IP (tos 0x0, ttl 255, id 1319, ...
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21 views

ISC DHCP server adding leases given by other server to his database file

Here is my situation: I want to create an Internet-filtering device, using a small ARM device running Debian Buster. It must act as a gateway, and for that purpose I set an ISC-DHCP server on it, that ...
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1answer
448 views

Windows Server 2016 Dhcp failover configuration

I've built a new AD domain and I've got 2 dhcp servers (2016 & 2019) that have been setup in a Failover partnership. I've tested it and it's working correctly. I decided to RENAME both of these ...
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1answer
13 views

intermittent wifi/LAN client connection issues with dhcpd and bind9 on ubuntu server

I have a soho LAN with a gateway server running isc-dhcpd-server and bind9 on one NIC 192.168.0.3 for the LAN & wifi. The client connects to the LAN but often can't see the server on 192.168.0.3 ...
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39 views

Juniper router SRX DHCP issue

I am trying to set multiple subnets on SRX device each subnet has its own DHCP pool. I have 5 ports each port is connected to a group of servers. So, I configured 5 pools and 5 groups each group ...
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24 views

DHCP, DNS, DC on single VM

I'm trying to install simple scheme of server: Hype-V as host DNS, DHCP, DC on single VM. However I've got difficulties with make my DHCP server work - client devices got IPs only from my MikroTik ...
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2answers
358 views

AD/DC, DNS and DHCP on Hyper-V host

I'm trying to set up AD/DC with DNS (reverse lookup zone) and DHCP on single Hyper-V host. Network diagram On the diagram is pretty everything I've set, the rest should be on default, however I'm ...
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202 views

WDS and DHCP on different server to provide pxe boot

I have two standalone windows server 2016 which configured with WDS and DHCP respectively, and they are located in the same VLAN broadcast domain. I want them to provide PXE boot for client machines ...
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1answer
80 views

move DHCP service to another windows server seamlessly?

i've searched similar answers on serverfault and google but i need to clarify the procedure to do this. i have a old windows server 2012 which provides dhcp service and now want to transfer this dhcp ...
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2answers
318 views

Using DHCP to Manage Servers

There is a thread from about 9 years ago that I was reading when looking into whether we should change the servers in our environment to DHCP. Here is the Link. DHCP addressing vs Static ...
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1answer
2k views

Force client to send DHCP options to next-server

We currently have clients connecting to a DHCP server when asking for an IP. We then redirect to next-server with some additional options. The next server has a DNSMASQ running that should be able to ...
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Windows Server DHCP not working

I have an Active Directory network consisting of a Windows server 2019 domain controller with DHCP and DNS on it too. New clients on our network are failing to obtain IP Addresses from the DHCP server,...
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309 views

DNS server information not provided to DHCP clients by dnsmasq

I am trying to utilize a Raspberry Pi with Raspbian Stretch (Linux) so provide additional network monitoring and also routing capabilities. To this end I have the following setup: Internet router [...
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1answer
154 views

windows deployment services to windows 10

I am currently in Computer Assisted Tech training I have difficulties for the image deployment service. I want to deploy a Windows 10 image on HP Pro Book 650G1. I have a Windows 10 Pro x64 For this ...
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2answers
287 views

How to serve custom DNS server to DHCPv6 clients in OpenWRT?

How to serve custom dns to dhcp clients in openWrt? explains how to serve custom DNS server for DHCP clients on IPv4. But how to do it for IPv6? I tried adding DNS server's IPv6 address but it doesn'...
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Windows Server 2003 DHCP convert all leases to reservations

In Windows Server 2003 DHCP, is it possible to convert all DHCP leases to reservations automatically? I know I can right-click an address and create one manually, but I'd like for any lease in a ...
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58 views

DHCP Server shutting down?

I have a Server 2012 R2 Essentials server, which is the PDC in the domain. I also have another 2012 R2 server acting as a domain controller for times when the primary is down. I have setup DHCP on ...
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2answers
84 views

DHCP Server stopped working

I've been searching all day long, but nothing helped so far. Computers without lease can't connect to the network. Everybody else who has an active lease doesn't have any problem. We use DHCP Server ...
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1answer
313 views

How can I make the Domain Controller the client's default gateway?

I'm migrating from a SBS 2008 DC to a Windows Server 2016 DC. On the SBS DC, DHCP is set up and I've migrated this successfully to Server 2016. The PC's in the office use the SBS DC as their default ...
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28 views

Changing Default Gateway Netgear Wireless Routers

We have a server that is managed by our ISP. We do not get their help that much and they only have the admin password for the firewall/server. Every time I plug in a wireless router, it automatically ...
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248 views

Clear routes from DHCP option 121

I have 3 subnets 192.168.10.0/24 192.168.103.0/24 192.168.2.0/24 Most of them can route to each other via static routes defined in their respective default gateways. However due to some ...
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Cannot add DHCPv6 reservation on Server 2012 R2 (error 20022)

I am trying to add DHCPv6 reservations on a Windows Server 2012 R2, but I do not want to use the "random" IPv6 the server chose (convert lease to reservation), but I want to use another, specific IPv6....
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225 views

vlan for segmentation, same subnet one dhcp server

I do not know if this is the correct setup. I need to isolate three ports on three different switches from the other ports (update: so they are separated from the others and also have access to the ...
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1answer
24 views

Does it make sense to have several subnets under a ethernet port for a dhcp configuration?

I would like to know if it makes sense to set several subnets under a ethernet port. The configuration on dhcpd.conf is listed below: subnet 192.168.10.0 netmask 255.255.255.0 { #ethernet port ...
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110 views

How can I find (or compute) a client MAC address when using the strongSwan DHCP plugin?

Server strongswan.conf libtls { suites = TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA } charon { plugins { dhcp { # Always use the configured server address. force_server_address = yes ...
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1answer
119 views

Offline Windows DHCP

My company is needing to switch over from our current DHCP server to building out a new virtual machine Windows 2016/2019 DHCP server. The question I have is, can I build the server and configure ...
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1answer
38 views

Pfsense networking, routing and rules

I'm new to pfsense I just installed it today. I'm trying to configure a DHCP server. I have three interfaces the WAN, LAN and Guest Network. I configure the LAN to 192.168.0.1/20 and the WAN is DHCP ...

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