Questions tagged [dhcp]

DHCP stands for Dynamic Host Configuration Protocol and is an auto configuration protocol used on IP networks and an extension of the Bootstrap Protocol.

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How-to stop NetworkManager requesting a DHCP lease when configured manually?

I run networkmanager together with cockpit on Debian Buster. I have one physical interface and three VLANs on top of it. All of them are configured to have static IPs (ipv4.method: manual). However, ...
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Why aren't inherited scope options replicating between Win2019 DHCP servers in a failover config?

I have 2 Win 2019 DCs, both running DHCP servers with a scope configured for failover. If I explicitly set scope options on one, they properly replicate to the other server. But options inherited from ...
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win Server not responding to DHCP Discover on vlans

Im pretty new to the topic, Im an electronics engineer so im naturally missing something in my IT config :-) im trying to set up a network for a non-profit organisation (small sports club) with the ...
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How to register RRAS VPN clients in DNS with DHCP doing secure dynamic updates?

A past MSP configured our Windows servers (2012 R2) like so: SERVER01 (10.0.0.1): DC + DHCP + DNS SERVER02 (10.0.0.2): RRAS DHCP is handing out IP addresses in the 10.0.0.50-240 range. DNS is ...
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Stop Google Compute instance from configuring second network interface

I'm spinning up a VM in Google Compute Engine running Debian Buster, and configuring it with two network interfaces. The first uses an ephemeral IP config, and is assigned to a publicly routable ...
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How does the IP address lease process work?

When a Computer-A has just received an IP lease, for example 2 hours. If it is immediately turned off for about 30 minutes and new devices are connected, can any of these new devices receive the IP ...
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Asus RT-AC88U: prevent IPs ouside of router's DHCP range

I'm using Asus RT-AC88U router (with Merlin firmware) for home network. Recently I added new device to the net - Qnap NAS. After some period of time I realized that my PC uses the qnap as DHCP server -...
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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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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-...
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syslinux pxe boot windows 10 with winpe iso - CDBOOT cannot boot from CD - Code: 5

I am trying to install windows 10 via network boot on a VM (later on, I want to do that on real computers). Therefore I use Debian 9 and VMWare 12. On my Debian system I have implemented an isc-dhcp-...
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Is there anyway possible to use a static ip with my host machine and still allow guest VMs to use DHCP?

Here's my case: I'm running 18.04 ubuntu and I have two guest VMs running on qemu/kvm. My machine has a single NIC. I'm using /etc/network/interfaces for this config. My current file looks like this: ...
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DHCPv6 (RFC 8415) - What are reasonable initial values for time intervals T1/T2?

As described in Section 18.2. - Client Behavior of DHCP - RFC 8415 a client uses the Solicit message to discover DHCP servers configured to assign leases or return other configuration parameters on ...
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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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SNMP: How to monitor devices that do not have static IP adress with Zabbix

I have some equipments in my LAN but the way things are working; I cannot set statics IPs for them, they really need to have DHCP enabled. I am using Zabbix, and for host configuration, the Ip ...
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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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Is it possible to have two DHCP server on the same LAN/SUBNET?

Is it possible to have two DHCP server on the same LAN/SUBNET? If so, how can you configure it? I'm doing some research and I'm getting mixed results. In one article, it says "On the same subnet, you ...
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DHCP SCOPEID to variable for reuse

I am trying to place Get-DHCPServerv4Scope into a variable for reuse later code is below. If I use Get-DHCPServerv4Scope -ComputerName "ServerName" |Select "ScopeID", I get the list of scopeID. ...
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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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Request an address from a range of IP-addresses using dhclient dhcp-requested-address

I am in a situation where I need myDevice (ubuntu), when connected to router, to have any IP address in the range of 192.168.1.20 to 192.168.1.40. I am aware that adding the line send dhcp-...
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PXE Boot laptop doesn't send out DHCP discover

ultimately im trying to get a PXE boot laptop to talk to the WDS server. While monitoring the switch using wireshark from laptop #2, it doesn't see ANY DHCP packet during a PXE boot. whereas, I would ...
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Basic 2 Routers configurations for noobs

So, my goal is to have each one of my devices connected to a double-NAT simple solutions. I've started my configuration with Router 1: IP: 192.168.1.254 Mask: 255.255.252.0 DHCP Ipv4: 192.168.1.10 -...
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libvirt NAT configuration - DHCP does not work

I want to use libvirt network NAT configuration. libvirt says https://wiki.libvirt.org/page/Virtual_network_%22default%22_has_not_been_started: "1) If you're not actually using dnsmasq on the ...
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Windows DHCP MADCAP Server Multicast Addresses

I am very familiarized with DHCP server role on Windows OS, but I have a doubt regarding multicast scope. From what I understand, a multicast scope will assign MADCAP clients with a multicast address ...
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Changing DHCP range makes me lose internet access

Hy, I'm trying to increase my network ip address from: IP DHCPIpv4: 192.168.1.10 - 192.168.1.250 Mask: 255.255.255.0 Server: 192.168.1.254 Gateway: 192.168.1.254 To IP DHCPIpv4: 192.168.0.10 - ...
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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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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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Should I assign static IP from within or outside DHCP pool

I've setup-up 192.168.55.0 network and set DHCP range from 192.168.55.100 to 192.168.55.200 now I want to assign static IP to my PC so should I assign IP that is not in DHCP range something like 192....
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Why one of my interfaces receives DHCP requests

I have a server with multiple interfaces. One [Eth_ext] is connected to external network and other two [eth0, eth1] are connected back-to-back to another server. Say eth0 is on 10.0.0.0/24 subnet and ...
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Override default gateway when using netplan DHCP

I would like to use DHCP for IP address assignment but I would also like to override/specify the default gateway. Is this possible in netplan? Something like the following (which doesn't work BTW)... ...
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Debian Buster - My network is configured as static but I am still receiving a DHCP address

I have a very simple /etc/network/interfaces file: auto lo iface lo inet loopback auto eth0 iface eth0 inet static address 192.168.5.5 netmask 255.255.255.0 network 192.168.5.0 ...
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L2TP (xl2tpd) IP Address Allocation

I’m making my own study of different ways to establish tunnels between Debian server (LNS) and Android OS (LAC). In case of L2TP without any encryption, LACs should routing traffic through ppp tunnel ...
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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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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 ...
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how do you determine the IP address of the top level gateway if there are subnetworks?

I posted this somewhere else, but someone suggested I ask it here. I live in a community that "provides" internet service to homeowners. So, in essence, the community has a fixed IP address, then ...
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Setting up DHCP with OVN

I'm trying to set up an environment similar to the one described here in which OVN will provide DHCP service to logical networks. I have a logical switch named `net0 with two ports: [root@ovn0 ~]# ...
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DCHP server on virtual machine in HNVv1 virtual network

I've got a virtual machine with Windows Server 2016 Datacenter, Hyper-V nested virtualization on the host operating system switched on for this virtual machine and Hyper-V role installed on it. PS C:\...
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How to forbid DHCP-server to lease specific IP address on Mikrotik's routerOS?

My Mikrotik router is running a DHCP server in /24 network, I would like to prohibit it to lease some IP addresses (I would like to use them statically on a couple of devices). Are there any ways to ...
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Replay DHCPDECLINE to host by edit ethernet address in dhcpd

I known in dhcpd.conf, I can use following config to assigned a fixed ipv4 address to a client. host h1{ hardware ethernet 11:22:33:44:55:66; fixed-address 192.0.2.2; } range 192.0.2....
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How can I check my PXE-server configuration

Is it possible to check the things the dhcp-server delivers? When I configure my dhcp-server I tell it what file to boot from, ex: pxelinux.0, and where it should find it, ex: 192.168.0.112. Could I ...
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OpenVPN clients getting DHCP lease from external server, despite server-bridge used with an DHCP pool

I have an OpenVPN sever and several clients. My issue is that although I specify a pool for DHCP leases with server-bridge, my clients get a lease from that, but then eventually (after some minutes to ...
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client not logged to local domain controller

I have a setup of Active Directory 1 DC with 4 RODCs A is my main DC. B,C,D,E are RODCs in different Branches. But When I checked from client pc the "logon server" is showing different location DC....
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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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hostapd push dns server address

I've created a hotspot with a VPN connection with openvpn. I have a DNS server with a public IP address. How can I add the IP address of my DNS server to my hostapd hotspot to the users to get all ...
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Different local domain per dhcp zone in dnsmasq

I'm testing an installation of dnsmasq on Ubuntu with two separate DHCP ranges that get assigned based on the mac address of the device. ... dhcp-range=10.1.0.100,10.1.0.200,12h dhcp-range=net:iot,10....
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Switch seems to be allowing only one device

I have a simple 5 port switch which I recently connected to the ethernet jack in my office. There is a main cisco switch for the entire office lan. Anyway all my devices were connected, I could check ...
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Internet drops on Ubuntu ISC-DHCP-Client networking

i am having issues with the network connectivity on Ubuntu server 16.04. I am connected to Verizon Fios via Ethernet (it's defined as dhcp on the /etc/network/interfaces file.) The DHCP Client that I ...
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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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single scope Linux DHCP with Microsoft DHCP failover and load balancing

Is it possible to run a Linux DHCP server along side a Microsoft DHCP that can be load balanced with failover? I know you can split the scope but wondering if it possible in a single scope.
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How to route a file to specific gateway?

I have Windows 8.1 Enterprise I am connected to two internet connections on my PC with this gateways: 192.168.1.1 = my isp gateway 192.168.43.1 = my mobile usb tethering gateway Now I want ...
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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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