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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DHCP not working for bridged QEMU virtual machine

Environment: A router with DHCP server. This router manages a subnet of 172.16.0.1/16 A host with Ubuntu 20.04 installed, and it has a NIC named eno0. A QEMU virtual machine running on host. Purpose:...
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Can I get ip lease from DHCP router for linux virtual interface?

I have a mikrotik router that acts as a DHCP server. I created some virtual interface on my raspberry pi using : interface eth0:1 static ip_address=192.168.88.5/24 static routers=192.168.88.1 static ...
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Having static IP allocated, still have to use DHCP, otherwise it does not work. Why?

I have a static IP address allocated by my Internet provider. However, support told me I have to use DHCP on my network interface, otherwise it may not work (and it actually does only work with DHCP). ...
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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 ...
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Fresh Ubuntu 20 server getting wrong DHCP address

I need to setup a new Linux server on VirtualBox, I'm using Ubuntu Server 20.04 LTS and in Virtualbox my network adapter is set to bridge adapter with promiscuous mode on "allow all" First ...
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Static Addresses On DHCP Range

I have DHCP server setup on my network. I have set of computers that need to remain on and based on their work if the upstream network goes out it needs to remain on with the correct addresses. In the ...
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How to get custom option on client from ISC DHCP server

Over ISC-DHCP server I wanted to define a custom DHCP Option, for which I am using below config option imagefile code 224 = ip-address; subnet 192.168.29.0 netmask 255.255.255.0 { range 192.168.29.1 ...
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DHCP collision on two subnets in same domain

I'm trying a VLSM scenario with my 2 consumer routers. R1 has GE and R2 has FE. Both has internal switch (br0) since they are home routers. First simplify things with fixed masks. R1 on 192.168.1.1/25 ...
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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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different DHCP behavior between machines using NetworkManager and not using NetworkManager

can anyone please shed some light on the differences I list below. And maybe explain why NetworkManager does it differently. And please advise if we can change NetworkManager to behave more like the ...
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What is the difference between a 'host' entry and a 'lease' entry in dhcpd.leases?

In the managed file dhcpd.leases, our lifecycle management application adds a host h1.example.com { ... } entry when building a virtual-machine from the application. However, already built machines ...
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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"...
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Configuring multiple DHCP address pools between two Cisco 2960 switches

I have two Cisco 2960 switches, connected by a trunk, with all ports on VLAN1. I've setup one switch to have DHCP Server Port-Based Address Allocation, such that a client connected to port X always ...
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Connecting DHCP embedded device to Windows 10 PC using Ethernet cable

I have a custom embedded Linux device that I need to connect to using SSH for work. This device uses DHCP to get its own IP from the network (using an Ethernet cable). I used to use a router in ...
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Wireless clients connected to the repeater not getting IP addresses from the DHCP server

I have a Mikrotik wifi router and an Asus wifi router configured as wireless repeater connected to the Mikrotik. The connection between Mikrotik and Asus is through wifi. Asus is getting IP address ...
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Isc-dhcpd using includes in subnets

Trying to move some commands to includes. Putting it directly on the config works Is there any way to accomplish this? I have subnets with the same information over and over again. Errors: /opt/dhcpd/...
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DHCP server provides multiple routers - why some clients don't use them all?

In a LAN of ~100 hosts we have a DHCP server (ISC DHCP), and we have two LAN-WAN gateways (in the same subnet) to provide redundancy in case one gateway fails. DHCP server is configured to provide ...
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Why is ISC DHCP server ignoring the fixed-address statement?

I want for the devices which belong to different VLANs to have different routers. For instance: The device 10.0.10.84 inside a VLAN 10.0.10.0/24 would have its router set to 10.0.10.1, whereas: The ...
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DHCP searching wrong network

I have a stand-alone device with no console. It's searching for DHCP address on 192.168.1.1/24 while my network router serves DHCP for 192.168.0.1/24. Thus, the device is not getting assigned an IP ...
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DHCP conf syntax

can someone help me figure out what the syntax issue is here. This block works in RHEL6 dhcpd.conf (dhcp-4.1.1-63.P1.el6_10.x86_64) file but is throwing an error when I am upgrading to RHEL7 (dhcp-4.2....
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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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DHCP Server - Unable to share Internet to clients

note: I will call the server running isc-dhcp-server "DHCP-SERVER", and computer wired to my switch "DHCP-Clients" Hi, I am currently setting-up a network, and i am unable to share ...
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182 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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How do VPNs block DNS queries to other interfaces?

I'm trying to understand how DNS routing works with/without a vpn. I have the following interface. Wireless LAN adapter Wi-Fi: DNS Servers . . . . . . . . . . . : 192.168.40.1 nslookup on this ...
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Client is sending 'udp port 68 unreachable' in response to DHCP ACK - why?

Please help me understand the following DHCP traffic. I've put my comments below each packet: 15:49:52.968450 d8:0b:9a:15:27:ec > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length 590: (tos 0x0, ...
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AWS multi account private DNS setup always fails with SERVFAIL reply

I (try to) follow this guide to setup DNS resolution through multiple AWS accounts using private Route53 zones. I have done: setup central and participating account create inbound/outbound Resolver ...
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Create a static Hyper-V NAT with DHCP

I like to create a NAT for Hyper-V with DHCP. The Default Switch resets the IP after restart which annoys me. So I'm on a mission to create with fixed IP. I followed this tutorial: https://docs....
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How to forward all traffic and IP addresses

I want to build a system that allows me to have "floating IPs". To do this, I want to have a single server with 5 IP addresses. It then relays that traffic to another machine (or more) ...
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Is it possible to have both static and dynamic IPv6 addresses on one interface?

I have two Qemu virtual machines with Ubuntu Server. I would like one of them to be a DHCP server. On the second one, I would like to have two IPv6 addresses. One should be static, and the other one ...
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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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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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2 servers show different behavior when DHCP sever goes down

i dont have any control of the DHCP servers on my network and every 2 weeks or so there is an outage of a few hours where my CentOS 7.8 servers do not get responses to DHCP renewal requests. As far as ...
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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,...
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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 ...
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PXE boot does nothing after NBP download

When client machine boots it succesfully downloads NBP file, next there is Windows Deployment Services (Server IP: 192.168.240.250) Contacting server ( 192.168.240.250): / And thats it, after a while ...
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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 ...
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DHCP Server stops handing out leases

I currently have a DC running Windows Sever 2008 R2 (yes I know) and for the past two weeks, when employees travel back to the office, they can't connect to the internet unless I do one of two things. ...
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Configuring Hyper-V on Windows 10 for pass-through DHCP

I've created a windows Hyper-V VM on a Windows 10 (X64) 2004 Pro host. I'm using the Hyper-V manager console, and the VM is working fine and has internet connectivity when using the default switch. I'...
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dnsmasq dhcp ignoring dhcp-host definitions

I am currently puzzled by the dnsmasq configuration, and I hope someone here can help me... I've setup successfully the DHCP-Server with dnsmasq, and I've tried to include some static Host ...
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Virtual environment DHCP networking/Sharing internet access

I'm an IT student, currently studying network, and I need to setup a virtual network environment. I am using VMware version 16.0.0 I have 3 VMs, all running Debian 10 Buster. VM1 should be the DHCP ...
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Opening up an local network with DHCP whith own IP-segment

I initially thought, that this is a very basic task, but somehow I faced some Issues. I have an TP-Link Access Point that is connected with a static IP in an existing network at adress 192.168.225.185....
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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 ...
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Turris Omnia Router and VLAN with DHCP

We have been trying to achieve this task for a week now, and this forum post is kind of my last hope… Since I am pretty new to networking as a coder it might seem like an easy to answer question but ...
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Running dnsmasq as a DHCP proxy from a container

I'm trying to configure dnsmasq to operate in DHCP proxy mode, supplying PXE network boot information to clients, while my router continues to act as the DHCP server. Ideally, I'd like to run dnsmasq ...
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Can Azure DHCP service be disabled?

I want to control a DHCP service from a VM with dedicated network interface. (install the DHCP role) I can't find where to turn of azure native dhcp off, anyone know how to do that? Thanks.
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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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Is there a command to renew dhcp lease for ipmi?

I have updated config of my dhcp server, so that server should get a new ipmi address. But the server stay at its old address for some time. If I do not want to wait, I want to go to the server and ...
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Several redundant automatic entries for all DHCP client machine host names in Samba 4 AD DC DNS

We have a Samba 4 AD DC installation wich is also the DNS in our network. It collects entries of all DHCP client machines with their addresses automatically. I can remember to have activated this ...
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Should I assign my VPN a static IP or use a DHCP reservation?

I'm setting up a Raspberry Pi with OpenVPN on my home network. The router for my network is a NetGear Orbi. In the router's configuration I'm able to assign a static internal IP address (say 10.0.1....
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Delegate delegated ipv6-net to another server

i am trying to set up ipv6 for our internal net, so i configured our public ipv6 net for our dmz at first. Every host in the dmz has its own public ipv6-address now. Since i have a 2-tier-firewall, i ...

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