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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Two different sites with one domain

This the scenario I have two sites The sites are connected together by a P2P wireless connection Windows Servers 2012 on both sites acts as a domain controller. We have one domain for both DHCP ...
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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, ...
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Load Balancing ISC DHCP Servers Issuing Multiple Offers to Client

According to section 6 of RFC 3074, it seems that the process for selecting a load balancing server in ISC DHCP is as follows: The client broadcasts a discover message, which either directly reaches ...
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RFC 3074 DHCP Load Balancing STID vs RFC 2131 DHCP xid

Section 2.2 of RFC 3074 defines a Service Transaction ID (STID) as: An attribute of the individual client requests used for load-balancing. However, section 2 of RFC 2131 defines the xid field of a ...
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Raspberry Pi 1 WiFi adapter receives 2 dhcp addresses

I have a raspberry pi 1 with a USB WiFi adapter. The wlan0 interface has 2 IP Addresses and i dont know why: pi@smart-meter:~ $ ip a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state ...
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Debian server network connection keeps dropping

Background I'm working on an internal server running Debian Uname - r output : Linux osteocalcine 5.10.0-13-amd64 #1 SMP Debian 5.10.106-1 (2022-03-17) x86_64 GNU/Linux This server (which is planned ...
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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 ...
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dnsmasq - failed to bind DHCP server socket: Address already in use - DHCP proxy

I have some issue with dnsmasq. I'm trying to use the existing dhcp that is provide by my router to create a pxe server but dnsmasq give me an errror. /etc/dnsmasq.conf : port=0 log-dhcp dhcp-range=...
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Two DHCP, One PXE

I am trying to figure how to build a specific topology in our servers, but mostly I want help on theoretical level. I understand that you can have 2 DHCP servers on a same network as long as they have ...
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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 ...
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dnsmasq: Change DHCP range based on group of MAC address

Is it possible to change the DHCP range dnsmasq gives out based on the MAC address block. For example, I want all MACs in the block 00:0C:29 to have a different DHCP range compared to every device on ...
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DHCP pushed route to custom table on Linux

Is there a way I can direct routes that I receive from DHCP to a specific routing table depending on what interface it was received on? E.g. eth0 and eth1 are both configured by DHCP. I would like the ...
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DHCP Server Not Registering PTR Records - Multiple DHCP Servers

I have a DHCP server configured to always dynamically update DNS records. The DNS server is configured to allow both secure and insecure updates (I know it's not secure, but this is an internal-only ...
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ISC DHCP for relay agents

I would like to configure DHCP server for my networks, but in the same time, i don't want to setup dhcp server on the network where the server itself is. DHCPD insist to configure subnet declaration ...
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Windows DHCP Server does not give correct IP

I have a Windows DHCP Server with many scopes, each one related with a VLAN, and I have a PC connected to a switchport. Then, I am changing the access VLAN on this switchport to see if the PC receives ...
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Distribute IPs from DHCP server in host network to docker containers

I am running several services in docker containers for my homelab, and I need them to be accessible from their own distinct IPs. My host system is running debian "bullseye". From the docker ...
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Migrating DHCP clients to new subnet using DHCP superscope?

I am migrating our dynamically addressed DHCP clients to a new subnet due to requirements coming from the higher ups. I am thinking of doing it like so: 1. Create new scope on DHCP server (Server 2019 ...
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Make static hostname visible via DNS (and dynamic IP)

In my local network I manage a csv file which maps MAC addresses to hostnames. This file is used to set the hostname of a client machine when it gets installed, so dynamic hostname assignment is not ...
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Obtaining two DHCP addresses on Linux

There have been various questions asked a long time ago about obtaining two IP addresses via DHCP on Linux. Most of those are still relating to old 'alias interfaces', like eth0:0, which has been ...
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Hide IP with softether client in ubuntu - no response from DHCP

I have setup Softether VPN server on my OVH VPS with this tutorial. When I'm connecting from my windows machine everything works fine and the internet sees me by my VPN servers IP instead of mine. Now ...
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DNSmasq: Assign address names to dhcp range

I'm currently assigning static host records in dnsmasq like this: host-record=test.example.com,192.168.1.1 dhcp-host=56:54:53:52:51:03,192.168.1.1,8h However i'd like to give my dynamically assigned ...
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DHCP server IP reservation during the "offer" step

How long the IP is reserved by the DHCP server when it sends the offer message. Image the client does not send back the request message, after how much time the IP is again available? Thanks for your ...
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"centos dhcpd server include external file" failed

this is /etc/dhcp/dhcpd.conf allow booting; allow bootp; ignore client-updates; set vendorclass = option vendor-class-identifier; include /etc/dhcpd-reservations.conf; /etc/dhcpd-reservations.conf ...
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How can I tell my Ubuntu 20.04 is running dhcp client?

I have a system that runs Ubuntu 20.04. However, it doesn't seem to be set as a DHCP client. song@docker:~$ ps -ef | grep dhcp song 7861 3124 0 08:50 pts/0 00:00:00 grep --color=auto ...
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up directive not working when dhcp is selected in /etc/network/interfaces.d/eth0

I have to add the multicast route, that is needed when no default gateway is configured. Mono needs this in order to join multicast groups. The configuring is done in /etc/network/interfaces.d/eth0 ...
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DHCP server not dynamic updating DNS across multiple domains

I am in the process of migrating from an old single label domain to to a new domain on a new server. I have just switched over to the DHCP server on the new domain however, computers still on the old ...
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DHCP Kea High Availability over TLS doesn't work

I have installed 2 Kea 2.0.1 Servers in Debian 10 Buster virtual machine in Virtual Box 6.1.26 r145957 (Qt5.6.2) and also in VMware Workstation Player 16.1.2 build-17966106.The high availability ...
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DNSMASQ DHCP with Multiple VLANS --- How to identify the originating VLAN?

I'm curious as to what best practice would be when serving DHCP to multiple VLANs from a single DNSMASQ instance. (The DNSMASQ server is a KVM guest.) Do I: A: Create a virtual NIC on the DNSMASQ ...
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Hyper-V default switch to private profile

The organization I work for has a group policy that doesn't allow me to add firewall rules on the public profile. As a result, it drops DHCP requests from VMs as the Hyper-V default network seems to ...
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Force DHCP client to use only IPv4

I have Linux client (running systemd-networkd, version 244), and I want to configure it's network only with IPv4. However, the DHCP server offers both v4 and v6. Is it possible to limit the client to ...
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Using DHCP reservations instead of static IP address configuration for servers

I was wondering if it is better to use DHCP reservations for servers and computers that must have static IP address, excluding DHCP servers themselves, Domain Controllers, and DNS servers of course, ...
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DHCP: When (which step of DORA) do options get sent?

Everyone knows that there are 4 steps to a DHCP handshake. Everyone talks about DORA (Discover, Offer, Request, Ack) and the "happy path" to getting an address, and this is the most common ...
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SuperMicro PXE Boot through PCI NIC

ServerFault. I am facing an issue booting through PXE on a SuperMicro server. The NIC that is supposed to boot through PXE is an Intel 10GE 82599ES SFI/SFP+, One server works well. But other servers ...
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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 ...
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static bindings in DHCP server

I'd like to enable static binding in the DHCP server (I'm using KEA Dhcp https://www.isc.org/kea) but I think it is applicable to other implementations as well. What exactly I want to achieve is to ...
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dnsmasq DHCP not working, not replying to DHCP requests

I have setup dnsmasq as DHCP server on a CentOS VM, however it is not replying to DHCP requests. What could be the issue? Following is the configuration and tcpdump logs. interface=ens224 listen-...
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how to log the MAC addresses of devices acquiring an IP address through DHCP (Windows server 2022)

My network serves DHCP through a Windows 2022 server. I would like to log the MAC addresses of all devices that acquire an IP address through this DHCP server. I have installed the IPAM role in the ...
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Can't start isc-dhcp-server due to error " AgentInitCheck: agent comms failure"

I have a Raspberry Pi 4 - Model B, and I'm trying to create an adapter from Wi-Fi to Ethernet using the Pi. I'm currently using this gist as a guide for how to create it, but I keep running into an ...
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Linux, how to ask DHCP to assign a specific IP address

I've recently purchased a tiny PC, on which I want to install Proxmox VE. Currently I don't have any access to my landlord's router, therefore I don't know how big current DHCP pool is (and if there'...
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exporting the DHCP and DNS configuration of a Windows2022 server [duplicate]

Is there a way of exporting the complete DHCP and DNS configuration of a Windows2022 server, such that it can be migrated painlessly and installed 1:1 onto another server? I mean, not only Zones, A-...
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My DHCP client server (CentOS) cant get IP from DHCP server (Ubuntu)

Good day kindly i have set up my DHCP server ( ubuntu Server) to provide IP for servers as client but the client is getting another IP out of submitted rang IP and i can't find any symptom in this ...
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ddns update multiple zones in a single lan from dhcp server

I am trying to make the following setup to work but i'm failing : A isc-dhcp server (debian) to update a bind9 server (debian). The bind server has 2 zones: dev.toto and prod.toto, all servers (...
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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 ...
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Identifying current main DHCP server

There are two DHCP server of the same IP address example.(10.100.9.12 and 10.100.9.13). The gateway, subnet mask, and DNS is the same. The current DHCP are running on Vlan9. Is there any possible way ...
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Windows DHCP not showing the accurate leases

In Windows System Event log, there are DHCP server warnings that IP address range of a scope (10.40.0.0) that available is low. Windows Event Log But in the DHCP program, the Address Leases is only ...
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DHCP NTP Server Option 042 not propagated by Windows Server 2016

I am trying to make NTP server settings available to our non-Microsoft devices on local wired and wireless network. Obviously, they don't know how to use MS AD time info from domain controller. Our ...
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configure dnsmasq to give out addresses in different ranges

I'd like to give unknown clients an ip address in one range and known clients in another (that is a static one). I tried quite a lot now and don't seem to get it working. All I get is an "no ...
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on hotspot running openvpn how to share obtained dhcp-option DNS?

There is linux box being a hotspot for number of devices. It also runs openvpn client which is supposed to be shared with connected hotspot clients. Openvpn receives PUSH_REPLY dhcp-option DNS x.x.x.x ...
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Setting up dnsmasq as a DNS and DHCP server on a LAN

My routers: Main Router: 192.168.100.1 Second Router: 192.168.101.1 The Main Router is provided by my ISP(a modem/router combo all in one). I don't have control over its settings. Except for ...
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Windows Server 2016 DHCP Issue (Reserved IPs, Static & DHCP)

I've got a problem thats driving me nuts now. I've got my DHCP server set up to provide addresses over a number of different VLANs. On the main Processing VLAN the lease time is set to 15 mins, after ...
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