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Questions tagged [dhcp-server]

Dynamic Host Configuration Protocol (DHCP)

The DHCP service is a client/server application that allows "clients" to obtain configuration information (typically for network settings) from a "server".

Questions carrying this tag should focus on the server-side more than the client-side.

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Reserve IP based on DHCP Option 61 insted of MAC Address

a DHCP client is sending a discovery packet with option 61. Now the Windows server 2019 /2022 needs to respond with the offer based on the DHCP reservation, reservation is registered based on option 61 value. However Serve is not generating offers…
Abel K.Bil
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Windows DHCP IOT retain same IP

I am trying to address a problem. We have a windows DHCP server and some devices, which we need to replace on needs. The device has a custom DHCP client which sends DHCP-DISCOVERY Packet with additional vendor-specific unique information,(It is…
Abel K.Bil
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Centos 7 dhcp server not responding to UEFI PXE DISCOVER

I'm trying to set up a Centos 7 server as a dhcp server for PXE (UEFI). I'be tried several changes to the dhcpd.conf file, but nothing seems to make a difference. dhcpd.conf: allow booting; allow bootp; max-lease-time 120; default-lease-time…
Justin Killen
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DHCP load balancing added to production and existing clients

I have to ask something I cannot find explained in e.g. https://learn.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2012-r2-and-2012/dn338976(v=ws.11) (refers to 2012R2, but that should not matter, my Google-fu failed me) We…
Hagen von Eitzen
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Migration strategy to migrate a DHCP scope from old DHCP server to new DHCP server as smooth as possible

My current homeLab and entire home is currently running on a single subnet 192.168.0.0/24 with my ISP provided router running a DHCP scope handing out addresses in the 192.168.0.20-192.168.0.254 range, and a number of hosts with static IP addresses…
Simon Kepp Nielsen
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MACs in DHCP reservation are changing randomly

For the second or third time now our dhcp server forgot parts of its reservations and made up random MAC addresses. Why? We have 2 dhcp servers in failover mode. Everything worked well for years. But now out of the blue after installing some windows…
T-Me
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Force sending DHCP options

I have a lab spectrometer that boots using PXE from boot files stored on a computer. They exist inside a local network with the computer acting as both the DHCP and TFTP server. The spectrometer contains three components, two boot fine and one is…
HKaras
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Setting up LAN gateway for school club network - "No subnet declaration for enp3s0"

I am a computing teacher, I am trying to setup a "sandbox" network with internet access for an after school computing club. I have an old PC (Debian 11 installation) with 2 ethernet interfaces, one interface is connected to the standard school…
ICT Teacher
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Static DHCP reservation via ASDM

We have a Win 2016 server in a datacenter behind a Cisco ASA 5515 running 9.8(4)29. I use ASDM 7.12(2) to manage it. I am very familiar with networking, but rather a novice with Cisco command line configuration. We have always used we interfaces to…
Jerry Welliver
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DHCP logs showing (no free leases)

I have setup new isc-dhcp-server in ubuntu 20.04. all client getting connect but showing there logs (no free leases) client connected only 25 machine. sudo tail -f /var/log/syslog Sep 9 09:43:57 ggn-dhcp-srv dhcpd[49319]: DHCPDISCOVER from…
Aslam Raza
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Decode UID from dhcpd.leases

I have am testing a device on my network which has this lease assigned: lease 192.168.110.85 { starts 3 2022/07/20 16:12:37; ends 3 2022/07/20 16:22:37; cltt 3 2022/07/20 16:12:37; binding state active; next binding state free; rewind…
Johannes Linkels
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dhcp: lease expiration vs. infinite lease

As per RFC2131, when the lease expires the client has to stop using the IP address. So do I understand right that if the lease lifetime is set to infinite on the server, then the client does not need to renew/rebind its IP, and thus the server does…
Mark
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How to set up OpenVpn client on the Mikrotik for two different PCs with the same credencials for vpn?

I set up OpenVpn client on the router Mikrotik, but for some sites have ERR_NAME_NOT_RESOLVED. I am using OpenVpn on Ubuntu, but I need to use the same credentials for VPN on two different PCs, when I enabled VPN on both, it works only on one. So I…
QSA
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isc-dhcp-server ip-range speicifc domain-name-server

I'm trying to get an isc-dhcp-server configuration to use different DNS-Servers based on the ip-address assigned. Basically, I want some of my client marked as not-trusted, which then may not access services using the internal url. I tried using…
Poehli
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Migrating Old Active directory Forest with two domains

We have single AD forest with two domains as follows: Domain A: Contains nearly 30 servers (7 physicals and 23 VMs) all hosted on Microsoft Hyper-V server Nearly 500 Active user accounts A huge file server with 3 TB active data on nearly 4000 share…
John Rese
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