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Questions tagged [isc-dhcp]

ISC DHCP is open source software that implements the Dynamic Host Configuration Protocols for connection to a local network. It is a reference implementation of those protocols, but it is also production-grade software, suitable for use in high-volume and high-reliability applications. DHCP is available for free download under the terms of the ISC License, a BSD style license.

ISC DHCP is open source software that implements the Dynamic Host Configuration Protocols for connection to a local network. It is a reference implementation of those protocols, but it is also production-grade software, suitable for use in high-volume and high-reliability applications. DHCP is available for free download under the terms of the ISC License, a BSD style license.

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Replies to request coming over a relay goes to relay's internal IP, not to original request's source IP

Dhcpd running on Linux gets a dhcp request over dhcrelay which is running on other remote machine. Oct 6 10:09:46 2012 dhcpd: DHCPDISCOVER from 00:1e:68:06:eb:37 (oguz-U300) via 172.16.17.81 tcpdump: listening on eth1, link-type EN10MB (Ethernet),…
seaquest
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isc dhcpd: how to insert option 61 (client id) into dhcpoffer

I have a quick question. Is it possible to make ISC dhcpd server insert the option 61 (client id) in DHCPOFFER, in case if it is present in DHCPDISCOVER? The ISC dhcpd version I'm using is dhcp-4.1.1 (dhcp-4.1.1-12.P1.el6_0.4.x86_64 CentOS…
facha
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Force windows 7 to update dns through dhcp server?

I have setup a new BIND9 to allow dynamic updates from my DHCP3 server. I am securing it using a DNSSEC key. Everything appears to work except when my windows workstation grabs an IP address it tries to update the dns records itself instead of going…
AtomicPorkchop
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Is it possible to make ISC dhcpd (IPv6) 4.2.2 unicast-only?

I ask because the server is handling DHCPv6 for two VLANs and I can see some requests both via DHCPv6-relay from our ProCurve switch and via the ff02::0:2 anycast address and responds to both requests. The logs look like this: Sep 23 00:40:05 fry…
Beau
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dhcpd, DISCOVER, "no free leases"

I am attempting to set up a VERY simple DHCP server. I am using Ubuntu 10.04, and I installed the "dhcp3-server" package. The server has one interface (eth0) statically set to 10.0.0.10(/21). I want to hand out IPs from the network 10.255.224.0/19.…
Cory J
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dhcpd won't let go of old leases

We have DHCP setup to hand out leases in the following range: 192.168.10.190 - 192.168.10.254 (roughly 65 leases) Our small business network only has about 30 computers that use DHCP. We noticed that dhcpd stopped handing out new dynamic leases to…
Jake Wilson
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Accessing DHCP Client's vendor-encapsulated-options

In the dhcpd.conf file for isc-dhcpd-V3.1.1, I have set up a vendor options space and defined several different options. I am able to use those definitions to send options from the server to the client in the vendor-encapsulated-options option…
Jason Owen
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ISC DHCP server web interface

I want to ask what web interface could be used for isc dhcp server on Ubuntu 22.04 server. I want to create dhcp server on ubuntu, I installed and configured isc dhcp but now i want to manage it from web ui(see statistics, clients, etc.). I found…
skoczo
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isc-dhcp-server "No subnet declaration for enP4p65s0"

TL;DR: I'm aiming at configuring my own Ubuntu 22.04LTS-based router for my home network, using isc-dhcp-server, nftables & NetworkManager. I'm experiencing weird DHCP behaviors. I'm using a Nano Pi R6S which has 3 ethernet interfaces : enP3p49s0 :…
Ben
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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 Vendor-encapsulated-options / how to create a group option?

I am trying to use VENDOR ENCAPSULATED OPTIONS in order to have a name in front of my DHCP parameters. It works for one option, but for a group I don't get how to do it with the isc-dhcpd. Any help ?
fransua
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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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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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isc-dhcpd: lease file with numbered suffix

I have a lease file named dhcpd.leases.1665158894 in the same directory as my dhcpd.leases file. Full directory listing: dhcpd.leases dhcpd.leases.1665158894 dhcpd.leases~ What is this file? Can I delete it?
pnadeau
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Configure a DHCP server with isc that gives the clients IPs depending on the OS

The problem is that I cannot put a static IP or filter by mac because some clients have dual boot and use both Windows and Ubuntu, I need to be able to somehow distinguish between both OS and both with the same MAC address. How can I solve…
vicentG
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