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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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DHCP Pools on Ubuntu DHCP server not working properly

Mac addresses ending with "55:a3" and "56:2a" are also ending up in last pool 123 match if binary-to-ascii(16,8,":",substring(hardware, 5, 6)) = "55:a3"; …
Anand Bajpai
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dhcpd server invalid mac detection

On my dhcp configuration, i have on commit hook to save device information. My problem is some of the mac addresses becomes invalid: 8:7c:39:cf:b6:3f - this should start with zero 8:d0:b7:52:f9:68 - also this my dhcpd.conf set clientmac =…
hodl
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isc-dhcp-server can't get DHCPDISCOVER packet from some clients whose MAC address not in the subnet

isc-dhcp-server running normal, it can offer IP address to most clients in all subnet which are defined in the dhcpd.conf file, but it can't receive some DHCPDISCOVER packet from several clients which also in the same define subnet without the…
VictorLee
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Define multiple filename options in DHCP config based on different range

Intro I am trying to use a centos box for DHCP and TFTP function, for iPXE boot. I have one subnet configured for DHCP, but it has multiple ranges and each range has a different iPXE boot URL. Problem Problem is that once the hosts boot into iPXE,…
Virtual Cloud
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Cannot ping anything on intranet or internet when connected to second subnet in isc-dhcp-server

On my local network, I've got Ubuntu Server running isc-dhcp-server and named. I have a lot of devices that I've assigned static addresses to, and up until now have assigned a small range of IP addresses for unknown devices. This was on a single…
Jeremy Wilson
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Server DHCPv6 with Linux Alpine

I want create a server dhcp6 with alpine I'm using Kea-dhcp6. The my file config this is: { # DHCPv6 configuration starts on the next line "Dhcp6": { # First we set up global values "valid-lifetime": 4000, "renew-timer": 1000, …
Seguret
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Windows AD not updating Linux DDNS in hybrid integration

I am setting up a Windows AD server, with a Linux DDNS setup. The Linux DDNS runs perfectly fine as expected. However, when I try to add the AD role to the Windows Enterprise 2019 server, the role installs as expected but it does not update the…
lb-99
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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 192.168.29.1 192.168.29.244; option imagefile…
Ruchir Bharadwaj
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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... root@sinj:/home/brlight# cat…
Eduardo Lucio
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Block the DHCP server from broadcasting into the second ethernet interface

I have setup my DHCP server by following the instructions in https://wiki.debian.org/DHCP_Server. This all works but the issue I am having is the DHCP server is being broadcast in the main company network. How would I stop the DHCP server from…
Paul
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Can isc-dhcpd be configured to remove DNS records when leases expire?

I've configured my dhcp server so it can successfully add records to a private DNS zone when it issues a lease for a client. I never see it removing a lease however. Is it supposed to do so or is there some configuration param I should be setting to…
pnadeau
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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 device 10.0.11.6 belonging to 10.0.11.0/24 should…
Arseni Mourzenko
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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 internet over the DHCP clients. I am also using isc-dhcp-server My…
user3503112
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isc-dhcp-server (dhcpd) gives old next-server in DHCP offer

I'm running isc-dhcp-server (dhpcd) version 4.4.1 on ubuntu 20.04 with a subnet configured like so, which has been working just fine. # /etc/dhcp/dhcpd.conf subnet 10.0.1.0 netmask 255.255.255.0 { option routers 10.0.1.1; next-server 10.0.1.2; …
timss
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ISC DHCP server - append "01" to the end of Option 43

My current Option 43 generates this hex value in DHCP Offer. See my current configuration below. f2080a0a0a0a0a141414 I need to add "01" at its very end and increase length from "08" to "09". The final hex should look like…
Jiri Brejcha
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