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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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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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Statically assigned leases in ISC DHCP server are not added to DDNS

I have a gateway running both isc-dhcp-server and bind9 on Debian. Hosts that are assigned IP addresses in the DHCP range are added to the DNS zone; however, devices that I assign a static lease on the DHCP server are not added to the zone. I looked…
phaedrusschmaedrus
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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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ISC DHCP server assigns reserved IP addresses incorrectly via reuse for the wrong MAC

DHCP clients that want to renew their lease with a reserved IP get a DHCPACK although the MAC address does not match. It made no difference where the host definition was located. outside the " subnet " definition inside the " subnet "…
Eamon
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ISC DHCP Server - Matching client identifier won't work for single device

I hope someone can help me with this problem. What am I trying to do I want to provide information to a Cisco ASR1k depending on its serial number. Reason for this is I don't have any MAC address of the device. Only the serial number of the chassie…
yabberth
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How to supply hostname using isc-dhcp-server to hosts without fixed-address

I have a DHCP+DNS setup on my network using bind9 and isc-dhcp-server. It works fine for all clients that have a "proper" hostname configured without any special setup in dhcpd.conf in the server. There are also a couple of hosts I have setup with…
xxDMxx
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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 the DHCP servers in active-active state, or which…
vpseg
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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 for the network of the ens192 interface (which i…
Michal Žila
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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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Simple stateful DHCPv6 using ISC DHCP and RADVD. Doesnt work?

I'm trying to set a simple ipv6 network using ISC DHCPv6 on a linux machine. Here is my dhcpd6.conf: subnet6 beef:fade::/112 { max-lease-time 3600; range6 beef:fade::100 beef:fade::fffe; } The dhcpv6 server works and assigns addresses to…
carloslockward
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Ubuntu 20.04 false subnet per interface isc-dhcp-server

This morning I have configure my interfaces network: version: 2 renderer: networkd ethernets: ens160: dhcpd4: true nameservers: addresses: [8.8.8.8,8.8.4.4] ens192: dhcpd4: false …
Dr. Memory
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