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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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ISC DHCP - Force clients to get a new IP address, instead of the being re-issued their previous lease's IP

We are in the middle of a migration of our DHCP and DNS services from a Debian-based server to a Windows Server 2008 R2 implementation. The Debian server is running isc-dhcpd-V3.1.1. All of workstations are configured to have fixed-addresses between…
user62491
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why would dhcp listen port 80

I have a CentOS server with isc dhcpd and apache 2 webserver running. A couple of minutes ago I have tried to restart apache: /etc/init.d/httpd restart Restart has failed with: Starting httpd: (98)Address already in use: make_sock: could not bind…
facha
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Audit reserved IPs for UNIX/Linux ISC-DHCP

Are there any good FOSS tools to do an audit of reserved IPs used in a Linux/UNIX ISC DHCPd environment? I'm trying to ensure that we do not have stale IP addresses reserved when old MAC addresses are pulled.
keithosu
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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 DHCP packet as: Transaction ID, a random number…
vpseg
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What is the proper way to back up ISC DHCPd lease files?

According to this answer, DHCPd lease files are cleared every hour. The goal is to back up the leases file continuously, so there is never a lease lost. This is made difficult since it is unclear whether the hour timer is based on system time (eg…
vpseg
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isc-dhcp-server assigns same IP address for different hosts

I have an isc-dhcp-server running in a Docker container, which I configured with one subnet of 100 available IP @. When starting my laptops (they are all running Linux OS), when they are requesting IP@, they are all offered with the same one by the…
Bruno
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What is the exact meaning of "On Commit" in ISC DHCP server configuration?

I know there are three kinds of events we can use for scripting in ISC dhcpd -- commit, expire and lease. My problem is, I am having a little problem in understanding the "commit" event. I know "commit" event means when the server has made a…
Elon20
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how to load grub with menu in ipxe setup

I am trying to setup an ipxe environment on a vmware. I would like to configure the setup with UEFI. I have setup a ubuntu-server and configured it as pxe-server. via downloading ipxe, isc-dhcpd, tftp-hpa and ngnix. The dhcp isc-dhcp.conf looks…
Ruchir Bharadwaj
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how does isc-dhcp-server start on debian 10 with systemd

I'm on a beaglebone black running a debian 10 console image. A bit of an odd setup that I have, but I need to make it run that way. The issue: isc-dhcp-server fails to start at boot, but does start afterwards starting it by hand, typing : #systemctl…
Juergen Gnoss
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isc-dhcp dhclient request address endless loop

when a Linux Mint 20 virtualbox VM requests the network config to the home LAN router DHCP through isc-dhcp client with the stock /etc/dhcp/dhclient.conf config file everything runs fine: (BTW 192.168.0.1 is the main router - Sercomm H500-s - with…
peris
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isc-dhcp-server: Using option dhcp-client-identifier in host declaration to identify a client

I'm using isc-dhcp-server version 4.3 (isc-dhcpd-4.3.5) as a DHCP server for my local IPv4 LAN and I'm trying to configure it to use the option dhcp-client-identifier (DHCP option 61) in a host declaration in order to identify a DHCP client: host…
Tomek
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isc-dhcp-server fails if interface not connected on reboot

On Ubuntu 18.04 on my gateway server, I've installed and configured isc-dhcp-server, but it doesn't start up (i.e. it fails to start) if there's nothing connected to enp2s0 after a reboot. Note it says "Not configured to listen on any…
Sean McCarthy
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Replay DHCPDECLINE to host by edit ethernet address in dhcpd

I known in dhcpd.conf, I can use following config to assigned a fixed ipv4 address to a client. host h1{ hardware ethernet 11:22:33:44:55:66; fixed-address 192.0.2.2; } range 192.0.2.100 192.0.2.199; But what should I do if I just…
qin
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How to add more than 32 routes to isc-dhcp-server and separate them to 2 fields?

Is there any way to add long list routes to server? Actually now I can add only 32 routes because we have only 1 octet for them. After adding more than 32 routes I received "Malformed packet" by Wireshark. But Iam sure that I can add more than 32…
Ain Mditrevi
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ISC-DHCPD & BIND9: Adjust hostname for BIND ddns registration

I am running isc-dhcpd-4.4.1 and BIND 9.11.6 daemons on FreeBSD 11.2 server for a small company. dhcpd serves a number of Windows stations (assigning them mostly static IP addresses), several special-purpose devices (getting static public IP…
George JL
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