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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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modify dhcpd.conf via script to convert whole subnet to DHCP reservations

We have a hodgepodge of systems that are either static IP addresses, or DHCP reservations. (We don't hand out any addresses except reserved ones). Some servers have multiple Nics, and ILO cards. Its getting annoying to have to scan the subnet to…
Brian
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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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DHCP server does not provide correct filename for PXE

I'm trying to configure PXE server for both Legacy/UEFI support. So I need to provide different bootloaders based on architecture of machine. Here's part of dhcpd.conf: option architecture-type code 93 = unsigned integer 16 ; next-server…
SibVal
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No subnet declaration for WAN

I have 2 netcards enp0s3 for WAN and enp0s8 for LAN. WAN has dynamic IP address (received from ISP). LAN has class C static IP address for my local network I have isc-dhcp-server with this config: nano /etc/dhcp/dhcpd.conf # ISC-DHCP-Server…
acgbox
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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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Unable to add forward map SERVFAIL/REFUSED DDNS

I am using bind9 on a primary dns server with two secondary dns servers in a master/slave relationship. I am attempting to implement DDNS but seem to be running into a problem when it comes to adding a forward map, I get the error Unable to add…
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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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