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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 Server - logging the host name from incoming DHCPDISCOVER requests

in my setup ISC DHCPD 4.3.1 hands out ip addresses only to list of pre-defined hosts, whose mac <> ip association is explicitly entered in the config file. once in a while there'll be DHCP request coming from a host that is not listed in the config.…
pQd
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ISC-DHCP server doesn't share hostnames with failover peer

I'm running 2 boxes with isc-dhcp-server 4.2.4-7ubuntu12.8, and when one of them hands out a lease, it looks like this: lease 192.168.56.228 { starts 3 2017/03/29 02:17:31; ends 4 2018/03/29 02:17:31; tstp 4 2018/09/27 14:17:31; tsfp 4…
user7916
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Defining a new location for syslinux configuration files when setting up PXELinux

I am working on a mock up of a PXE server for the place I work. I am trying to put the image files and configuration file in places that keep things a little more organized. Even though my dhcpd.confspecifies the configuration options needed to tell…
ianc1215
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dhcp 'next-server' outside broadcast domain, without using ip helpers(aka dhcp relay)

Can you set a 'next-server' option in dhcp that is outside of the client's broadcast domain? I'm trying to pxe-boot from a server outside my client's network, using isc-dhcpd In my lab I see the next-server option get sent from the dhcp server to…
Party Time
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Configuring a DHCP server with authentication

I configured a DHCP server that runs on a Linux machine using the 'isc-dhcp-server' package. I would like to add some kind of authentication step. Both the clients and the server will keep some kind of token and when the client will ask for a new…
Liran
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Unknown network segment - isc-dhcp-server

My network is operated by Cisco Catalyst with several VLANs and one DHCP server. On the Catalyst, for each vlan is set ip address-helper with the IP of DHCP server. isc-dhcp-server on ubuntu 14.04 is used as DHCP server. I have several network…
user3337015
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ISC DHCPD class is not assigned

I'm trying to setup a boot server which only answers to devices which want to boot over the network. Depending on the boot rom, I need to deliver different boot images, the other settings are common. My current configuration (/etc/dhcp/dhcpd.conf)…
Daniel Alder
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Is it possible to set a dhcp option 77 value in vsphere as a config parameter so vNIC ROM (e1000/vmxnet3) uses it during PXE?

I'd like to set a dhcp option 77 string value in vsphere as a config parameter on a vm or vm template so that the vNIC ROM (e1000/vmxnet3) uses it during the DHCP part of PXE. My goal is to have PXE booting nodes self identify using a dhcp option 77…
Padge
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Remotely monitoring ISC DHCP Server with Nagios

I have a WAN and I'm trying to use Nagios to check that a DHCP server in a subnet not directly visible to the Nagios box is up and handing out IP addresses, and I've been unable to make this work. I have 3 places I can monitor DHCP from, but none…
davidgo
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configure a dhcp server to serve two different scope on the same subnet with multiple interfaces

Ok, so here I am with a pretty complicated problem on a Debian Wheezy server I have three interfaces : eth0, eth1 and wlan0 on a single server, eth0 will act as a gateway for eth1 and wlan0, I have a isc-dhcp-server on the server. I have an IP…
CheshireChild
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How to associate a DHCP pool or subnet with declarations for a class

I have the following working configuration for ISC DHCP server 4.1.1, which hands out fixed addresses to registered clients. Some of those clients are configured for PXE booting (for FAI and SCCM). # General declarations authoritative; option…
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Forcing clients to get new IP Address from DHCP Server

I am running a DHCP server on Debian Wheezy, with isc-dhcp-server. Because people were connecting unauthorized machines, my DHCP leases were running thin, and eventually, authorized machines could not connect to our network. So, I asked about…
Canadian Luke
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DHCPD does not allow filename option with a colon in it

For some reason, tftpboot does not work with a colon in filename parameter: group { filename "node7:linux/pxelinux.0"; host machine_7a { hardware ethernet 02:01:02:02:01:11; fixed-address 192.168.10.8; } host machine_7b { …
Amumu
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isc-dhcp leases file never cleaned

When running isc-dhcp the leases file seems to grow indefinitely (several hundred MB). If I restart the isc-dhcp service, the file shrinks to 1.5MB. How can I have isc-dhcp flush expired records periodically without restarting the full service?
Jon Skarpeteig
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How to manage gateway assignment in different VLAN's with isc-dhcp-server?

We are managing our network by using DHCP and we sometimes add new subnets (IP Pools) to network through different VLANs. What we want to do is to manage all those IP pools from same DHCP server but sometimes some servers in pool has to reach…
Harun Baris Bulut
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