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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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Create smaller subnets from large subnet

My network is 10.10.0.0/16. I would like to break this up into /24s. My environment: I use /etc/hosts with dnsmasq for DNS and isc-dhcp-server for DHCP on an Ubuntu 14.04 server (gateway, router) with two NICs. eth0 connects to the ISP switch and…
Kheldar Ambar
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classes declaration inside of subnets in isc dhcp

I would like to use class declarations based on a subnet scope, is that allowed? Or are all classes global scope? here is my dhcp.conf snippet: subnet 10.200.147.0 netmask 255.255.255.224 { authoritative; option domain-name-servers …
Polish Nightmare
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How do i keep ISC-DHCPD from offering different IPs when there is two requests from the same MAC

I have a set of Nodes which get their addresses from ISC-DHCPD. Since they boot using PXE, there will be two rounds of DHCP (one from the PXE, one from the OS) and for some reason, ISC-DHCPD will offer two different IPs. This is bad, since the…
Nuwanda
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How to configure DHCPv6 and DNSv6 configuration in Ubuntu 12.04?

I'm planning to configure DHCPv6 and DNS server in my network. I would like to understand whether both DHCPv4 and DHCPv6 can be configured using isc-dhcp-server service? When i tried nslookup domainname it returned the IPv4 address instead of ipv6…
Renold Singh
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calculate reserved ip address based on mac address

Is it possible to calculate ip address based on mac address for isc-dhcp server? For example: 'aa:aa:aa:aa:aa:x' => '10.10.10.x' I have following in dhcpd.conf: subnet 10.10.10.0 netmask 255.255.255.0 { class "v" { match if substring…
kakabomba
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ISC DHCP server: how to use "reserved" statement

I've been looking online, cannot find a single example of how to use the "reserved" statement. Supposedly it goes into the dhcpd.leases file. Stop dhcpd, edit the file, and restart. But it doesn't seem to be working because after restarting it…
Michael Martinez
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Disable to receive address from dhcpd for one host/mac

I have a client in my network, who ask me to prevent him from getting ip address via dhcp. He has a strange software, and can't switch off dhcp-client, but this dhcp client do something bad after it get ip. In same vlan I have clients who needs…
Korjavin Ivan
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ISC DHCPD MAC address matching classes confusion

I'm having trouble successfully matching a mix of different mac address classes to their appropriate subnet declarations. These classes are meant to differentiate IP phones, kvm guests and desktops from each other. So far only the IP Phones…
Unpossible
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"ifup eth0" causes dhclient to bring up more than one interface

Can someone tell me why dhclient is not respecting to only handle the one interface it has been passed? I've seen this multiple times over the years; never figured it out - it's not related to wpa_applicant, my interfaces are pretty standard (see…
fnawothnig
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ISC DHCP Server scope error

Why am I getting the following error after modifying my dhcpd server config? option space definitions may not be scoped
AXE Labs
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ISC DHCP - different subnet for specific mac addresses

I'm attempting to create a different subnet for a few specific mac addresses, and have my DHCP config set up as follows: authoritative; shared-network local { subnet 192.168.2.0 netmask 255.255.255.0 { range 192.168.2.1 192.168.2.99; option…
berry120
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Using isc-dhcp-server to allocate addresses from subnet different from server subnet

I'm trying to break my network into different subnets. Server is located into 192.168.15.0/24 subnet. I have the following declaration in my dhcp.conf: subnet 192.168.15.0 netmask 255.255.255.0 { range 192.168.15.100 192.168.15.250; option…
Mee
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How do I stop a Linux computer from sending a DHCP hostname?

I need to set up a Linux computer so that it uses DHCP but doesn't send any hostname at all. I'm using isc-dhclient-4.2.4 /etc/dhcp/dhclient.conf contains the line send host-name = gethostname(); I've tried commenting out that line and restarting.…
Olathe
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DHCP server with ability to update mac address dynamically

Is there a better way to maintain MAC to IP specification in dhcp with out restarting dhcp service each time when there is an update. is it possible to use DHCP with database in Linux to save all configuration,so that dhcp just needs to read that…
Kevin Parker
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How to forward gateway requests for a subnet through another connection under Linux

I have a Debian machine acting as a DHCP server/NAT, connected via PPTP to another machine,connected to a subnet 10.0.0.0. How do I configure it so requests from clients on this machine for the 10.0.0.0 subnet are forwarded over the PPTP…
Tattar
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