Questions tagged [isc-dhcpd]

Questions concerning the software from the Internet Systems Consortium for setting up a server implementing the DHCP protocol that enables hosts on an IP network to be automatically assigned a unique address and additionally have information about the network delivered to them.

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Where is DHCP data stored on OpenBSD?

I'm currently testing with some DHCP and I'm wondering how I can verify if options like "option host-name" or "option domain-name-servers" really worked on the client machine (OBSD 6.6). Where does it ...
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Can't Enable isc-dhcp-server on boot

I've installed DHCP Server on Proxmox/Debian and did the required configuration for it to be ready for use. However when I run the command root@debian:~# systemctl enable isc-dhcp-server isc-dhcp-...
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How to declare fixed addresses for each subnet in isc-dhcp-server?

On Ubuntu, I've written some host declaration in each subnet with isc-dhcp-server, and each fixed address for each network interface are successfully leased. There are plugged two network cards on ...
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Disabling automatic default route from dhcp server

Hi I'm trying to configure my Raspberry PI to work as a dhcp server. Idea is that through eth0 interface I will connect switch, to which I can connect other devices. But I still want to keep ssh and ...
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Why ISC KEA DHCP (DHCPv4) does not release an IP that has heen reserved and now released?

I reserved an IP ("reservations") for a MAC ("hw-address"). That MAC was removed from my subnet and the IP was reserved for another MAC. That another MAC cannot "get" the IP that is now reserved for ...
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Keeping isc-dhcp-server running even if there's no subnet

I use isc-dhcp-server to provide IP addresses to some instruments that connect intermittently via a USB-to-Ethernet adapter, addresses in the 192.168.1.0/24 range. If the adapter is not connected when ...
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Can't setup isc-dhcp-server in Windows 10 subsytem running Debian

I am trying to setup a DHCP server in Windows subsystem for Linux running Debian. I have followed this guide as I am still quite new to the Linux scene. Although I did change some values in the dhcpd....
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Can a dhcp client select its server? How?

We have a bunch of IOT gadgets which will share cabling with a customer's regular LAN. We would like them to be logically separate. Let's say the regular LAN uses 198.162.x.x, and we want to use 10.10....
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Build DHCP server ubuntu 16.04 on KVM

How to build an DHCP server with ubuntu on KVM ? I have try some guide but when the DHCP client turn on, the interface will use the IP from the KVM network not from the DHCP server i just build ...
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Dhcp leases starting point

I have a linux server which acts as a dhcp server. Dhcp lasse range is 10.15.0.50 - 10.15.255.250. The first ip it leased is 10.15.80.10 Is there any specific reason for this? It keeps leasing ips ...
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DHCP-PD on wan side with Stateful DHCPv6 assigned globally routable ips on lan side. Need to dynamically configure DHCPv6 on lan side

Context I'm currently neck deep in building an internet gateway out of an old fanless, headless Intel Atom/ITX computer I had laying around. These are my requirements: have an ipv4 and ipv6 ip ...
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How should DNS be configured when using a clustered DHCP with DDNS?

I have 2 linux servers on a home network that are configured as DHCP servers in a failover configuration. They also both have named (bind9) installed. I also want each DHCP server to use DDNS so ...
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87 views

DHCPD with two different ranges

I have set up a DHCPD service on a Linux server, which shall provide fixed public IP addresses for cable modem devices based on MAC addresses. Here is the configuration file of the DHCPD. The server'...
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dhcp/named client identification issue

I am running CentoS 7.6 which has been configured as DNS server (via named) and a DHCP server. In DHCP I have configured dynamic updates to my DNS zone such that new client leases will result in ...
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how to create dhcp server master

i want to create a seprate dhcp server that all other servers whose proxmox has been installed on them, get static IP address by dchp server through MAC Address of virtual machines(proxmox servers)
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881 views

PXE Boot: “Failed to load ldlinux.c32”

I'm trying to create a PXE server on my raspberry pi, but if I try to boot, the client shows the Error "Failed to load ldlinux.c32". This is my folder structure of the tftp folder: Here is my ...
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499 views

dhclient is not getting an lease / ip address from dhcp - but windows gets one

How could it be that I get easily an ip address with Windows 10 network manager and not with simple Linux QNAP NAS System? And not working situation. I tried to renew the ip address manually. [...
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Does netmask and option subnet-mask have to be equal on a dhcpd.conf definition?

Using linux servers on a dhcpd.conf file I can make a definition of ip ranges that the server will assign to host computers on the internal net: subnet 10.0.0.1 netmask 255.255.255.0 { range 10.0.0....
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How to get DHCP info from DHCP Client to DHCP Server

I have a firewall with an Internet-facing ethernet, and a home LAN facing ethernet. The Internet-facing interface acquires DNS server ip addresses from the ISP's DHCP server. I would like to propagate ...
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How to override DHCP client identifier

I'm running a DHCP/DNS server with dynamic DNS on Debian 9 (Stretch) How do I override a clients DHCP identifier and place in my own custom value? E.g Android phones on the network identify ...
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Beaglebone Debian/Wheezy. Static IP address some times is changed

I have Beaglebone Black with installation of Debian 7.11 Wheezy I have network which is created from Beaglebone and the Beaglebone IP address is set to be static: 192.168.20.1 This is my /etc/...
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1answer
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Configuring netplan on ubuntu 18 properly

I am trying to configure the wifi and ethernet ports on a linux box in a non-standard way. I have never touched this kind of stuff before, so please excuse my naivety. I have basically just YOLO'd my ...
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Add static route to one specific address to dhcpd.conf

I want to add a static route to 10.13.0.1/32 via 192.168.178.10 to my dhcpd.conf of my dhcpd server. Unfortunately this seems to be insanely complicated. I tried the following: option static-routes ...
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2answers
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Is there a command to insert a mac address into a subnet in dhcpd.conf file?

I am looking for a command that allows me to insert an host inside the dhcpd.conf file without manualy touching that file. I am using: CentOS release 5.3. The file looks like this: subnet 97.129.0....
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Dynamic and Static Leases on ISC DHCP

I'm running ISC DHCPd on Raspbian. I want to set up my server so that all addresses in 192.168.0.0/24 are static leases, and all in 192.168.1.0/24 are dynamic leases. I'd like the two to share the 192....
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208 views

How to make routing changes permanent

I have the below routing rules to apply once tun0 comes up (which is a openvpn tunnel). These rules help push some clients on my network outside the VPN and direct to the internet. What is the best ...
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2answers
193 views

Is there a way to cache the last IP assigned on DHCP clients and use that if the DHCP server is down?

I would like my DHCP clients (CentOS 7) cache the last IP assigned (reserved) for them and use that if the DHCP server is down. Below is the current network interface configuration of my DHCP clients:...
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263 views

isc-dhcp-server configuration [closed]

so I've been bashing the keyboard for hours now and finally I surrender. Anyone else have an Idea of how to configure the ISC-DHCP-SERVER on Debian 9? So it should be pretty simple I guess. I've ...
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2answers
2k views

CentOS 7 DHCP Client - How to use “classless-static-routes” (“code 121”)?

According to this answer... https://unix.stackexchange.com/a/457577/61742 ... I can use the following configuration to use pushed routes from my DHCP server in my DHCP client by placing in the /etc/...
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860 views

How to use ISC KEA DHCP to inform “DNS” and “GATEWAY” to my DHCPv4 clients?

To illustrate I will inform the configuration of my ISC KEA DHCP (DHCPv4) and my DHCP client. Below is the configuration I am currently using for my ISC KEA DHCP (DHCPv4): $ cat /usr/local/etc/kea/...
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Is it possible to use a single DHCP server to push completely different ranges of ip to different network interfaces in different LANs?

Is it possible to use a single DHCP server to push completely different ranges of ip to different network interfaces in different LANs? EXAMPLE: I have the Severs #1 and #2. Severs #1: A DHCP ...
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1answer
2k views

How can I use ISC KEA DHCP (DHCPv4) server to push routes to clients?

QUESTION: I have an infrastructure with 5 servers (Server #1, #2, #3, #4 and #5). I am trying to use a server (Server #5) with ISC KEA DHCP (DHCPv4) ( https://kea.isc.org/wiki ) to push routes to ...
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1answer
827 views

How to route specific client's traffic to VPN (PPTP)?

The setup: I have a server set up as a DHCP (isc-dhcp-server) and DNS (bind9) server (acting as a router). It connects to the internet via pppoe (ppp0) using eth0 device. The eth1 is connected to a ...
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1answer
2k views

dhcpd and bridge - No subnet declaration error

I prepared dhcpd configuration in Debian 8 and it successfully worked but then I added bridge and dhcpd failed. bridge: root@remote:/home/s# brctl show bridge name bridge id STP enabled ...
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1answer
511 views

dhclient does not work in opensuse 42.3, what's wrong?

On openSUSE 13.1 , dhclient eth0 works well, it re-request an IP address from DHCP server, which cost 1~2 seconds to finish. However, with openSUSE 42.3, dhclient always fails instantly. I don't know ...
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1answer
443 views

How do I configure my DNS / DHCP / gateway server with 2 NICs to use its own DNS?

My SOHO lan is served by my main machine which operates as a router, firewall, gateway, DNS, DHCP server and backup server. I've set up bind9 and isc-dhcp-server to do DDNS for the lan clients, while ...
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1answer
340 views

Will dhcpd give away a fixed-address to non-matching client on address dificit?

I have a subnet definition in ISC dhcpd like this: subnet 10.122.224.0 netmask 255.255.255.0 { ... range 10.122.224.64 10.122.224.127; ... host room1-printer { hardware ...
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151 views

DHCP assigns a new IP address when the Time Zone changes

I have a device linux-based. Through a webpage I can change the time zone runtime. This device takes the IP and NTP address from a DHCP. Using two different servers I have two different behaviours: ...
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2k views

Error while installing dhcpd

In order to use Fluxion 2 I need to install these missing components first: I used the command sudo apt-get install isc-dhcp-common But got the following error: This is what happens after I run the ...
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1answer
4k views

How does dhcpd stop on centos?

Normally we use service dhcpd stop to stop dhcpd, but cmd service is just a script, thus it should be something executed by script so that dhcpd finally stops. For example as I write a script, when I ...
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1answer
60 views

How can I ping my dhcp server using hostname?

I've just configured a PC with a dhcp server and an apache server on it. I want to set a hostname to my server (i.g "myserver") in order to be able to access its web server by writing on the browser "...
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919 views

dhcp option domain-name-servers format

I am dealing with subject at school and would like to check correct answer to some test question I have not passed. What does mean a following line in config file dhcpd.conf? option domain-name-...
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How to talk with IP camera through ethernet directly (no switch, hub, routers…). Different subnets in camera and ethernet's port

I want to configure an IP camera which is in my raspberry pi's ethernet port (I connect to it through wifi). I connected the camera and this is what I see when I run ifconfig eth0 Link encap:...
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2answers
1k views

dhcpd isn't matching this mac address

On my little network, I have a simple device which is apparently using only bootp (as opposed to the dhcp extensions to bootp) for obtaining its address. My dhcpd.conf file looks something like this ...
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1answer
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Why won't dhcpd listen on the virtual interface

I think I might be missing something simple, but I'm at the point of needing some extra eyes on the problem. I have a need for 2 separate networks to be on the same NIC (eth1): 192.168.0.0/24 and 192....
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3answers
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Can't start isc-dhcp-server because of the Error : Not configured to listen on any interfaces!

I try to set up a wifi access point with hostapd and isc-dhcpd but the dhcp server doesn't work. The conf file is the same I found in this tutorial: [Hostapd : The Linux Way to create Virtual Wifi ...
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1answer
704 views

ISC-dhcp-server cannot detect ip address conflict

I had a hub connected with a dhcp server(debian 8) and two hosts A and B, as B's interface was shut down at the beginning. Then I had dhcp-server give host A 192.168.2.170 automatically, at that time ...
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1answer
61 views

Why is my switch not getting an address from the specified pool

I'm working to configure a Juniper Networks switch through Zero Touch Provisioning. On CentOS 7, the journal/log/(systemd whatever-it-is) contains this: Nov 28 10:08:46 server dhcpd[8800]: Checking ...
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1answer
75 views

Separate dchpd.lease file for each subnet

Is there a way that I can configure dhcpd to create a separate dhcpd.lease for each subnet? i.e: subnet 192.168.0.0 - \var\lib\dhcp\dhcpd.168.0.0.lease subnet 192.168.1.0 - \var\lib\dhcp\dhcpd.168....
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Is there a way to get a buggy package to work on debian stretch?

I need to install isc-dhcp-server on debian stretch, but the package cannot be installed correctly. apt-listbugs list isc-dhcp-server: #867362 - isc-dhcp-server: DHCP server does not start after ...