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.
118
questions
0
votes
1
answer
27
views
DHCPd receives a wrong MAC-address from VirtualBox Guest
I have VM which is working with "Host-Only Adapter". I disabled VirtualBox's built-in DHCP-server. I've installed isc-dhcp-server on my hypervisor. Then I added the subnet
subnet 10.10.54.0 ...
- 105
-1
votes
1
answer
196
views
How do I use multiple interfaces, with some of them on the same subnets in kea?
I'm currently building a homebrew router, with some changes from my previous builds for more flexibility. I'm running an ubuntu server minimal base, network interfaces managed by netplan ,firewalld ...
- 467
0
votes
0
answers
16
views
Override ISC DHCP's `option routers` with the absence of that option? [duplicate]
I was thinking I'd rather not assign my TV a default gateway, and since I use ISC DHCP 4.4 I tried to override the general subnet configuration with a host specific configuration, like this:
host ...
- 511
2
votes
1
answer
99
views
how to extract option 43 from systemd-networkd's dhcp client?
Just like how dhclient captures dhcp response and stores it in env, is there a way to capture information like option 43 from systemd-networkd's DHCP client and store it in env ?
I have proxy URL ...
- 21
0
votes
2
answers
136
views
How to "predict" a DHCP IP address?
Before launching a VM from my script, I need to figure out which IP address it will get.
So I did:
dhclient <interface>
And this works, because dhclient uses the MAC address from the macvtap ...
- 189
0
votes
0
answers
506
views
NetworkManager to use dhclient to reserve and set IP for wlan intf
I want to reserve and get assigned an pre-defined IP address for wlan0 interface on my client.
I have set:
# cat /etc/NetworkManager/conf.d/dhcp-client.conf:
[main]
dhcp=dhclient
# cat /etc/dhcp/...
- 113
0
votes
0
answers
265
views
isc-dhcp-relay dhcrelay[1019]: Discarding packet received on ens37 interface that has no IPv4 Address
I have a topology that runs a DHCP Server, Relay, and Client. im using isc-dhcp-server
& isc-dhcp-relay.
Im using Debian 11 Bullseye on every server, I configure the service on each server. But ...
- 3
0
votes
1
answer
107
views
Maximum number of static leases I can define in isc-dhcp server
I am trying to figure out the max number of leases I can define in dhcpd.leases file for the DHCP server. Does anyone know how many max can it support?
Thanks
- 5
0
votes
1
answer
185
views
Is there an example dhcpd.conf that contains an example for each option?
OS: Debian 11
I'm attempting to create an example isc dhcpd.conf which has an entry for each option. So far I've managed to find about 30 options to include but I can't find the other ~160. I looked ...
0
votes
0
answers
190
views
Ubuntu 22.04 dhcpd restart on docking station interface reconnect
I have setup on my desk, where Ethernet connected device is plugged into port of my USB-C docking station (same that powers the notebook). I've configured isc-dhcpd to work on enx3ce1a14ec0bd ...
- 271
0
votes
1
answer
16
views
dhcpd snap-in directory not found
I am running dhcpd on Linux system all the subnets information, reservations n all are written in dhcpd.conf
sometimes we need to make client system's IP static and it will become very difficult to ...
- 331
2
votes
0
answers
15
views
NICs, DHCP and IP addresses
I am the sysadmin in a small company, where we build a lot of PC-/workstation type of computers. They usually come with several LAN ports as well as WIFI on the motherboard, and because the machines ...
- 591
1
vote
0
answers
901
views
Debian with SLAAC does not get DNS via DHCPv6
I have two Debian Bullseye containers, one acting as a router. The client gets the router advertisement ant autocinfigures its IPv6 address correctly but it doesn't set the DNS server addresses that ...
- 11
0
votes
1
answer
1k
views
ISC-DHCP server assigning two IP addresses to the same interface?
I have ISC DHCP server on a RaspberryPi (called VPNbridge) with two Ethernet devices. One is ordinary (internal) Ethernet device (eth0), the other is USB-to-Ethernet device (eth1) to which I have ...
- 35
0
votes
2
answers
2k
views
How to bridge ethernet interface running dhcp server
A workstation has eth0 interface running as a dhcp server with the following settings
auto eth0
iface eth0 inet static
network 10.0.0.0
address 10.0.0.1
netmask 255.0.0.0
gateway 10.0.0.1
...
- 65
1
vote
2
answers
511
views
How to override isc-dhcpd option in child group, to hide default gateway
Given the below configuration, how can I undo the routers option for the inner group so that certain machines don't get told what the default gateway is from the outer group?
group {
# A bunch of ...
- 6,653
-1
votes
1
answer
115
views
How to turn a pi into a router? [closed]
How do you use a raspberry pi as a router for a local network (LAN)?
Changed /etc/network/interfaces into
interfaces="eth0"
I installed isc-dhcp-server and configured it like so
default-...
- 65
1
vote
0
answers
231
views
Is it possible to configure IPv6 addresses for ISC DHCPv4 HA failover addresses?
The documentation for ISC's dhcpd.conf has the example (truncated for brevity):
failover peer "foo" {
primary;
address anthrax.rc.example.com;
port 519;
peer address trantor.rc....
- 13
0
votes
1
answer
582
views
ifupdown change parameters dhclient
I have Ubuntu 20.04 where I gave all network functions to ifupdown.
1 of my interface got network parameters by dhclient:
#/etc/network/interfaces
allow-hotplug enp2s0
auto enp2s0
iface enp2s0 inet ...
- 215
1
vote
1
answer
725
views
Conditional evaluation with unnamed option ISC DHCPD
I would like to know how one properly checks for unnamed dhcp options. This link for configuring UEFI is where I got the inspiration. However, I'm completely lost because not even the latest ISC DHCP ...
- 509
0
votes
1
answer
158
views
FreeBSD dhclient don't parse bootp-broadcast-always
So, despite the fact that it's listen in the official documentation, the dhclient binary shipped with FreeBSD 12 does not support "bootp-broadcast-always". I'm trying to include this option ...
- 11
1
vote
0
answers
181
views
ISC-DHCP-SERVER Warnings
I have a ubuntu server 18.04 configured with two bonded gigabit ethernet NICs. Upon restarting the DHCP server I noticed the following error/warning. The server starts fine and the bonded link is up, ...
- 83
0
votes
1
answer
747
views
VirtualBox VM PXE boot install fails with err:3c092003
I am using VirtualBox and have two VMs
VM A:
NAT networking adapter
Host-only networking adapter
Internal Network adapter (network is called "test")
and VM B:
Internal Network adapter (...
- 123
0
votes
1
answer
745
views
isc-dhcp 4.2.5 -- does it have support of dhcp-client-identifier and vendor-class-identifier?
I have isc-dhcp-4.2.5 server and client installed on two CentOS-7.4 boxes. I know this is quite old distro, but I can't change it for various reasons.
Dhcp server configuration:
option domain-name &...
- 1,783
0
votes
1
answer
248
views
detect if DHCPOFFER has been received
The Linux box with DHCP client does not know beforehand if it is connected to access or trunk port, so it has to determine it somehow. So I'm thinking of the following:
have the box send a ...
- 1,783
0
votes
3
answers
820
views
isc-dhcp-server and pihole
I have two single board computers in my local network (Pine64 and nanoPI), which I use for various purposes.
The latest thing I wanted to do with them is to have failover DHCP and DNS for my local ...
- 1,660
0
votes
1
answer
2k
views
Why I can't connect to evil AP, created by a fluxion in non-Kali Linux distributive?
I cloned fluxion with a following command: git clone https://github.com/FluxionNetwork/fluxion --recursive
I added the Kali Linux repositories to my distribution, installed all the necessary programs (...
- 173
0
votes
1
answer
522
views
Issues converting docker run command to a docker-compose.yml config
I am trying to set up dhcpd in a docker image for my home network.
I have cloned this repository, and had it working fine with my dhcpd.conf
To run it, I have to execute this command using docker run:
...
- 163
1
vote
1
answer
19k
views
Once again: Failed to start LSB: DHCP server
i want to create something like this with my raspberry.
↑
│ Uplink
│
┌────────────┴────────────┐
│ wlan0 │
...
- 39
0
votes
5
answers
165
views
SED/AWK/BASH expand alphanumeric delimited fields with '0' padding
I need help with a regular expression to expand any 1 character field to 2 characters with 0 padding. 0-9, a-f alphanumeric field.
Given:
echo $dhcp6_s46_cont_mapt
0:5b:0:9:40:0:64:ff:9b:0:1:0:3:0:59:...
- 1
4
votes
1
answer
2k
views
ISC DHCP dhclient: How to supersede DNS name servers with IPv4 and IPv6 addresses?
I want tp supersede the name server information, which I get from the DHCP server with my own configuration. Therefor I'm using the following option in my /etc/dhcp/dhclient.conf:
supersede domain-...
- 2,443
0
votes
1
answer
285
views
set the router's static mac address via isc-dhcp-server
Is it possible to set an ip with its relative mac address so that the clients (during the DHCP request) in addition to receiving the various data, will also directly receive the mac address of the ...
2
votes
0
answers
153
views
dhcrelay problem?
dhcpd reply not getting to final client.
Background:
House network:
107.nn.164.89 - to internet
192.168.100.0/24 - house local lan1
192.168.1.254/30 - gateway to mancave
Mancave:
192.168.1.253/...
- 29
1
vote
1
answer
745
views
egrep, sed or awk to get the number of active dhcp leases?
Let's say I have the following dhcpd.leases file:
# The format of this file is documented in the dhcpd.leases(5) manual page.
# This lease file was written by isc-dhcp-4.3.6-P1
# authoring-byte-...
- 111
0
votes
2
answers
385
views
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 ...
- 1
0
votes
0
answers
2k
views
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-...
- 101
5
votes
1
answer
6k
views
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 ...
- 53
4
votes
1
answer
7k
views
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 ...
- 143
0
votes
0
answers
79
views
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 ...
- 555
2
votes
0
answers
2k
views
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....
- 21
0
votes
1
answer
450
views
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....
0
votes
1
answer
152
views
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 ...
- 111
3
votes
1
answer
1k
views
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 ...
- 560
0
votes
1
answer
2k
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'...
- 25
0
votes
1
answer
53
views
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 ...
- 2,010
0
votes
0
answers
49
views
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)
3
votes
1
answer
7k
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 ...
- 31
0
votes
1
answer
3k
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.
[...
- 143
0
votes
1
answer
1k
views
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....
- 103
0
votes
0
answers
239
views
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 ...
