Questions tagged [dhcp]

The Dynamic Host Configuration Protocol (DHCP) is a network configuration protocol that assigns IP addresses and gateway configuration automatically.

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Can't get outside gateway

My problem is a client computer can't get outside gateway when the client uses the vlan interface of gateway. IP addresses gives the router through dhcp (for vlan and non-vlan interfaces). Some output ...
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Netplan config file not disabling dhcp

I've setup ubuntu 20.04 desktop version on a PC that has 2 NICs. I have uninstalled network-manager and just want to simply have a static IP on each interface. I've got the netplan .yaml file setup ...
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Import Windows DHCP leases into a Linux DHCP Server

I'm replacing a Windows DHCP server with an Ubuntu server. I need to migrate leases in the new DHCP. What would be the easiest solution? Create reservation in my dhcp.conf? (I would prefer have only ...
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Force NetworkManager to perform a full DHCPv6 request

In Ubuntu 20.04 NetworkManager launches dhclient with the -S option (Perform an information-only request over DHCPv6 to get stateless configuration parameters.) I need DHCPv6 to send Solicit & ...
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How to change currently used DNS server

My network setup has multiple DNS servers which are set via DHCP: 192.160.1.100 This is a PiHole with some local DNS records entries as well. These local records do also exist on external DNS ...
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Old static IP address returns after reboot (Ubuntu 20.04)

I have Ubuntu server 20.04 running on my home network as a media server and for storage. I changed ISP's recently (I live in the country and am limited on my ISP choices) and they don't allow me to ...
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Fixed address on DHCP server isn't working

I'm running Ubuntu 20.04 as a DHCP server and I tried to assign a fixed address to a client which is another Ubuntu os on a Virtual box, and both of them are in the same internal network, but, it ...
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apt-get install isc-dhcp-server command not working on ubuntu 18.04.05 desktop and live server operating systems

Error message : I did update the packages by using apt-get install update command.. Update was successful. Then I try the command isc-dhcp-server , but got an error message as shown in the image. I'm ...
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How to disable connection reset on DHCP Timeout?

Have a shiny new Latitude running Ubuntu 18.04 with all the updates. I'm trying to replicate a network manager config that I have working on CentOS 7 and Debian where I have one Untagged and several ...
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cat: /var/lib/dhcp3/dhclient.leases: No such file or directory

I searched on how to print dhcp details on Ubuntu , I found few information here. However it always displays "/var/lib/dhcp3/dhclient.leases: No such file or directory". How to resolve this ...
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My server has a double IP address for one NIC. How can I resolve this?

My server (20.04.2) has a double address and I tried removing one since it does not belong and I want to free the IP for another machine. Is there any way to reset/remove the old ip? (10.0.0.14/24) I ...
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WiFi AP's have no internet connectivity after seting up IPTABLES

I have set up an Ubuntu 20.04 SERVER to act as a Gateway/Router. Now that the gateway is functioning, I now no longer have WiFi access via several AP's in my house. I am able to connect to the AP's, I ...
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How to test to see if packets are moving between two ports on a dual port NIC

I'm trying to set up a home router on Ubuntu 20.04 Server. I have followed dozens of on-line tutorials, and for the life of me, I can't get this to work. As soon as I get everything set up, nothing ...
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DHCP server fails to start on startup

I have isc-dhcp-server installed on Ubuntu 20.04.2 LTS but it won't start (stopping and starting it manually does nothing). It's a virtual machine on a private network and I'm only trying to set up a ...
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TP Link T4U adapter not showing up in router's DHCP clients list

I connected a TP Link Archer T4U (FCC ID: TE7T4UV3) to my Ubuntu Server 20.04, and then installed the cilynx/rtl88x2bu driver module following the instructions in the README. VER is 5.6.1. I see a ...
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Why can't change ip ubuntu server 20

In host main, has service dhcp with bind9 And configure for distribute ip static for one new mac 11:27:00:6a:5b => 192.16.2.23. But when installed the system operation Ubuntu 20, services dhpc ...
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How to selectively alternate between DHCP and Static IP from Network Dialog, Ubuntu 20.04

I desire to be able to connect LapTop EtherNet port to either a DHCP router OR a static IP 3D Printer. I have a EtherNet connected 3D printer, to which I have a CAT5 cable directly connected between ...
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Ubuntu Server 20.04.2 is getting the wrong address

After restarting Ubuntu Server 20.04.2, use the wrong IP address. It is registered to DHCP for a MAC address such as this '9f6e852400020000ab117b61e29f5a2058bf'. When I run the command: sudo ...
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Making Ubuntu 20.04 into a Router: something keeps adding default route for the lan interface

I have read a lot about NetPlan - it sounds awesome compared to the old interfaces file... But everything I've tried generates a default route to the lan interface - (which disables access to the ...
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Why only one NIC obtains an IP address?

I'm learning on how to set up a network properly, and I'm a bit stuck. I've created two separate Ubuntu Server VMs in VirtualBox, then connected them through an internal network (intnet0). With CLI ...
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How to connect to internet from Ubuntu which is installed in a virtual machine using VMWare Workstation?

Today I downloaded VMware Workstation 16 Player and I am running Ubuntu 20.04.2.0 in a virtual machine. My host os is Windows 10 x64. The problem that I have is that I can’t find a way to connect the ...
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netplan - Network with DHCP configured, but no internet

I am trying to configure my Ubuntu Server 20.04 LTS to use DHCP in its network configuration. Many tutorials on the internet recommend that I create the following file with the following settings... ...
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Very long startup time on Ubuntu Server (network configuration)

I've been trying to sort out two problems that I suspect are interrelated. Recently, our network got reconfigured and afterward, I encountered a very long boot time due to network configuration ...
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systemd-networkd: enp0s8: DHCP: No gateway received from DHCP server

I am setting up a server with the following configurations: Ubuntu 20.04 C# .NET Core 5.0 Framework, not runtime Apache 2.4.41 All running on VirtualBox VM I have built and deployed an example ...
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Keep file permissions on dhcpd.leases after reboot on Linux

We have a Linux machine on which we run our .NET Core app. This app is a web UI which is used to display and configure a system of EEPROMs. The app reads the dhcpd.leases file, located in the ...
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No DHCP or proxyDHCP offers were recived

I'm trying to install a server for multiple machines, already did the main steps, but when I try to turn on a machine, it keeps loading DHCP and then shows the error below. What seems to be the ...
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isc-dhcp-server post installation interface Error

i was installing isc-dhcp-server, it installed successfully but when i restart the kali it just return me with terminal not gui.I mean it just gives me with cli not gui.Luckly i had taken the snapshot ...
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Unattended ubiquity seed url can only be found via ip but not via DNS name

I am able to install my linux ubuntu / mint in an unattended way with preseeding via a grub command line like linux /casper/vmlinuz toram ip=dhcp -- automatic-ubiquity url=http://192.168.178.38:8080/...
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NetworkManager can't update settings if Netplan config exists

I am using 18.04.4. I configure an interface using netplan (/etc/netplan/enp0s3.yaml), set a static IP, and set the renderer as NetworkManager. My file looks like: network: version: 2 renderer:...
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My IP changes after reboot

I have Ubuntu server 20.04 and it got IP from DHCP. The LAN Team define my IP and mac in DHCP to reserve IP for me, but every time after reboot my IP got changed. we can't fix IP manually in our ...
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DHCP server on Ubuntu Core

New to Ubuntu Core 20 uname -a Linux ubuntu 5.4.0-1025-raspi... Is this release not intended to run network utilities like a dhcp server? I only need a dhcp server, ssh, and dns. Core seemed like a ...
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IPv4 address from ifconfig differs from dhclient

After replacing the DHCP server (new router) I experience a weird situation on my ubuntu server (20.04.2 LTS) ifconfig says (old): enp0s31f6: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 ...
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Ubuntu Server has two IP addresses, but only one is assigned in netplan

I have entered the static address 192.168.3.3 but the server gets a second address on the same network card. I have no idea how to turn it off, I can't turn it off DHCP because it is needed for the ...
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Sporadic internet outage using Ethernet from wall jack, but WiFi works

I have two Ethernet jacks in my apartment; I have a WiFi router running from one jack, and an Ethernet cable connecting my laptop (Ubuntu 20.04) to the other. I prefer the faster internet from cable, ...
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Diskless client doesnt boot. Does anybody still use diskless clients?

I have a class of machines on my network that should not have a harddisk (of any kind). They boot diskless and are very useful to me like that. (e.g. I need to be able to turn them off at any moment, ...
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38 views

Where does dhcpclient store address

I have recently had to replace my motherboard (don't ask, if you don't want to see a grow-up cry ;-) ) New motherboard -> new ethernet -> new MAC address -> new IP address via DHCP. As I had ...
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51 views

Allow DHCP to Update Bind9 DNS with Samba AD

So I'm upgrading our current NT4 domain to Samba AD with Bind9 DNS. Our current DHCP/DNS setup is on one server, separate from the Domain server. With Samba AD, we'll be using Samba's tools to manage ...
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155 views

How to route all traffic to a dynamically configured default gateway?

Some context: I'm trying to create a virtual private network on my laptop using VirtualBox. I want the virtual machines to be inside a private network, so a virtual machine can only be reached by ...
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109 views

Why does apparmor kill dhclient?

I successfully upgraded my KVM server to 20.04.1 LTS but when later trying to access it by ssh, there were no network route to the server, while the VMs still were happily running just great. Logging ...
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How do I let my client to use internet via using iptables in Ubuntu 16.04 in VirtualBox

I've got setup dhcp server who is listening for IP requests in private server. When client connects to it, he gets an IP, gateway and dns address. Server can ping him and client ping server, but ...
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Problem with configurating dhcp server

I'm having a bit of a problem with forwarding the internet from server to client. I've done everything this site told me to https://zse.rzeszow.pl/ubuntu/routing-dhcp-ubuntu-server, but client still ...
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Ubuntu 20 Ethernet Sharing not giving out dhcp address

Sharing wifi over usb ethernet to a windows tower. Ethernet device shows up in lusb, network manager gui. Have link light on dongle. Win comp shows packets sent but not recieved. Hangs at identifying ...
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Can not ping my IoT device using IPv6

I am trying to ping6(ping with IPv6) an IoT device from an ubuntu machine. I installed a DHCPv6 server on ubuntu machine and connected both the ubuntu machine and IoT device to the same network. My ...
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How to change the new long mac address Ubuntu is using for network adapters

My question is if it is possible to set that new style MAC address to a specific value? Similar to the UUID of a partition, which is generated during the installation, but can be re-assigned a ...
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DHCP dns stopped working on ubuntu 18.04

I have setup new ubuntu 18.04 server which has dhcp assigned ip and dns 192.168.120.62 , after setup when i checked i waw able to get result using nslookup for local dns entries of 192.168.120.62 but ...
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ubuntu 16.04 network setting, why is my /etc/network/interfaces file so simple(settings only for lo)?

In https://geek-university.com/linux/configure-dhcp-client-on-ubuntu/, the /etc/network/interfaces file contains dhcp setting for eth0. But my 16.04 machine contains just contains below 4 lines. # ...
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254 views

Ubuntu server has two ip addresses not sure why

My Ubuntu server appears to have two ip addresses (192.168.0.108 and 192.168.0.109) but I haven't been able to get rid of the one. Devices and setup: TP-LINK AX1500 Router (handles dhcp, DNS ...
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18.04LTS - Two NICs (NIC and Bond) same subnet, prioritize traffic on Bond #1

I have two NICs (one NIC and 1 Bond to be exact), but both are on 192.168.0.X subnet. I wanted to keep a secondary NIC on the same subnet in case my Bond goes down. Netplan, the NICs, and the Bond are ...
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Why is my LAN and DHCP conf “not a private class subnet”?

I am maintaining a gateway server with a small LAN & wifi which acts as a firewall, backup server, broadband gateway, media server etc. It was getting overcomplicated with Bind9 so I just de-...
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Netplan can't get ipv4 address

First, I have to say I'm quite a noob. I have Ubuntu Server on rpi4. I want that all my connections go through it. I did what is explained here: https://raspberrypi.stackexchange.com/questions/109425/...

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