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

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How to release an IP address and renew from the commandline?

I am using modern versions of Ubuntu that use network-manager, and I would like release and renew my network settings through the commandline. In the olden days when Ubuntu used the interfaces file, ...
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24 views

IP address aquired, but no internet

I've got a laptop running Ubuntu 16.04 server. It's a fairly new install (a couple of days old), and I don't remember installing anything unusual. All installed software except for plex media server ...
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40 views

DHCP connection does not set default gateway automatically

I just did a fresh install of Ubuntu 16.04 (Xenial). I've configured /etc/network/interfaces to bring up the wlan interface automatically using DHCP: auto lo iface lo inet loopback auto wlp2s0 ...
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274 views

Set static IP Ubuntu 16.04

I am a new with Linux, having years experience with Windows servers/desktops and am having issues setting a static IP. I am using a method used for previous versions of Ubuntu, which doesn't seem to ...
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7 views

Multi-NIC client w/ isc-dhcp-server & dynamic bind9 recommended configuration

I have a properly installed and configured isc-dhcp-server & bind9 box that is correctly updating DNS records based on leases. This works well. I understand how the isc-dhcp-server can be ...
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14 views

Is it possible to offer a DHCP lease between 8am and 5pm and block access otherwise?

I am wondering whether dhcpd can be setup for some leases to only work between certain work hours instead of 24/7. I know I could use CRON and restart the DHCP server with configuration A (allow ...
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2answers
62 views

UBUNTU DHCP not assigning IP address to clients.

I have a minimal knowledge about ubuntu. I am trying to run a DHCP server on UBUNTU so as to share Dongle 3G Internet. I disabled router's DHCP and followed the following guide to setup DHCP server in ...
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11 views

Ubuntu 14.04 Server DHCP issue

I'm running Ubuntu 14.04 Server 32-bit. I installed with the option 'Minimal Virtual Machine' and I'm running the Server on VMware Workstation 12 on Windows 10. I'm seeing a strange issue with DHCP ...
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26 views

Can I force dhclient to use the client identifier from /etc/network/interfaces

I'm using Ubuntu 12.04 LTS with isc dhclient version 4.1. My goal is to use DHCP to get IP addresses for multiple sub-interfaces on eth0. I have three stanzas configured for that in my ...
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267 views

MAAS interface eth0 (External) and eth1 (internal)

I have two interfaces configured in MAAS under Cluster eth0 - external IP VLAN 10 eth1 - internal (10.x.x.x) VLAN 20 - DHCP-DNS Managed I am going to add a node in MAAS.....I have setup the node ...
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How to force dhcp client to allow a self defined domain name

I'm configuring a 14.04 lts server without network manager installed. I set in /etc/dhcp/dhclient.conf: send host-name "os-vps276.projet-okinawa.org"; supersede domain-name "projet-okinawa.org"; I ...
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36 views

How to stop dhcp discover messages after dhcp release?

I configured a wrong interface as dhcp and did a ifdown and ifup on that interface. DHCP client keeps sending DHCP discover messages and I had to wait for a while for it stop. ctl+z or ctl+c didn't ...
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21 views

static arp with a wlan repeater

The scenario: when i activate static arp at my dhcp settings in pfsense i can't access pfsense itself. but when i deactivate static arp i have access to pfsense. then i found out with a wireshark ...
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18 views

ISC DHCP primary ip using a variable

How can I define my DHCP zone using a variable instead of an IP address or name (in /etc/hosts): Instead of : zone z.example.com { primary 192.168.0.1; secondary 192.168.0.2; } Defining ...
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61 views

dns server assigned from dhcp is equal to the address of the client

I had the following enviroment configuration: http://i.imgur.com/9chRJT8.png Ubuntu VM /etc/network/interfaces: auto eth0 iface eth0 inet static address 192.168.10.11 netmask 255.255.255.0 ...
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29 views

Failed to restart isc-dhcp-server.service: Unit isc-dhcp-server.service is masked

Basically we follow this guideline to setup dhcp server. We downloaded isc-dhcp-server in Ubuntu. After we changed the /etc/dhcpd/dhcp.conf, we restart dhcp server by entering sudo service ...
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22 views

client DHCP configuration : No DHCPOFFERS received

I worked on this architecture of network ! Why are no DHCP offers received?
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35 views

isc-dhcp-server Computers not receiving IP addresses

I originally ran isc-dhcp-server on a Raspberry Pi until I deleted /lib by accident. I managed to get /etc/dhcp/dhcpd.conf. I installed isc-dhcp-server with sudo apt-get install isc-dhcp-server. Now, ...
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How can i add additional IP address to my ubuntu server?

I am using Ubuntu server 14.04. I am connecting to internet via dhcp protocol. Right now i connected one more NICs/Lan Cards and i want to assign them IPs. So as a final result my server will be ...
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1answer
16 views

Can`t display DHCP IP Adress leases

I ve been trying to Display the IP Address leases with: gedit /var/lib/dhcp/dhcp.leases gedit is installed but it still doesn`t work. (gedit:6004): Gtk-WARNING **: cannot open Display: ...
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1answer
55 views

Ubuntu 14.04 no longer detecting eth0

I have set my eth0 to Shared Internet with other and that used to work. I can't figure out what I may have done to break this, but the eth0 doesn't seem to detect the link ... sometimes it does and ...
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10 views

LAN Card behaving inconsistently

I have a system with Ubuntu Server 14.04 installed on it. The onboard ethernet port is faulty. As I want to setup DHCP server on it, I have installed two external LAN cards. I also have a leased line. ...
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62 views

How to set up Ubuntu Server as a wireless + ethernet router with IPv4 and IPv6

I have a computer running Ubuntu Server (14.04 but I want to upgrade to 16.04 when it becomes available) with two Ethernet interfaces and one WiFi interface. The interfaces are: Ethernet towards ...
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43 views

How can I assign another static IP address to another LAN Card?

Here is my /etc/network/interfaces configuration: # This file describes the network interfaces available on your system # and how to activate them. For more information, see interfaces(5). # The ...
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1answer
17 views

How to supernet Class C IP address with isc-dhcp server?

Is this possible? subnet 192.168.1.0 netmask 255.255.248.0 { range 192.168.5.1 192.168.5.254; }
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19 views

What happens if the router is reachable but I cannot ping the IP address of my own?

xxx@xxx:~$ ip -6 neigh fe80::fe48:efff:fe30:c7b dev eth0 lladdr fc:48:ef:30:0c:7b router REACHABLE xxx@xxx:~$ ifconfig eth0 eth0 Link encap:Ethernet HWaddr 28:d2:44:e6:9f:d4 inet ...
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9 views

What should I configure if my ISP uses DHCPv6 to allocate IP address and NDP to advertise packages?

There seem to be problems with my ISP's IPv6 service so that it makes my connection not stable. I have heard from others that the ISP router uses DHCPv6 to allocate the IPv6 address. However, it uses ...
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19 views

Cannot install DHCP

I am trying to install a isc.dhcp-server on Ubuntu 14.04.4 LTS, but every time when I type: sudo apt-get install isc-dhcp-server it cannot find any package by regex. Can someone help me? It is ...
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30 views

dhclient bound to recorded lease even if no DHCP server is availabe

My Ubuntu machine is connected to switch and switch is connected to DHCP server(router).Now whenever DHCP server is down but link is available through switch it tries DISCOVER multiple times. But ...
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1answer
31 views

Forward TFTP to different server

I have Ubuntu 14.04 with DHCP running, I have to forward TFTP requests to Windows Deployment server, how do I do this? Is it even possible?
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How can I route DHCP traffic from eth0 to bridge?

I have a server with that has its eth0 interface configured via DHCP, assume network 192.168.0.0/16. On this sever I am running another DHCP server (MAAS). I would like the MAAS server to received ...
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41 views

Cannot set static IP

I have a modem + router device. I found nothing on the admin pages about static IP, I can configure only DHCP, so I assume I have to set the static IP on the computers using the operating system ...
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53 views

how to install ubuntu server 12.04 through netboot using pxe

I have ubuntu server 12.04 installed as server. Also tftp server, dhcp3-server, syslinux and apache were installed on it. There are lots of clients which I am trying to install ubuntu server 12.04 on ...
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49 views

OEM install asking for nameservers after oem-config-prepare

I'm trying to create an install image of server 15.10 that I can deploy to a few dozen machines by running through the OEM install, customizing packages and settings, then running ...
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54 views

Configure Ubuntu with 3 NICs as gateway/router

I have a PC with Ubuntu 14.04, which I'm trying to configure as a gateway/router for my LAN. The topology is as below: Network topology I'm configuring 1 subnet only - eth0 and eth3 will both be ...
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1answer
41 views

wifi bridged to ethernet on a DIY router, not working

I have a mini PC with dual nic and wifi setup to act as a router my setup: WAN port (enp2s0) -> cable modem LAN port (enp3s0) -> gig switch LAN and wifi are bridged to create "br0" which has a ...
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33 views

DHCPDiscover: DHCP doesn't issue out IP Address

I've been having problems working out why my VM Server isn't getting a dynamic IP address. I am using VM-Workstation 10 and an Ubuntu VM-Server 14.04 as my operating system. I have my Virtual Network ...
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22 views

lxc assign MAC adress after first creation

I found much information in this question. But after system reboots dnsmasq assigns randomly IP addresses ignoring entities inside file: /etc/lxc/dnsmasq-hosts.conf So I checked logs and gets this ...
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93 views

Assigning a static IP to Ubuntu Server 14.04 to access ownCloud out of the server

I'm a new Ubuntu user and I did this steps recently, with 'AskUbuntu' support: - installation of Ubuntu, ownCloud server + client, Oracle VirtualMachine - configured ddns (duckdns.org) - port forward, ...
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55 views

How to allow DHCP between 2 networks using Shorewall?

I have a server with hyper-v and 3 networks: eth0 is virtual, eth1 is physical, eth2 is extranet from ISP. Virtual network has a DHCP running and all virtual machines can reach it fine. But not the ...
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176 views

Can't get my DHCP server started

I am trying to start a DHCP server on my Raspberry Pi, however I keep getting the error below: pi@raspberrypi ~ $ sudo /etc/init.d/isc-dhcp-server start [FAIL] Starting ISC DHCP server: dhcpd[....] ...
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1answer
99 views

eth0 not in /etc/network/interfaces [duplicate]

I'm using Ubuntu 14.04 and my ethernet (eth0) connection is working fine. (with DHCP) However, when I read the /etc/network/interfaces, there is nothing about eth0 in it. Is Ubuntu 14.04 reading ...
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87 views

Unstable Wifi with Ubuntu 14.04 and Realtek Wifi Adapter

I've been fighting with this problem for a couple weeks now. I've made some progress, but haven't gotten to the point of a truly stable internet connection via WIFI. Unfortunately, the issue is at ...
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20 views

Config for direct network connection between 2 servers both with connection to switch

I have the following setup: Server 1 eth0 > Switch Server 2 eth0 > Switch eth0 on both currently uses DHCP where the DHCP server will assign the same IP each time, so they have static IPs. ...
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1answer
118 views

WiFi won't work, no matter what

Ok so I've been trying to troubleshoot this for a couple of months now but I just reached the end of my capabilities. The basic problem is that my wifi does not connect to my home network (at least ...
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1answer
82 views

Juju LXC Containers getting wrong DHCP?

I'm using a networking similar to this one: http://www.openstackbasement.com/maas-network-hardware When I run: juju deploy --to lxc:0 mysql juju deploy --to lxc:0 keystone etc... According to ...
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48 views

Create WIFI access point in 14.04 with bridge mode

Currently i am creating wifi access point using Unity’s default Network Manager IPV4 settings Shared to other computer and finally edited the file /etc/NetworkManager/system-connections/wifi-hotspot ...
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79 views

Internet Networking not working unless dhclient is run manually

Edit: Please note, this problem is caused from a broken package, and is talked about more in another post. If you need a quick fix to temporarily get back the internet to fix the problem, I recommend ...
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2answers
101 views

WiFi Problem in Ubuntu 14.04

The Problem: I have a dual boot setup with Windows 7 and Ubuntu 14.04. Everything was working fine until yesterday morning after login I couldn't get the wifi in ubuntu stopped to work (see details ...
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21 views

ubuntu vm unable to take ip via dhcp

I copied a ubuntu vm from an esxi server to a vmplayer. I want make the vm visible into the network so I enabled dhcp. My /etc/network/interfaces looks like this: auto eth0 iface eth0 inet dhcp ...