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

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nameserver in resolv.conf not getting updated

I'm trying to use a dns service on my xenial. I have added the following line to dhclient.conf. prepend domain-name-servers 208.67.222.222,208.67.220.220; After reconnecting or rebooting ...
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8 views

VM Ubuntu Server 16.04 no network connection with static IP

My Setup: Oracle VM Virtual Box running on a windows 7 box Virtual hosting is enabled in Windows Box BIOS Steps taken: With Dynamic IP assignment the the Ubuntu server can ping everything. No ...
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12 views

How to add dhcp client to verify that dhcp server which i installed on my ubuntu is working

I have installed DHCP server on my Ubuntu system. I have started it and now it's run on running state. I want to add a client to it to verify that the range of addresses. What should I provided ...
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1answer
15 views

How to specify additional search domains for resolver in 16.04 when using DHCP?

With Gnome Ubuntu 14.04, it was possible to specify additional search domains for the resolv.conf, when editing a network connection, like so: But where do I find this field for the "additional ...
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1answer
28 views

How do I get static IP working?

I have two PCs running Ubuntu 16.04 (one 32bit one 64bit) and a old TRENDnet TW100-S4W1CA router. The problem is that when I set the IPv4 address to "manual" the connections gets initialized just ...
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2answers
33 views

eth0 not working anymore after trying to set static ip

Hi I tried to set up a static ip and have lost the ability to use eth0, I can see that it is there but disabled, tried the edit with the auto eth0 and DHCP but to no avail, been trying all sorts of ...
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1answer
28 views

Bridge does not get IP from DHCP server on boot

I have a bridge created on my ubunut 16.04 box. The bridge does not get an IP from my DHCP server on the network on boot. /etc/network/interfaces : # interfaces(5) file used by ifup(8) and ...
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53 views

setting up ethernet port for DHCP in Ubuntu 16.04

I have just installed Ubuntu server 16.04 and as per new scheme the default ethernet port is longer named eth0 but is named as enp02s. But this port only gets configured with a private ip address such ...
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137 views

Ubuntu 16.04 - system boot waits saying “Raise network interfaces”

I have an Ubuntu 16.04 system with two interfaces - eth0 configured with DHCP and eth1 configured with static ip addresses. The /etc/network/interfaces file has the following config # The loopback ...
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12 views

ubuntu isc dhcp gives ip only once

My system is a Ubuntu PC with 3 thin clients that are connecting through ltsp to it. There is also a router inside this network so there are 2 DHCP servers inside the network. I've set the IP ranges ...
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38 views

Can't resolve hostname by ip address over nslookup

Hope, someone can help me. I've already searched the web for hours, but I can't solve this problem: I've got an Ubuntu Server on my LAN. I can fully use it (samba, ssh, apache2, xmpp...) by using ...
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26 views

Route traffic from eth1(local network) to eth0(external network) where ubuntu is dhcp server

I have an ubuntu server which is configured to be DHCP server to give IP address to a cisco switch through eth1. eth0(connected to the external network) ip:10.106.24.182 netmask: 255.255.255.0 ...
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1answer
28 views

How to restore DNS being automatically obtained?

After a reboot I can no longer connect to the internet in the sense that it appears DNS lookups immediately fail. I am connecting via WiFi to my phone, which works as a dongle (I have no landline ...
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1answer
48 views

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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41 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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1answer
135 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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2answers
3k 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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11 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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15 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
132 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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13 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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37 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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1answer
645 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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45 views

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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58 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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28 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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22 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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66 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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39 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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31 views

client DHCP configuration : No DHCPOFFERS received

I worked on this architecture of network ! Why are no DHCP offers received?
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54 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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2answers
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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
17 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
87 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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79 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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1answer
48 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
21 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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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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11 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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21 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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43 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
37 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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24 views

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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51 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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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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62 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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63 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
47 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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49 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 ...