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

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Ubuntu 12.04LTS server: cannot get isc-dhcp-server to start

When I try and start isc-dhcp-server I get a can't open /etc/bind/rndc.key: permission denied So per instructions from Ubuntu site I added to /etc/apparmor/usr.sbin.dhcpd /etc/bind/r, ...
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1k views

Can't resolve windows domains in local network

I've installed ubuntu on my computer at work because I think it is a perfect system for work which I do but I got some issues. I can't resolve domains from windows DNS server. Basically, we have two ...
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1answer
204 views

Ubuntu How to setup Multi Dhcp Server

If you have 2 NIC (network Lan card) each connected to different networks: => eth0: 192.168.1.0/24 => eth1: 192.168.2.0/24 I need the Dhcp server to serve the different subnets ip leases ? How to ...
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How can I find my DHCP server?

On my LAN there are multiple DHCP servers running, and all of them are on the same range. Now I use a machine which has a dynamic IP address from a DHCP server. I have to know from which server it ...
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1answer
435 views

MAC filtering for DHCP3 server

I am setting up a school network and i have an ubuntu 13.10 sever. I am looking for a way to deny all devices to get an ip, except for the devices which MAC address I specify in a certain list. As I ...
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253 views

Captive portal setup and content of interfaces file

I am trying to design a captive by referring to this link Captive Portal Using PHP and iptables Firewall on Linux In initial setup(linux box router) it is said that my interface file should be as ...
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113 views

How do I bind my internal ip to my external ip with dhcp?

I am making a minecraft a minecraft server, I have forwarded the port 25565 and have done everything necessary for it to work, with a functioning DNS that updates from the external ip every 5 minutes. ...
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74 views

Cannot connect to the network anymore using DHCP

It's an apartment house's network and the connection worked fine for two days until yesterday. Problems are same plugging in directly with network cable or using a switch. If I boot with windows, ...
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54 views

Question about dhcp server in ubuntu server 12.04

I configured a dhcp server , i then configured a client to take a dhcp ip . I need from server terminal to know the addresses released to my domain Pcs .
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210 views

Network starts slow on Ubuntu 13.10 start or resume

I have this laptop (ThinkPad X1 Carbon) with Windows 7 and Ubuntu 13.10 dualboot. Recently upgraded from Ubuntu 12.10. The good thing about this upgrade is that Ubuntu 13.10 starts very fast compared ...
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459 views

adding request to DHCP starvation using Scapy?

using this code for DHCP Starvation conf.checkIPaddr = False ...
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1answer
397 views

dhclient.conf supersede stanzas ignored

I'm putting the following lines at the top (also tried the bottom) of my dhclient.conf file: send host-name "hostname"; supersede domain-name "my-domain-name" supersede domain-search "my-domain-name" ...
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198 views

How can I share my internet connection from windows to ubuntu?

Okay, so I have a mobile connection attached to my main pc (windows 8.1), the address range is 192.168.43.1 - 255 with the gateway being 192.168.43.1 and I want to share this to my Ubuntu server which ...
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88 views

DHCP starvation with Scapy (12.04) only “starves” one single address repeatedly

so im running this: conf.checkIPaddr = False ...
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2answers
2k views

Configuring a network on a multi ethernet port server

Hy to all: I have just installed Ubuntu Server 12.04.3 on a Sunfire X4100 This server has 4 ethernet port, my target is to use: eth0 to connect to the modem and so to internet eth1, eth2, eth3 to ...
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1answer
47 views

No network out of the sudden on Ubuntu 12.10

Recently, I replaced my network card and had few issues with the new card and the network connection on the office Intel Xeon 5500/Core i7 white box server running 64-bit Ubuntu 12.10. I ended up ...
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171 views

unable to connect to open wifi on a headless Ubuntu on ARM

I have headless Ubuntu 13.10 on a little ARM device (a BeagleBone) with a wifi adapter connected to it. I'm unable to get an IP from DHCP: 'sudo dhclient wlan0' takes a while to run and when it comes ...
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1answer
279 views

DHCP Configuration in ubuntu server 12.04 LTS

I know i can configure DHCP in terminal by installing isc-dhcp-server but what i need is the best GUI program that allow me to configure DHCP settings graphically . Any Suggestion is thankful ?
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7k views

Problem configuring dhcp server: Job failed to start

I m trying to configure dhcp server in ubtuntu onto my virtual box and connecting other virtual instance of ubuntu to this dhcp sever i have installed dhcp server using sudo apt-get isc-dhcp-server ...
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1answer
744 views

LTSP thin client would not login

The situation is: I have created an Ubuntu LTSP 64bit Server with 32 bit clients using the steps in this tutorial. I used Virtual Box machine as thin client using same procedure in this tutorial. ...
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21 views

ssh backup host [duplicate]

I have a pc called MONKEY, when MONKEY is connected to the lan of my network it has ip address 192.168.1.101, when MONKEY is connected to the wlan of my network it has ip adress 192.168.0.107. Now in ...
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28 views

Use Ubuntu Server to create a WiFi acces point

I have configured my Ubuntu-Server as a WiFi acces point following this instruction: http://wiki.ubuntuusers.de/WLAN_Router?highlight=dnsmasq I can connect and authenticate. But I don't want't ...
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269 views

Sharing Internet Connection (DHCP) through a Wireless Hotspot

I have an internet connection through a cable modem. The IP address on the cable modem is not static and is perhaps obtained through a DHCP mode. I wish to share this internet connection through ...
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31 views

How to edit resovle.conf on my own?

I am doing all the networking manually. For example, if I want to connect to a network using DHCP I change the dhclient script file then I read my script then add the ip's using IP command. It all ...
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60 views

Internet connection and external access with two Nics 12.04

I have just set up two nics in my ubuntu 12.04 server. I have eth0 and eth1 both configured to use DHCP. eth0 is connected to my router and the router has access to the internet. eth1 is connected ...
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431 views

Mininet problem in allocating IP address

I have encountered a problem in Mininet. The eth0 is allocated to NAT in Mininet and has a certain IP address to connect to the internet. But when I define a host only adaptor, the IPv4 is allocated ...
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1answer
6k views

How to reserve IP Address in DHCP Server

I install DHCP Server with https://help.ubuntu.com/lts/serverguide/dhcp.html but I need to make reserve IP addresses for specific machine (192.168.1.XXX) and further to assign a name to each machine ...
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1answer
46 views

ubuntu 10.04 DHCP server upgraded and now severe problems

We have an Ubuntu server at work. It acts as a DHCP server for 5 machines connected to a private 172.x.x.x network for internet access. The machines netboot from an image on the server. I tried to ...
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580 views

Can't resolve local hosts

To start with, my Linux or networking knowledge is fairly basic, so it's probably best to assume that I know nothing. I've been trying (for my own furtherance) to put together some sort of home ...
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1answer
125 views

Ubuntu 12.04 LAN settings after changing ISP and modem : The Network Path was not found !

There is probably a very simple answer to this but it has me stumped. I have a Ubuntu 12.04 machine on a windows LAN. Previously I could find the shared folders on the system by using ...
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2answers
1k views

configure dhcp server in Ubuntu 13.10 and other version?

salam (Hi) What is the difference between install / configure dhcp-server in Ubuntu 13.10 and other versions? I see a video about configure dhcp-server in Ubuntu 12 but I can't configure it in ...
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1answer
222 views

408 error in browser using Google or openid on some networks in Ubuntu [duplicate]

I have searched here and the web and many other people have similar issues going back a few years (My Google Account not working properly with Ubuntu for example), but no one seems to have fixed it. ...
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1answer
2k views

DHCP for multiple subnetworks with one NIC

I am trying to run DHCP server on Ubuntu 12.04. I need to configure several pools (different sub-networks) using one interface card. So I have configured below: sudo nano /etc/network/interfaces ...
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106 views

Ubuntu 12.10 won't use dhcp static lease from my router

I have a Buffalo router running dd-wrt (came stock from the factory with it). I have a DHCP static lease setup for my computer which dual boots Windows 7 and Ubuntu 12.10. When running Windows, there ...
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866 views

How to assign unique MAC addresses to sub-interfaces

I'm in a corporate environment with a DHCP server with static assignments for my server. I have one physical nic with several sub-interfaces. I statically assign different MAC addresses for each ...
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1answer
935 views

Why fixed address assigned to DHCP server doesn't work?

I have an Ubuntu server that runs DHCP server. DHCP server works good normally, but when I want to assign fixed IP address for my clients, it doesn't work. My codes in dhcp server in dhcpd.conf look ...
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900 views

How can I stop sending my hostname via DHCP?

Ubuntu sends my computer's configured hostname to any DHCP server it tries to use. How do I stop it from sending a hostname?
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1answer
126 views

What IP address does Ubuntu assign itself when it cannot reach a DHCP server?

When Windows is attached to a network but cannot reach a DHCP server, it defaults to an IP address of the form 169.254.XXX.XXX. Does Ubuntu do something similiar?
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Thin Client Lubuntu over PXE Server with DHCP and TFTP

I have 10 old computers (like thin clients) without HDD. So i decided to use Lubuntu as Operating System. In my work we have a PXE server with DHCP and TFTP, they built a debian distro before and for ...
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MaaS dhcp cannot be detected at node installation

I am installing a MaaS Ubuntu 12.04 by ISO with virtualbox as the host machine. I have a problem on the cluster management during the process of adding the node. The node cannot detect the dhcp ...
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212 views

Ubuntu networking - DNS/DHCP

How to configure Ubuntu 13.04 as my DNS (Domain Name Server) and DHCP server for other Linux client machines? Master server ip configuration- ip address: 192.168.200.100 gateway: 192.168.200.1 name: ...
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2answers
1k views

Ubuntu Server Static IP Problem

Hi I've been trying and trying to chang emy ubuntu servers IP to static so I can have people join my Minecraft server that I have set up, I've been working on it for 2 days straight with no luck, when ...
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1answer
507 views

domain-name dhcp option not applying to hostname -f

My Ubuntu 12.04.3 machine is not getting the domain-name option from dhcp applied to the FQDN returned by hostname -f (dnsdomainname returns nothing). Ip config: # ip a 1: lo: ...
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1answer
2k views

wicd Failed: Unable to get IP address

I have an old laptop (Thinkpad T30) and I have installed lubuntu 10.04 on it. NetworkManager could see the available wifi but the bottom was gray out. It seems that it is an unsolved-bug in wifi and ...
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2answers
482 views

Why is my network broken, although my computer has an IP address, and firewall disabled? [closed]

Short summary (added after the problem was solved) Apparently some wireless USB network adapter drivers were incompatible with my Linux OS, and in the end I worked around the problem by buying a ...
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2answers
2k views

How do I override an MTU provided by DHCP?

I'm running Ubuntu Server 12.04 LTS, and I want to override the MTU my cable company provides via DHCP. They provide an MTU of 576 and I want to use 1492. I can change it with ifconfig, but it ...
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1answer
266 views

Website access only with ip

I recently installed Linaro Ubuntu 12.04 on my cubie development board and I can access websites only with ip adresses, for example I can access google with 74.125.224.72. I also can ping only ip ...
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340 views

Dependency Problems while installing isc-dhcp-server

I'm a newbie in the Ubuntu world. As a result, I'm having some problems with my Ubuntu 12.04 LTS. I have an Android device which I want to connect to my Ubuntu. To make this possible, I am trying to ...
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1answer
2k views

How can i give internet access to local network via DHCP/Gateway server?

I think i now find myself somewhere between cognitive overload and like a babe lost in the woods. Thus i hope someone out there can assist me! :) I setup a Ubuntu 12.04 server on my home local ...
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2answers
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Networking stop/waiting error

I wanted to set up a bridge connection for my VMs (I am using KVM). I modified my etc/network/interfaces file and its contents are: auto lo iface lo inet loopback auto br0 iface br0 inet dhcp ...