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

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No internet access after system update

So I've just install some various updates that shows up. After system reboot I've lost internet access... Please help me with this :( I'm using kubuntu 14.10 on VirtualBox Network Adapter 1 is ...
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Setting up network for two places with different static IP addresses by script

I have a Raspberry Pi 2 and I'd like to use it at home and at work. At home it could get a DHCP address or a static address 192.168.2.x but at work it must get the static IP address 10.10.34.122. I ...
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Static IP v.4 LAN Suddenly Lost Connectivity

Suddenly, on June 15, our static IP v.4 wired LAN lost its Internet connectivity. This is a wired LAN, each device with a static IP v.4 address behind a router, and has worked flawlessly for ...
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Broadcast ubuntu router on network connections

I have configured my ubuntu server to become a router. It has a network of 10.1.10.0. How do I broadcast this network for devices to see it as a choice for a network connection?
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isc-dhcp-server and compiz?

I'm facing a very strange problem. I'm using Ubuntu 14.04 LTS. Everything is normal until I install isc-dhcp-server. When it's installed, my desktop becomes abnormal. All strings (file/folder names) ...
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20 views

Make ubuntu server/router part of wifi connections

So I have configured my ubuntu server to be router with dhcp functionalities and I want it to appear on other computers or devices as a choice for a network connection. My ubuntu router is currently ...
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30 views

Ubuntu server router network connections

Is it possible to make the ubuntu router part of the network connections so my device can connect to it and the ubuntu router can assign an ip address via dhcp. I have already configured my ubuntu ...
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23 views

Ubuntu server as dhcp router/firewall

I have properly configured the ubuntu server to have dhcp service and firewall rules. I also placed some firewall rules for testing. I just do not really know how to test it on lets say another ...
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Output of the Show ipv6 dhcp interface [closed]

I successfully configured the DHCPv6 server. My CPE is also receiving the prefixes. However, I am not to figure out some of the terms in the output of the command "show ipv6 dhcp interface". I tried ...
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DHCP IP Address / sub interfaces

I've setup a DHCP server for about 120 sub networks and it's working very well, it gives the right IPs from the right subnet / VLAN. The server listen to Eth0 which has the IP 192.168.111.20 and all ...
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How to create local DHCP server to give addresses to bridge ports?

How to create and setup local DHCP server(dnsmasq) via terminal to give addresses to bridge ports? For example I have bridge br0 and need to give some address to tap interface that connected to br0. ...
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28 views

Unable to setup a pxe server on Ubuntu VM (Virtual Box)

I am bit new to this and trying to setup PXE server on Ubuntu 14.04 VM using Virtual Box 4.3. For this I have followed following link for my installation. PXE Boot Server Installation Steps in Ubuntu ...
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14:04 Server: dhcpd/bind9 - (Static IP) Clients no longer have connectivity to external hosts

After following the linked guide from a fresh install of 14.04: http://blogging.dragon.org.uk/dns-with-bind9-and-dhcp-on-ubuntu-14-04/ I made an addition to /etc/dhcpd.conf so that I had a group of ...
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42 views

ubuntu isc-dhcp-server expected ip address or hostname

I recently replaced my windows server with an ubuntu one and I was setting up dhcp when I ran into this error whilst trying to add a 'reserved' client. expecting IP address or hostname Jun 6 ...
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Server Network DHCP Fail Kills Interfaces

I have a server with the current /etc/network/interfaces: auto lo iface lo inet loopback auto em1 iface em1 inet dhcp auto em1:1 iface em1:1 inet static address 192.168.168.1 netmask ...
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51 views

How can I connect my PC connected to WiFi on wlan0 to my oscilloscope on eth0?

Here is how I set up my network configuration on both devices For Linux comp: wlan0: WiFi Link set to DHCP eth0: Static IP: 192.168.1.254 Netmask: 255.255.255.0 Default Gateway IP and ...
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How can I see DHCP server current users list

I have Ubuntu Server 12.04 and I installed isc-dhcp-server. It work normally, But I need watch current users list and search user by MAC. There have logs: /var/lib/dhcp/dhcpd.leases But I don't need ...
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dnsmasq giving out IPs in the static range

I have the following in my dnsmasq.conf: dhcp-range=set:red,10.1.1.2,10.1.1.69,72h,static dhcp-range=set:blue,10.1.1.70,10.1.1.100,72h,static dhcp-range=set:white,10.1.1.101,10.1.1.200,12h ...
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How to fix my local ip address [duplicate]

I want my private IP address 192.168.xxx.xxx to be fixed and do not change, Is it possible? I am using Ubuntu 14.04. I need it to work even when I change the network? Thank's
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44 views

DHCP for multi netwok

I hope I well get help as I got always in this excellent forum. We have over 120 networks (192, 172 and 10 ranges)and at the moment our DHCP server is windows server 2008, which I would like to ...
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104 views

OpenVPN doesn't connect on Ubuntu, but works on windows

Cannot deal with openvpn connection. It works on windows, but on Ubuntu linux 15.04 script end 'Initialization Sequence Completed' and unaccessible .local resources. I checked many links and answers, ...
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Firefox/Clementine only use eth0 as gateway but not eth1

hy! I have two nics, that are configured via dhcp, internet is reachable via both: 1) 192.168.15.x gateway 192.168.15.1 2) 192.168.1.x gateway 192.168.1.1 Sometimes 1 is down via the firewall (as ...
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Dynamic IP with static DNS

Getting a dhcp'd IP ok, but DNS is not resolving. 2 part question: using nmcli how can I see what DNS server's I am using? where do I go to configure a STATIC DNS server for a wireless interface ...
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DHCP server on subinterfaces

I have created two subinterfaces on eth0 : eth0:0 with IP 192.168.10.1/24 eth0:1 with IP 192.168.11.1/24 Configured /etc/dhcp/dhcpd.conf like that: option domain-name-server 194.204.159.1; ...
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“Learning” DNS server

I recently used a Raspberry Pi as a router, including services like DNS and DHCP in addition to nat. "dnsmasq" works really fine, resolving the IP addresses stored in /etc/hosts. But it can't ...
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Landscape's OpenStack installation fails due to containers unable to obtain an IP

I followed this instructions and the instalation failed while deploying Landscape. I dug it up a bit and found that the juju containers are unable to obtain IP address: Apr 28 16:20:50 ...
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how do I configure dhclient for comcast /64 prefix?

I did have everything working, but when I updated my router to a supported version of ubuntu, it broke (Ubuntu 14.4) Where things go wrong is dhclient never grabs a /64. It either gabs the IP for ...
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56 views

DHCP Stopped working over Bonding

Something recent broke DHCP and Bonding. I used to be able to do this: # This file describes the network interfaces available on your system # and how to activate them. For more information, see ...
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how to set set up TFTPD and DHCP for PXE like booot

I am trying to setup tftpd and dhcp to assign IP address to router and then to pass the server and path to kernel image, which will be booted. All the guides I have located tell me to install and ...
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Try DHCP first, if it fails assign static address and use the machine as a DHCP server itself

As the title says, I have a tiny screenless Ubuntu server that I move around, that has two different behaviors and needs to adapt automatically, that is, without any human intervention, at bootstrap: ...
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Ubuntu 14.04 as router Destination Network unreachable

I am fightning with this for like 10 days now i really need to ask you guys, i hope someone has 5 mins time to explain me what i am doing wrong! For the start i wanted to configurate a router for my ...
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isc-dhcp-server: dhcp dynamically update dns records

i'm trying to dynamically update DNS records when DHCP give out addresses. but even though I have specified allow-update with a key in /etc/bind/named.conf.local and specified the same key in ...
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Reset DHCP IPs to beginning of range

Kind of a silly question, but I'm just curious as to how you'd reset the DHCP range of your server back to the beginning of it's designation. I've tried restarting the DHCP service, but to no avail. ...
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91 views

Dnsmasq and Iptables for routing

I'm using a Raspberry Pi with two ethernet ports as a router. The network looks like this. "Internet" <--(…)--> Fritz!Box <--(172.16.x.y)--> [eth1, dhcp] Raspberry Pi [eth0, static] ...
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beyond MAC address spoofing

Saturday, I am going to have to attempt to connect my notebook to a network that does not like me much. It is a school network. I work there as a volunteer, but don't have a sysadmin to explain what ...
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Hostapd with localhost server

I have hostapd and isc-dhcp-server working on my linux 14.04 box. My WiFi devices can find the hotspot and are assigned an ipaddress. At this point there is no connection through to eth0. I also have ...
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40 views

Set up A- and PTR-records automatically

is there a way to make the DNS or DHCP server to set up the A-record and PTR-record for each IP in a subnet? instead of adding one by one? thanks
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The dhcpd.leases file

At home I run my own Ubuntu 14.04 DHCP/DNS server. This is working well and I really like Linux as my DHCP server since normally I work with Windows DHCP servers. I really don't have much experience ...
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Yardi on Ubuntu, Patric, digitalbeachbum

I am trying to run an old DOS real estate management program Yardi 4.0 on ubuntu. Has anybody done it successfully? I had read a post here from a user 'digitalbeachbum', Patric, earlier last year ...
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How to setup Multi Dhcp Server

I'd configure isc-dhcp-server and its works fine but now we are running out of range as we are exceed 255+ active devices. Current configuration: eth0: 192.168.0.1 I want to setup following things. ...
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DHCP on commit script not running

So I have a basic DHCP set up - option subnet-mask 255.255.255.0; option broadcast-address 192.168.0.255; option routers 192.168.0.254; subnet 192.168.0.0 netmask 255.255.0.0 { range 192.168.0.15 ...
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151 views

ISC DHCP Different DNS Server For Different Client OS

Is it possible to configure isc-dhcp in a way that it can send different DNS server addresses to different clients in the network? Let say I have some Macs, PCs with Linux and Windows in the ...
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133 views

Can't set a permanent static IP address through network/interfaces

I'm running Ubuntu 12.04 on a laptop computer that always lives in my house and for which I would like to set a static IP address (so I can access it remotely). I have tried following steps outlined ...
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68 views

assign static ip address on the server, or based on MAC address?

For an Asterisk VoIP server, is there any technical advantage to setting a static IP address directly on the server, versus using DHCP and having the DHCP server (router) assign a static ip address ...
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How to find a printer on another subnet

I have a server with 4 ethernet ports: 1 used to connect to internet and 3 others used to manage 3 local subnets. I configured the DHCP server, the routing, packet forwarding for IPv4 and NAT; ...
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Ubuntu DHCP For real time devices

I have a cisco switch (2960 series) and a cisco router (1800 series). In the switch I have configured VLANS 10 and 20. I am trying to setup a Linux (Ubuntu) dhcp server that will assign IPs to each PC ...
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Unable to run 2 ethernet connections at the same time

I have a workstation with the two ethernet ports (eth0, eth1), the problem is that i cannot run with both ports up and running. I can run with either one of them, but not both. auto lo iface lo inet ...
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Installation of Ubuntu server with proxy settings

I have been installing the Ubuntu 14.04 server. During the installation process, it asks for network configuration. I have proxy set up in my college campus hence I donot know about the IP address ...
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Ubuntu 14.04 DHCP client not updating Windows DNS

We have a set of Windows 2012R2 domain controllers which provide DNS and DHCP service for the network. I have an Ubuntu 14.04 server which is getting addresses via DHCP. This works correctly. In the ...
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DHCP server not running

I have this : $ sudo service isc-dhcp-server start isc-dhcp-server start/running, process 7202 $ sudo service isc-dhcp-server status isc-dhcp-server stop/waiting I have two interfaces (eth0 and ...