DHCP stands for Dynamic Host Configuration Protocol and is an auto configuration protocol used on IP networks and an extension of the Bootstrap Protocol.

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How did AirPort's DHCP “Welcome Message” work?

I remember that Apple's AirPort base stations used to have a DHCP "Welcome Message" feature, that would display a custom pop-up dialog when computers connected to the network. How was this ...
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17 views

DCHP Policies Server 2012R2

Tell me, please, is it possible to define a policy on the Windows Server 2012R2 DHCP which lease IP address to workstations based on the host name? For example, there are a host OFF-CONTOSO. I want ...
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90 views

DHCP reservation for Forefront TMG VPN clients

We have a remote computer connect to our cloud VPN network. VPN server is Forefront TMG. FF TMG is configured to server IP addresses based on the netowork's DHCP server. In DHCP I see leases to VPN ...
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127 views

specific IP Attribution with isc-dhcp-server with freeradius authentication

I would like to assign specific address to my clients, regarding their radius authentication. For exemple, user1 (group user) authenticate on radius, dhcp gives him 192.168.1.1 as IP user2 (group ...
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81 views

Under CentOS6.5, DNS Server build with DHCP, Client can't ping domain-name, but IP can

I'm trying to build a DHCP and DNS server. I check that client ip is ok to capture (11.11.0.1), ping server ip (11.11.0.9) is ok, but ping domain name (example.com) is not ok. On the server, ping ...
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61 views

Using Microsoft DHCP with Linux PXE/TFTP/kickstart

I have a microsoft dhcp server already in the network and i have linux servers for pxe/tftp/kickstart. I would think that it would work using a ms dchp server with pxe/tftp on linux but im not sure, ...
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86 views

DHCP, IP conflict on LAN (pfsense)

On my router I occasinally get a log with multible entries like this. It is a LAN with DHCP so I guess here should be no conflict at all... Is there a nature to this? May 11 09:24:36 220002 ...
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322 views

Configure WiFi and LAN network to use the same Kerio DHCP server

We have a local network in the company: An Ubuntu server hosted for VPS. Kerio Control Appliance 8.5 installed on VPS as internet & DHCP server . WiFi modem connected to eth0 of Kerio. eth1 of ...
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68 views

Virtualbox vm lstp client login blank for lstp server on ubuntu 14.04 , what I'm missing here..?

I am trying to configure a lstp server ( ip of lstp server : 172.16.40.0 ) on a 64bit ubuntu 14.04 and check it network booting virtualbox vm (harddisk less vm) I configured everything according to ...
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154 views

How to configure DHCPv6 and DNSv6 configuration in Ubuntu 12.04?

I'm planning to configure DHCPv6 and DNS server in my network. I would like to understand whether both DHCPv4 and DHCPv6 can be configured using isc-dhcp-server service? When i tried nslookup ...
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173 views

DHCP Server ignores DHCPDISCOVER request

Within a VPN I am trying to implement dhcp. I have the following setup now: DHCP Server (dnsmasq) is listening/should listen on a virtual network interface. The interface is configured as follows: $ ...
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141 views

WES09 Client not registering with dns suffix

I have HP thin clients, some running Windows Embedded Standard 2009, and some running WES 7. They are all getting DHCP addresses from our Server 2012 R2 DHCP server, with AD integrated DNS. With both ...
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36 views

DHCP export using netsh

I'm trying to export a DHCP database using the following command: netsh dhcp server export c:\dhcpdb.dat all However it completes with the error WARNING: Could not obtain host information from ...
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212 views

Setting DHCP hostname with Cobbler

I have configured the DHCP to work with Cobbler in a way that the client will get its hostname assigned by DHCP (by using the option host-name in /etc/cobbler/dhcp.template). It works fine if I run ...
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85 views

Ubuntu DHCP-RELAY Error

I have a Ubuntu 14.04 server running as a router (4 NICs with IP forwarding turned on). The routing/forwarding component is working fine. However, I now wish to implement a DHCP-Relay/IP helper so I ...
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167 views

Use export-smigserversetting vs. export-dhcp

Any reason to use one over the other (export-smigserversetting vs export-dhcp) when migrating DHCP from Server 2008 to server 2012 R2?
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97 views

Hyper-V with DHCP enabled Host

I am trying to set up a Hyper-V enviroment. This is what I am trying to do : Install Server 2012 r2 on the machine as the HOST. Install DHCP, DNS and Hyper-V on the Host Machine. Using Hyper-V ...
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32 views

Unique record per ip address on Windows DNS

I have a little problem with my DNS server under Windows domain. My DNS server gets automatic registration from clients by dhcp. Please consider this situation: Computer PC01 with dhcp address ...
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62 views

IPv6 DHCP for Hyper-V Guests

I have the following configuration: W2K12 with Hyper-V and DHCP Role installed, and I have IPv6 block. The goal is to assign IPv6 via DHCP to guest VMs, and make guest VM to have access to the ...
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48 views

How can I assign an IP by UID in DHCPd

Here was answered how to assign an IP by MAC address. I want DHCPd server to assign IP by UID. Can i just add record to dhcpd.conf in the same manner? For example: host example { uid ...
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46 views

DHCP from Cisco 1921 failing after switch nr 2

I have a network which uses a Cisco 1921 router. The router is connected to a Dell Powerconnect 2848 switch and from that switch is a connection to a small SOHO Planet switch which 3 computers connect ...
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119 views

DHCP relay offer packet dropped

I'm trying to get DHCP relay set up on our Cisco SGE2010P switch. Sadly, we can't afford a catalyst switch right now. It looks like I have everything configured correctly, but something is going ...
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256 views

OpenVZ, veth interface and getting ip from dhcp from the inside of containers

I have OpenVZ server (centos) with one interface eth0, also I have dhcp server in the same network. I need container with ip from dhcp server. So, I created guest node with the veth interface, after ...
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66 views

Windows Server 2008 reboots when DHCP server is down

I have two Windows Server 2008 servers. Both of them have static ips, both of them are domain controllers. The first one run a server based software, the second one is our dhcp server. Some times the ...
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112 views

Windows DHCP client only using one DNS server?

I have a PC running Windows 7 professional. It is a DHCP client. The DHCP server is sending it two DNS servers. This has been verified with packet captures. However, after running ipconfig /release ...
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43 views

Small Office WiFi config for iPhones

I purchased an ASUS RT-AC66u wireless router for use in a small office. I have the router configured as an access point, DHCP is turned off. It is using a static IP of 10.10.10.251. My DHCP server ...
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332 views

DHCP Requests cannot get through Switch

First a little about the network setup: We are a smaller department of a larger school. We have 7 offices with TP-Link managed switches as well as 20 APs and 24 classrooms. The switches, APs and ...
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201 views

Internet drops out randomly for short periods of time (LAN issue)

I run a network (I'm just a math teacher) at my school. We get random 10 or so minute periods (I'd guess three a day on average) where the Internet is not accessible from within the LAN. If I go to ...
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465 views

Why need DHCP Relay (Watchguard) inside the Trusted network?

I run a small network that looks like this: { Win 2008 server , desktops , Wifi AP} -> Switch -> Watchguard XTM21 firewall (the Switch is connected to the XTM's Trusted interface ; the XTM ...
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53 views

Change network mask DHCP server

Currently i have a Ubuntu with isc-dhcp-server running with the following configuration authoritative; ddns-update-style interim; ignore client-updates; subnet 192.168.1.0 netmask 255.255.255.0 { ...
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639 views

OpenVPN Linux Client does not bring up tap0 interface

I have an OpenVPN client on Linux connecting to an OpenVPN server. The server assigns IPs via DHCP, thus I connect using the tap interface rather than the tun interface. OpenVPN connects, ...
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219 views

Clients do not see DHCP Server… what am I missing?

Old router died and just got the new one in and I can't figure out what I'm missing to forward dhcp and dns to windows server 2012. Old router was a netgear R6300, new one is an N900. Before the ...
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142 views

Edge firewall on Ubuntu, dynamic IP address, static DNS

We're setting up a software firewall, and one of the issues we're facing is that eth0 has a dynamic IP address. In /etc/network/interfaces we've got the following: # The loopback network interface ...
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757 views

CentOS DHCP server not updating DNS nameserver on Ubuntu Client

I have a working DHCP server on CentOS, with /etc/dhcp/dhcpd.conf set up as follows: subnet 192.168.1.0 netmask 255.255.255.0 { option routers 192.168.1.1; option subnet-mask 255.255.255.0; ...
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69 views

DHCP Randomly Not Assigning Addresses

Having a strange issue for the past day or so. Some users (probably about a dozen, dozen and a half out of 100 or so) are having trouble pulling DHCP. They are getting the private IP address. If I ...
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161 views

How do I stop a Linux computer from sending a DHCP hostname?

I need to set up a Linux computer so that it uses DHCP but doesn't send any hostname at all. I'm using isc-dhclient-4.2.4 /etc/dhcp/dhclient.conf contains the line send host-name = gethostname(); ...
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85 views

DHCP server with ability to update mac address dynamically

Is there a better way to maintain MAC to IP specification in dhcp with out restarting dhcp service each time when there is an update. is it possible to use DHCP with database in Linux to save all ...
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2k views

CentOS 6.4 - Cant get an IP from DHCP

I have a Ubuntu and CentOS system running on XenServer. The Ubuntu Box gets and IP from DHCP no problem. The CentOS will not take a DHCP but a static address works fine. [root@XenCentOS ~]# service ...
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162 views

How does DNS update work in an environment where DHCP performs registration, and clients may have multiple DHCP leases?

Here are the particulars (all Windows): DNS - Our DNS only stores one A-Record per hostname. Scavenging is not currently enabled. DHCP - DHCP is configured (server level) to perform DNS registration ...
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248 views

Configuring HP Proliant iLO using hponcfg

I am configuring an iLO using hponcfg by logging into the machine remotely and running hponcfg with scripts Mod_Directory.xml and then with Mod_Network.xml. I am enabling the DHCP on the device. But ...
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582 views

name not resolve in vmware client PC

I have configured DNS server and DHCP sever on centos 6.2 vmware virtual machine. I have a windows xp vmware client machine. nslookup command is work in server terminal But it won't work in windows ...
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549 views

Create a DHCP working lab in HyperV (2012) all Internal

I need to create a lab for testing purposes. I got a good desktop on which i have installed a server 2012. In HypverV, i have installed two 2012, one XP and one W8. The idea is that the one and ...
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419 views

How to filter out/disable DHCP NAK responses?

We have some crappy situation where we don't have control over the existing DHCP server on the network and where we need to add another BOOTP/DHCP server with the authoritative directive. Our ...
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191 views

DHCP requests don't get to instance, but they do if I retransmit with scapy

Trying to troubleshoot a problem where DHCP request packets aren't getting into a KVM virtual machine. The DHCP server and the hypervisor are on separate machines, separated by a swich. br100 ...
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2k views

Windows DHCP client and DNS suffix search list (option 119)

I'm trying to supply the dns search list to my windows clients to make the internal DNS naming scheme usable. Windows AD is not used so no GPO available. The ideal way would be to supply the dns ...
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206 views

Clients suddenly stop receiving data from the network

I'm facing a connection problem on a small network: 10 clients connected to a Netgear WNR612v2 WiFi router with DHCP disabled; 4 clients connected to a Linksys WRT160NL router with DHCP active and ...
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16 views

Win Server 2012, Replicate Failover Scopes

I have a problem: I have two Domain Controlers. On DC1 I have fully configured scopes, reservations etc. on DC2 i have nothing (its used only as dhcp failover), however, I want to push my DC1's config ...
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10 views

Hyper-V Generation 2 Network Boot “DHCP Failed”

PXE works on all other computers, as does DHCP. Using Generation 1 with legacy adapter works. Why does this occur with a Generation 2 VM? screenshot
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24 views

Why server shows time out for 5 second then connecting in redhat linux

I have a DHCP server configured in Red Hat linux , there are two NIC Cards there , one connected to LAN and other connected to WAN , But i am losing internet for 5 second in one minute and this cycle ...
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40 views

WDS, separate DHCP, unable to start service

I have physical server with 2 Hyper-V on it. On first, I have DHCP, DNS and of course Domain Controller. Everything is working fine. on second one I installed WDS, I made some boot images but then a ...