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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Multiple DHCP servers [duplicate]

In what circumstances should you configure multiple DHCP servers on the same subnet? My understanding of using more than one DHCP server is that your clients will use the nearest DHCP which could be ...
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1answer
478 views

How can I set one hostname and IP for multiple MACs in DHCPd (isc-dhcpd-4.1.1-P1) on CentOS 6.x?

I am trying to get my DHCP server (isc-dhcpd-4.1.1-P1) in CentOS to give the same IP and hostname to two different MAC addresses (LAN and WLAN) on the same computer depending on which is connected.. ...
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1answer
127 views

How can i prevent TINC from relaying DHCP

I am running tinc in several NAT routers running Debian 7 Wheezy, the VPN works fine for months, except because i've set it up in switch mode it relays DHCP requests and answers over all the VPN. The ...
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2answers
72 views

How do I set up my office network so unqualified domain names resolve as if they have a default suffix added?

I want to type "go/something" in my browser address bar, and have my browser request "http://go.mydomain.com/something". The use case is where go.mydomain.com is our internal URL shortening service, ...
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1answer
57 views

DHCP wont release allocated IPs [closed]

I have a TP-Link td28151 router and I am using DHCP. I need to connect 40 devices to my router by Ethernet. I have set the count of my clients to 100, and my subnet mask is 255.255.255.0. I have ...
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1answer
638 views

Binding DHCP scope to particular network card

I have a windows 2012 server running DHCP. This server has in two network cards. I need to assign Ip addresses across two Vlans. Can this server be configured to assign addresses via scope1 via ...
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0answers
72 views

BMC nics are blocking DHCP offers from reaching target nic

In our environment we have a range of Dell and HP servers with two mac addresses for one interface, one mac for the BMC and one mac for the nic itself, but they share the same physical interface. ...
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2answers
145 views

DHCP complicates using IP Address Source in Amazon EC2 Security group settings

Background: I am learning to setup my amazon web services account. I watched a video tutorial(http://youtu.be/-xVyuLJZFYc), where they mention that within the security groups dashboard, one could ...
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1answer
192 views

How to configure linux DHCP servier for MPLS?

We are set up with a two-branch MPLS with a DCHP Helper on the Remote subnet. The DHCP service is running on a CentOS box. So I have two subnets: HostRange: 192.168.0.1 - 192.168.1.254 ...
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1answer
239 views

Building a Windows Server 2008 R2 (DNS, DHCP, AD, etc…) [closed]

I'm looking forward to build my own Windows Server 2008 R2 machine for a company that is in the process of establishment. I have some questions regarding the Windows Server. I'm pretty new to it .. I ...
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3answers
227 views

Can I run a single DHCP Server for all branches of an MPLS?

We have a two-location MPLS. I am told by the ISP that I can have a single DHCP server to service both branches. But I don't understand this. Consider this: Location1 (Host branch with the DHCP ...
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1answer
2k views

Move DHCP Scopes to existing DHCP Server

We have a remote Domain Controller that is running Server 03'. I'm wanting to retire this box and move to the 03' box that we have locally. I was looking at this guide, but wanted to ensure that it ...
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0answers
58 views

Cisco 5508 - One WLAN not pulling from Windows DHCP

We have an existing Cisco 5508 doing all our WLAN/WAP functions. Windows 2008R2 DHCP server. There are currently 4 WLAN's, functioning properly. We are running out of addresses on our corporate ...
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1answer
160 views

Using isc-dhcp-server to allocate addresses from subnet different from server subnet

I'm trying to break my network into different subnets. Server is located into 192.168.15.0/24 subnet. I have the following declaration in my dhcp.conf: subnet 192.168.15.0 netmask 255.255.255.0 ...
2
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1answer
603 views

Very long 'Unique ID' in Windows 2008 DHCP Server Leases - why? What is the device?

I notice on one Windows 2008 R2 DHCP server the device with the first IP in the range has a strange looking Unique ID of the format ...
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1answer
153 views

share OpenVPN tunnel to other machines and multiple DHCP server concern

I'm thinking about trying OpenVPN on a particular host to tunnel traffic to a VPS. As well, I'd like to get arbitrary clients on my LAN to use that OpenVPN interface for routing their traffic. My ...
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1answer
270 views

Is there any difference between DHCP helper & DHCP relay agent [closed]

The DHCP helper is the device that knows where the DHCP server is The DHCP agent knows where the helper is on the network and points a device to the router or switch ..
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0answers
243 views

2 DCHP servers and 1 WDS server, same subnet

I have DC1 hosting DCHP. DC2 also has DHCP although it is configured as a failover DHCP server. I have WDS installed on DC2. So I have DHCP and WDS on same server. I have tried all kinds of DHCP ...
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1answer
50 views

Determining if imaging is required with WDS

We are a business of under 200 PC's that are looking at implementing preventative maintenance tasks such as regular imaging or updates but would like to see if there is a better method then IT coming ...
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1answer
147 views

Can Windows Server 2003 DHCP Server assign multiple IP Addresses to a single host?

I have Windows 2003 Server handling DHCP for our network. We use reservations to assign some hosts IP addresses. Is it possible for the server to assign a single host two IP addresses in different ...
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1answer
649 views

Shouldn't we exclude a static IP from the DHCP pool?

In my office, I have a printer with static IP 192.168.0.254/24. Normally, it should be excluded from the DHCP pool in the router. So I just set the DHCP pool to be in the range of 192.168.0.2/24 - ...
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2answers
777 views

Force DHCP Reservation Updates to Secondary DHCP Server in Windows Server 2012 R2

I have setup and configured two DHCP servers on my private network in load balancing mode as outlined in the following technet article: http://technet.microsoft.com/en-us/library/dn338979.aspx Both ...
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1answer
36 views

2 NICS using Windows Server 2012 as “gate”

I want to use my windows server as a gateway and DHCP for my local network. It have 2 NICs where one will be connected to the internet and the other to my local network. There are no router on the ...
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0answers
243 views

Libvirt providing bootp options without being configured to do so

I have a virtual network configured in libvirt and configured to provide DHCP (via dnsmasq) but not configured to provide bootp information (see below), but when I boot an iPXE ISO and look at the ...
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1answer
47 views

DHCPD: permanently leased IP being offered (twice) to random node and assignee

Greeting. On a small LAN (< 20 networked devices) with a cento6 5.9 server/dhcp-3.0.5-33.el5_9). I am configuring permanent leases thusly (dhcpd.conf, partial): range 10.115.64.60 ...
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1answer
398 views

Cross-VLAN sharing and auto-discovery of selective resources

I have a network with several VLANs that each contain resources or clients with different access rights. For simplicity, let's say I have 3 VLANs: ID 10: Contains privileged clients and private ...
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1answer
113 views

Migrating from static IP adresses to DHCP

I've just landed my first job as a sysadmin, and my workplace is still using static IP adresses. Informations about adresses are kept in a textfile that is not up to date. So, my first task here will ...
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220 views

Configuring an IPv6 FreeBSD router works on boot only

I am trying the following: I am having a DHCPv6 server (machine A) with a /48 subnet which will delegate /64 subnets to other routers using the prefix delegation mechanism. One of these routers is a ...
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1answer
51 views

Is there a Linux DHCP server that supports assigning different DNS servers to a given host?

Is there a DHCP server that runs on Linux which will allow me to configure what DNS servers get assigned to which host? E.g. If I have 192.168.0.10 and 192.168.0.20 on my network, I'd like to make it ...
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0answers
386 views

DNS A records disappear, but PTR records still remain

We've been having issues with DNS records dropping. Usually it is from DHCP reservations, like printers. Yesterday it was two of our main servers, also DHCP-reserved. Right now I'm looking at a ...
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1answer
147 views

Cross over cable network with DHCP On in one machine [closed]

Network novice here. I need to setup a small network (cross over cable) between a windows server 2008 and Raspbery Pi. And I need to have DHCP service running in my windows server and it should assign ...
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411 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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0answers
91 views

DHCP fault tolerant servers: Split spool or failover?

I need to replace an aging DHCP server by a fault tolerant solution. I consider using the ISC dhcp server solution which can be setup either as split servers serving non-overlapping ip ranges or as a ...
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1answer
141 views

dhcp dns not resolving queries

I having been working through a lot issues with a setup and I reached another where I may have been staring at it for too long to see the issue. The server is reachable from the outside world. ...
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1answer
223 views

send message to connected computer when IP obtain from DHCP Server

If a computer running Windows gets a IP address from DHCP Server, how could I send a message to that computer. Say DHCP Server running from Ubuntu Server. I am guessing through SMBClient? Or is this ...
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1answer
277 views

Add IP address to Ubuntu 13.10 and separate webserver requests

I've got a Ubuntu 13.10 VPS server with 1 IPv4 (111.111.111.111) (and 1 IPv6 address). I recently requested an extra IP address (222.222.222.222) but I can't seem to figure out how to add the new IP ...
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66 views

coova and dhcp server running on same device?

I need to run coova on a device that does not easily disable it's built-in DHCP server or the IP address on the WiFi AP interface facing the WiFi clients. This means both coova DHCP and device ...
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2answers
144 views

client's not receveing internet with dhcp. does if i use static

i reloaded my ad, dhcp, dns server 3 day's ago. server 2008 enterprise. and we are having a problem. only the server issue's the ip. all files share's, ad, etc works. can ping and remote desktop ...
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0answers
66 views

How to setup metric for routers on CentOS DHCP server

I have a simple DHCP server running on CentOS 6 with the following configuration: subnet 192.168.1.0 netmask 255.255.255.0 { allow booting; allow bootp; ddns-update-style none; range ...
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0answers
97 views

How can I find which application is changing my routing table? [closed]

My setup is: Panda <--> PC. PC runs DHCP server. Panda gets IP settings from PC. After DHCP is done Panda has the following routing table: Destination Gateway Genmask Flags ...
2
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2answers
267 views

DHCPD clean leases on client disconnect

Is there a way to force ISC DHCPD to trigger expire or release for static lease right after client disconnect? I want to trigger a script right after client connects ("on commit" DHCPD event) and ...
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3answers
144 views

Prevent IP conflict from untrusted network machines

I maintain a small LAN (192.168.1.0/24) on which we have several untrusted machines, where the users of those machines have administrative rights or are able to connect their own machines to the ...
3
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1answer
298 views

Windows 2008 R2 DHCP - client renewing too frequently

We are running a Windows 2008 R2 DHCP server. We just added a new DHCP server and removed the old one about three weeks ago. I have an employee who is reporting IP conflict errors every day now for ...
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1answer
72 views

PXE Booting: Default boot file name?

When implementing PXE booting, is it necessary to specify a specific boot file in the DHCP options, or can you have a default boot file and so not specify that option?
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1answer
340 views

Push hostnames to a DNS server without DHCP

Considering the complete lack of luck I've had googling any terms related to this question, this may not even be possible, but: Is there a reasonably standard way to set a hostname on a machine, and ...
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1answer
113 views

Multiple DHCP servers on a single physical network?

Today i got put on a project to solve a networking project for a friend who rents out multiple office suites. Internet is provided to all suites in the rent cost. The guy who originally set everything ...
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2answers
94 views

Assign private IP via DHCP + public IP

I would like my Ubuntu VM to have both a private IP and a public IP. The private IP should be supplied by my DHCP server. Currently I am trying this: auto lo iface lo inet loopback # The primary ...
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1answer
112 views

Enterprise DHCP server solution? [closed]

I have a network of about 1000 assorted devices, all of witch are running by static IP addressing. Given the size of the network and the lapse of technical advice, the addressing scheme is in chaos ...
2
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1answer
4k views

What else does “netsh int ip reset” do?

According to this KB article when you run the "netsh int ip reset" command, all it does is to reset the content of two registry keys: SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\ ...
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2answers
702 views

PXE DHCP configuration with existing DHCP server

How does a DHCP service need to be configured, so that it handles PXE requests while there is still another DHCP server on the network? I managed to set up a working PXE system in a separate ...