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 to save DHCP option 43 on Windows 2008 server?

I need to retrieve the DHCP option 43 from my DHCP server (Linux ISC DHCP server) on a Windows 2008 server (or any other Windows version, as long as the code 43 is specified in the Parameter request ...
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Windows 7 Client gets incorrect IPv6 Prefix Length

I am currently setting up IPv6 and DHCPv6 for Server 2008 R2 on my private network for testing. I was able to get DHCPv6 to work by configuring a static, then setting up the scope. I was also able to ...
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3answers
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Clonezilla-SE with another DHCP Server in LAN

I want to install Clonezilla-Server(192.168.1.100) in a network that already have a DHCP Server (dd-wrt with dnsmasq - 192.168.1.1). I've installed Clonezilla-SE on ubuntu Server 10.10, once installed ...
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Configuring a DHCP server to serve multiple subnets on the same VLAN

I have a VLAN composed of multiple subnets, and I would like to use DHCP to centralize IP address designation. The DHCP server (100.100.25.88) is a Debian machine on the subnet 100.100.25.64/27. I ...
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SuSE machine broadcasts for dhcp lease before link becomes ready

The machine is running SuSE 11.2. I configured it to connect use DHCP by using the YaST2 graphical networking interface. When I dhcpcd -k eth0 and then dhcpcd eth0 then I get a lease almost ...
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1answer
9k views

Windows 2008 R2 DHCP server not responding to DHCP discover

I've got two Windows 2008 Enterprise R2 servers both running DNS and DHCP called cod & lobster. DHCP is setup using the split scope option introduced with 2008 R2, whereby both servers should ...
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1answer
111 views

How to generate DHCP Decline scenario / packets

I have a dhcp packets sniffer, which needs to log if it sees dhcp decline response coming from client.I need to know the scenario where client can send dhcp decline response to dhcp server. I tried to ...
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WiFi access point without internet access - iOS devices disconnect

I'm trying to configure a WiFi access point to offer a web service on the local network, without offering clients internet access. The web server has a fixed IP address (let's say 192.168.2.2) and for ...
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2answers
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CentOS 7 is not setting my gateway from DHCP

I have a Minimal Install of CentOS 7. I have disabled the Network Manager as I want to setup my network the "old school" way. systemctl stop NetworkManager systemctl disable NetworkManager ...
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357 views

Configure and monitor Windows 2012 DHCP server with Powershell

We've recently been working with the documentation here to set up some access policies for a new DHCP server. I've been able to successfully import 600+ records with the Set-DhcpServerv4Policy -Name ...
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Have DHCP use different scopes based on MAC address using Server 2012

I'd like my Windows 2012 DHCP server to give ShoreTel phones IP addresses from one scope, and everything else IP addresses from another scope. For example, I'd like to give phones IPs from 192.168....
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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
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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\ SYSTEM\...
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1answer
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Understanding DHCPv6 Stateful Solicit message

I have been reading the full RFC 3315 and trying to generated spoofed nodes to ask for IPv6 address. (only for practice) Right now, I have a Ubuntu with wide-dhcpv6-server (the DHCPv6 server), one ...
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1answer
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DHCP reply packets do not make it into KVM instance in OpenStack

I'm running a KVM instance inside of OpenStack, and it isn't getting an IP address from the DHCP server. Using tcpdump, I can see the request and reply packets on vnet0 of the compute host: # ...
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1answer
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Configuring VPN on Windows Server 2008 with no DHCP

Please see the revised section at the bottom as the original question seems to have been a little convoluted I have a cloud based virtual machine from my client's hosting company. The sole purpose ...
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1answer
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IP served by OpenVPN doesn't take ipp.txt into account

I'm facing some troubles right now with an OpenVPN server an former colleague set up (I'm not too into it ATM). We're using OpenVPN for a private network of ~200 clients (to be more specific, only 15 ...
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how to fix “no free leases” issue in dhcp3?

I am facing no free leases issue. I am building a new server. I have successfully installed ltsp. Then, I configured the dhcp. This is my dhcpd.conf file. option subnet-mask 255.255.255.0; option ...
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1answer
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Ubuntu 12.04 Server static ip configuration

I had some trouble getting the static ip configuration right for Ubuntu 12.04 Server. Every time I would restart the server the nameserver settings in /etc/resolv.conf would get overwritten by dhcp ...
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2answers
988 views

Basic networking: Centos Server Router + Ubuntu Client setup.. unable to access outside world from client

I am trying to set up my Centos Server with two NICs as a router. eth0 is connected to the outside world and eth1 is connected to an Ubuntu client. Here's eth0 on the server: DEVICE=eth0 BOOTPROTO=...
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510 views

Moving to DHCP relay with our Cisco routers and Windows 2008. How to transition smoothly?

We currently have a pretty simple setup. We have a 2008 Windows Server using DHCP for our clients. We have a remote site that has 10 people. The remote site currently get their IPs from the router, ...
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New set up DHCP Server on Server 2008 R2 won't work, Event-ID 1046

I just set up a 2008 R2 as DC, and DNS. Both worked fine, DNS works fine forward and reverse lookup. Now I wanted to install DHCP. As soon as the installation of the role is finished, I get this ...
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1answer
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osx 10.6 dhcp client-id option

Trying to join a osx machine on a dhcp network which forces certain client IDs. Even if I was to modify the client-id via the network properties, the DHCP server is not accepting this request, since ...
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1answer
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unable to block DHCP and other traffic on INPUT chain

Here is the output of my iptables-save command. The last rule and default policy is to DROP any packets that dont match any thing. Generated by iptables-save v1.4.9 on Wed Aug 3 21:00:05 2011 *filter ...
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Windows 7 Machines do not take reserved IP address from DHCP

I have NETGEAR router - WGR614 V6 and have mixed network of Linux machines and windows PCs. I use the router's in-built DHCP. I use 'Address Reservation' feature of the router to reserve IPs based on ...
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2answers
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How to use auto-discovery with iDRAC Enterprise?

All I want to do is: have "auto discovery" enabled on my iDRAC enterprise at the factory rack the server, cable iDRAC to dhcp-enabled management network have the iDRAC DHCP, find the "Provisioning ...
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1answer
949 views

How to specify which DHCP server to get the name server from?

I'm using Debian Lenny with two ethernet network cards, one plugged into a different network. My goal was to set both interfaces to DHCP, but I want the name server to be gotten from only one of them. ...
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1answer
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Windows 2003 RRAS keeps giving me a APIPA 169.x.x.x address

I've got a box running Windows 2003 Server at home. I have configured RRAS so I can VPN to my home network from an outside location. The home-LAN uses the 192.168.2.x IP-address range. Once I ...
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1answer
32 views

Search option in resolv.conf getting overwritten by prepend statement in dhclient.conf

I have setup a DNS server for my department which is running FreeBSD 10.2. It is currently connected to the campus internet and receiving its address via dhcp, so /etc/resolv.conf looks like this: #...
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How to create DHCP reservations with long hardware address?

DHCP is managed by a Windows 2008r2 server. I want to convert a lease into a reservation so the IP will be fixed. Normally, I create a reservation based on the assigned IP address, and when the lease ...
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Cannot renew DHCPV6 lease in SLES12

I need to renew the lease of a certain SLES12 box. The machine is configured to use IPv6 only and so far I have tried the following: From here: dhclient6 -r -v eth0 && rm /var/lib/dhcp6/...
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Did I cause this DHCP failure?

I asked this here, it was requested that I move it to this forum instead. I have a question that I need some counsel on concerning DHCP and what may happen in a certain situation. I have a case ...
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84 views

Authentication and logging of users for a Wireless ISP?

I have to upgrade a Wireless ISP's (WISP) network. Their current setup consists of a router (Mikrotik RouterBoard 1100AHx2), Ubiquiti Rockets (with sector antennas) for clients, and Ubiquiti ...
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1answer
145 views

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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1answer
83 views

Reaching out DHCP relayed hosts

I have one primary server (DHCP) and one secondary (DHCP-RELAY). Majority of hosts are served from primary (wirelessly), however there are a few (wired ones) which get their IPs from secondary. ...
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Client see Windows Deployment Services but still get “selected boot device failed” error

Like the title says I can't Windows Deployment Services working. The client laptop has an ethernet IP address of 10.0.4.94. On the secondary DHCP server I've set option 60 to PXEClient, option 66 to ...
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Is there any difference running dhcrelay with multiple process or single process?

I want to ask about dhcreay running mechanism. We can run dhcrelay with two command, then it will run as 2 process dhcrelay -i eth3 172.16.17.3 dhcrelay -i eth1 172.16.17.5 #ps ax | grep dhcre 26464 ...
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1answer
356 views

NAT box load-balancing with iptables and 4 DHCP uplinks

I am trying to configure a router which provides Internet to a couple hundred users. This router has 4 basic cable uplinks at its disposition, which all use DHCP and have a capacity of around 10/1 ...
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How to extend IP Range from 192.168.1.1 to 192.168.2.254

Here's my question. I currently have a network setup to have Static IP manually assigned between 192.168.1.1 and 192.168.1.99 and the rest (192.168.1.100 through 192.168.1.254) assigned automatically ...
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/32 subnets on Ethernet via DHCP

Is it possible to assign to an ethernet host via DHCP a subnet mask of only the host itself, e.g. 192.168.1.123/32? Do common operating systems support this kind of configuration? I'd like for the ...
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3answers
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DHCP Relay vs Multi-Homed DHCP Server

I'm sketching out a new network topology and I'm unsure of how to solve the issue of DHCP between two VLANs. 10.50.2.0/23 will hold the majority of our users, corporate wifi, printers etc. 10.250.3....
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2answers
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Why won't dhclient use the static IP I'm telling it to request?

Here's my /etc/dhcp3/dhclient.conf: request subnet-mask, broadcast-address, time-offset, routers, domain-name, domain-name-servers, domain-search, host-name, netbios-name-servers, ...
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How to give static IP in the office and use DHCP at home

There is a laptop running Windows XP. When the computer connects to the Wireless network in the office it should have a static IP address (because it's used as a small DB server). When it connects ...
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How to properly nest a wireless router behind a wired router? [closed]

I wish to repurpose a wireless router to serve as a wireless access point behind a wired router (serving as gateway to WAN) so that I don't have to buy more hardware and recapture value on prior ...
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Server 2003 DHCP for home network [closed]

Hey Guys I'm more of a "StackOverflow" kind of guy, so the server stuff kind of eludes me. I have been having some serious issues with my router going down in the middle of the night lately, and I'm ...
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Server 2003 takes alot of DHCP addresses, althought DHCP is disabled

I have a problem where Windows Server 2003 takes lots of DHCP addresses althought there is only 1 NIC in that server and with DHCP disabled (see information below). However, as you can see, MAC ...
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Building linux infrastructure that similar to windows solutions

I am working on Microsoft gold partner organization in last 3 months. All of our IT solutions based on Microsoft products. Here are the basic lists of products that we using our maintenance DHCP ...
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two DHCP servers on the same network - possible?

On my network, I have 3 remote sites and one local that all receive DHCP through our central dhcp server. all the sites have ASAs with dhcprelay and so on. I have two domain controllers - is it ...
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3answers
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Can i configure dhcp on windows server to assign fix ip address all the time

I re-framed my question for better clarity http://serverfault.com/questions/110835/automatic-allocation-on-windows-dhcp-server Is there a way to configure dhcp server to give same ip address to NIC ...
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Two DHCP server in the same subnet

So I change jobs recently and in this new workplace I've found that we've actually got two DHCP servers. In the very same subnet, and they both have the same scope. I did not set up this but I see ...