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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Windows Server 2012 r2 standard with dual NIC + DHCP

Currently I have a physical host with Windows Server 2012 r2 standard installed and DHCP role enabled. In addition the physical host has two network interface cards. I am planing to connect the ...
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17 views

Configuring DHCP server (Win 2012)

I am trying to do some basic testing of a DHCP server (Windows Server 2012). I'm trying to do all this testing from a laptop. The VM's are set Host-Only (or 'Private to my Mac' setting) To get ...
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23 views

TFTP boot file download aborted during PXE boot up

I'm using OpenDHCPServer together with OpenTFTPServer in order to try out network booting. My problem is after acquiring IP address client starts downloading the boot file and halts. Message in TFTP ...
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15 views

“Add Server” in MMC not showing fqdn. Any ideas?

and Nothing is "broken" but my curiosity (and sadly O.C.D) has my wondering why when I add another server through MMC it doesn't show the fqdn of the "added" server, just the hostname. Tutorials ...
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11 views

dhclient: No broadcast interfaces found, but eth0 is up and broadcast

I'm experiencing a common problem with dhclient. But I wasn't able to find a clear solution to this problem. System: ReadyNas RN104 Stock Debian for armhf Just upgraded to Debian Jessie (now ...
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1answer
18 views

Why are DHCP request and acknowledgment messages broadcasted and not unicasted?

In 'Request' part of the DORA process, IP and MAC address of the DHCP server is known to the client (as the IP datagram sent in Offer has this information). So if the destination is known, why is the ...
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19 views

Ubuntu MAAS: PXE only booting two nodes at a time

I'm currently setting up an Ubuntu (15.04) MAAS (1.7) cluster for the first time. It seemed quite straight forward and I even figured out how to boot VMs running on vSphere, so I have a nice testing ...
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3answers
40 views

How would a PCAP filter look like to capture all DHCP related traffic?

As I understand it, for IPv4 I would need to capture UDP port 67 and 68, ARP, ICMP echo request and reply, and for IPv6 I would need UDP port 546 and 547, all DHCP-related multicast addresses, ...
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1answer
34 views

Why is my DHCP pool not working?

I'm trying to create a configuration and it's doing most of what I want it to do, but the DHCP pool isn't assigning addresses. Here's the config so far: enable config t hostname xxxxxx enable ...
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2answers
146 views

Using the VLAN of a bridged switch

In our building, we have 2, 6509 core switches, one for our company, and one for another. We have a vlan configured with a /30 which bridges the 2 switches. Both of us are on separate /16 networks. ...
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21 views

Event ID 1340 - DNS registration for DHCPv4 Client & DHCID has been denied (DHCP Name Protection)

Event ID 1340 warnings are consistently being logged on a Server 2012 R2 domain controller in the System log whenever Apple/Mac clients connect to the network. Here's a log example: Log Name: ...
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23 views

request ip from dhcp

I'm automating a deployment on a vmware esxi host using some custom shell scripts and I would need to know in advance the IP this VM is going to get from a DHCP prior to it being installed. I know ...
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3 views

How to skip DHCP if no cable connected to ethernet in Debian [migrated]

My Bananian Linux is wasting time at logon trying to get a DHCP lease for eth0 interface which is not connected. Well, the extender cable is connected to it, but nothing is on the other end. I have ...
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27 views

What happens when “Auto state switchover interval” is less than “Maximum client lead time” in DHCP?

I was wondering what happens when "Auto state switchover interval" is less than "Maximum client lead time" in DHCP? The question was raised after reading definitions of MCLT & ASSI: Maximum ...
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1answer
28 views

Linux DHCP server to provide unique options to each DHCP request

I am running a DHCP server in CentOS 6.5 and in my network, 3 clients can issue an DHCP request. The host needs to send the address of the tftp server and also the name of a config file. The order in ...
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15 views

How to configure dhcp request witch option 82 on port 10067 of server?

I have snr2960 switch and i need configure dhcp request witch option 82 on port 10067 of server ? Switch is cisco-like, and i configure this: switch(config)#vlan 1 switch(config)#vlan 3 ...
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1answer
30 views

Is it possible to set a dhcp option 77 value in vsphere as a config parameter so vNIC ROM (e1000/vmxnet3) uses it during PXE?

I'd like to set a dhcp option 77 string value in vsphere as a config parameter on a vm or vm template so that the vNIC ROM (e1000/vmxnet3) uses it during the DHCP part of PXE. My goal is to have PXE ...
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1answer
25 views

Symmetric DHCP failover configuration

I have set up a DHCP server on CentOS 7. It runs beautifully, however due to business demands, we are expanding to another site far away. This gives us the opportunity to host a failover DHCP server ...
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1answer
12 views

is it possible to use cobbler using windows dhcp server or without dhcp?

I want to configure cobbler in my network but my network already managing by a windows 2k8r2 dhcp server. Is it any way to configure without dhcp server ?
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33 views

Setting up stateful DHCPv6 on Linux

I want to set up a DHCP server on my local network for IPv6 that issues addresses and further information like DNS/NTP and so on. From my ISP I got the IPv6 Prefix which I will refer to as in further ...
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2answers
65 views

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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1answer
30 views

No internet access for client static ip on linux dhcp server

We are using a dhcp server configured with isc-dhcp-server on debian 8 in a small office network. The server has two network adapters one is connected to a pppoe modem and the other is connected to ...
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77 views

AD DC for domain could not be contacted

We are using samba4 on Debian 8 as a AD DC and isc-dhcp on another Debian 8 machine as a DHCP router. The problem is that if I set dhcp ip on a windows client I can't join the domain. If I add the AD ...
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18 views

Why Windows not get DHCP properly?

I have a VM that installs Windows Server 2008 R2 Enterprise. It configures both DHCPv4 and DHCPv6 clients. The VM locates on an isolated network, where a dnsmasq offers both DHCPv4 and DHCPv6 ...
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38 views

pfsense NAT router - “live with” double nat (airport express)

I have a setup that have worked for years with a fiber to a NAT router to clients. Clients are typically cheap NAT routers of any kind. Setup like this Fiber from ISP | Router, pfsense -WAN - ...
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64 views

How to configure dhclient on CentOS to get IP from a specific DHCP server

I have a situation where I am able to launch CentOS 6.6 images on a subnet such that the VM instances get their IP addresses from the virtual gateway of the subnet. Now this gateway has gone wonky and ...
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1answer
66 views

Multiple DHCP servers in multiple subnets, one DNS server

I have existing network with two subnets - one is the main company subnet (192.168.1.0/24), the other is completely separate VLAN for Guest Wireless and BYOD devices (192.168.2.0/24). There's Windows ...
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1answer
30 views

Is it possible to configure proxy setting through dhcp?

I have a small LAN with 12 devices connected to it, ubuntu box running dnsmasq acting as a dhcp server and another ubuntu box acting as a web proxy. Is it possible to configure all of the devices in ...
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20 views

Setup server hosting hyper-v as a router

I have a windows 2012 server hosting several windows VMs by hyper-V. As I was building this infrastructure at home all VMs got IPs assigned from my home router (DHCP). So both hyper-v manager and VMs ...
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1answer
88 views

Using dnsmasq to service multiple subnets

I'm pretty new to using dnsmasq, and I would like to keep utilizing it in my lab environment. However, being new, I am unsure what commands/files to use. I've spent two days doing research and ...
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39 views

Assign a public ip to openvpn client

For learning purposes, I'm trying to set up openvpn server, so that each connected client would get a unique public ip address. I have a vps server and I ordered extra 8 static ips and they are ...
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1answer
28 views

Assigning different IP from range on dnsmasq DHCP server

I have an installed dnsmasq DHCP server. I want to assign different IP address from defined range. For instance my IP range is 10.11.12.10 - 10.11.12.50 but I want to assign different IP ...
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69 views

DHCP binding on Windows Server 2012 R2 won't stay checked

I've got a DHCP role running on a Windows Server 2012 R2 machine. The scope is set in the proper IPv4 subnet. When I select "Add/Remove Bindings..." I see both the NIC with the configured static IP ...
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14 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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22 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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63 views

Configure StrongSwan to work with DHCP

I have implemented a StrongSwan VPN server and would like to configure it to dynamically assign IPs to the end client. The VPN works if I give it an IP range however not if I set it to DHCP. This is ...
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2answers
54 views

Will computers connected to a switch have a different ip? [closed]

I want to set up a network switch with several servers connected to it that must be port forwarded. Please refer to the below diqgram for my setup: ___Computer 2 | ...
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1answer
56 views

When installing Windows Server 2012 R2 Essentials, should DHCP be turned off first on router? [closed]

Or should it be left on for setup, then DHCP on router turned off after setup so server does DHCP. Thank you.
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54 views

Windows DHCP Clients Randomly Revert To Old DNS Servers

In this one network I have, I am moving from a linux infrastructure to a Windows infrastructure. This has been a staged process. Originally there was no Windows infrastructure. DNS, NIS, and DHCP ...
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4answers
906 views

When the internet is down, so is Active Directory?

I am setting up a business server for a small office use with 5 users / 5 devices or so. Nothing elaborate here. I've set up a SINGLE Lenovo TS440 server (single NIC) with Windows Server 2012 R2 ...
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1answer
80 views

Getting “Connection timed out” on a tftp server though it seems everything is configured correctly, what could be the reason?

I've just installed a cobbler (with tftp/dhcp) server on a CentOS 6.6 machine at work. I've configured tftp to run under xinetd and the conf file looks like so: service tftp { disable ...
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1answer
16 views

Is it possible for networks to be assigned the same external ip [closed]

Is it possible for networks to be assigned the same external ip, not necessarily simultaneously, for example being assigned another users old external ip address? I am a programming student but my ...
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1answer
71 views

Auto DHCP IP Phones to a different subnet

I'm standing up a 3CX PBX system in my office and would like to set my DHCP to assign IP phones a 10.10.8.x address, while giving everything else a 10.10.0.x address (our current net). What would be ...
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0answers
38 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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105 views

VLAN ID over DHCP for Management Interface of Fortinet FortiAP

When configuring the FortiAP device it's desirable to configure the VLAN ID for the tagged management network. Accordingly to the manual it's possible to do so by "telnetting" to the FortiAP device ...
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2answers
52 views

Is there any lower bound on DHCP lease time?

Currently I am facing an issue to change the value of the DHCP lease time option in the server and configuring the the client with the same value. I have used dhcp-server package and have put the ...
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1answer
41 views

Certain PC's on vlan using link local 169.254.x even though communication present to DHCP Server?

I would really appreciate thoughts and opinions on this strange issue experienced recently. Consistent behaviour noted from problem clients: Up to a certain time in the morning user PC's were ...
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1answer
60 views

Cascade 2 routers with dhcp [closed]

I'm wanting to cascade 2 routers, one is a Linksys E3000 Router, the other is a wireless Cable Modem/Router made by Arris. As of now their cascaded via WAN to LAN, in other words, the internet port ...
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55 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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1answer
39 views

Polycom phone not requesting DHCP offer

My Polycom IP550 phone is not requesting the DHCP address that my windows 2012 server offered it. I have done a wireshark capture on a mirrored port on our switch and you can see that the phone is ...