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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Scope reconfiguration - decreasing subnet mask and ip range

i've been asked to change my subnet mask on our network from a 255.255.0.0 to a 255.255.255.0 (we are using DHCP and are using windowsServer 2012). - this should not be an issue for the number of ...
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2answers
150 views

How can I automate the DNS flush?

I am having couple of Virtual machines . Few applications are using the HOSTNAME in their configuration files to contact these machines. Everything was running fine and all happy! until application ...
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1answer
10 views

Enforce a client hardware address via DHCPv4

Is there a DHCPv4 option that allows a client to tell the server never or at least for some time to deny any other client hardware address than its own? I'm looking for a way to deny any other host ...
3
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1answer
52 views

Can I prevent Debian from hitting DHCP server twice during installation?

I have a DHCP server used to do unattended installations of Debian: boot from PXE, and then install the operating system with a preseed. The DHCP server (Debian's isc-dhcp-server package) is ...
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1answer
28 views

I cannot determine hostname of remote machine, but my local DHCP server can [on hold]

I have 3 devices in my network - my PC and 2 self-made devices. My PC serves as DHCP server for devices. All this is connected via ethernet and switch. DHCP server shows valid hostnames of devices: ...
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17 views

Can Windows request multiple addresses with different client identifiers?

Is it possible for Windows to request multiple IP addresses for the same interface by making requests with different client identifiers? (Similar to the 'pseudo interface' functionality in Linux's ...
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2 views

How to send DHCP server a different hostname than the machine's static host name? [migrated]

I'm using an at-home-type wireless router as the DHCP server for my desktop, with said router's management console showing the host names of the connected machines. If I put send host-name "AAA"; ...
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12 views

How to get unbound to forward DDNS updates?

We use bind on CentOS as our primary name server but also recently (again) started using unbound in front of it (on port 53) so that domains can be (partially) overridden transparently. The only ...
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66 views

How can I identify a rogue IPv6 DHCP server on my LAN?

This will be kind of a long post, but I want to give complete information. I have a home/business LAN with isc-dhcp-server running an ipv4 dhcp server and bind as a DNS server running on an ubuntu ...
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1answer
31 views

Router can connect to internet but clients intermittently can't get beyond the router [closed]

Currently working with a small business which is using an ISP supplied domestic ADSL modem/router to connect their internal setup to the internet and this is also being used for DHCP. They're having ...
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1answer
23 views

powershell: Remove-DhcpServerv4Lease does not remove existing leases

I want to delete all DHCP leases and reservation from server WSKELLER. From the documentation I seem to understand that this would be accomplished with: Get-DhcpServerv4Scope -ComputerName WSKELLER | ...
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26 views

powershell: delete all DHCP reservations/DNS entries in a scope/forward/reverse lookup zone

I have made a little powershell script that takes a fixed-width text file and populates a DHCP scope, a DNS forward lookup zone, and a DNS reverse lookup zone. My next step shall be to have the script ...
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0answers
7 views

I have one NIC with two conflicting IPs. Fix? [migrated]

I searched for my problem, and although there are similar questions none guided me in the correct direction. Sorry if it looks like a duplicate question. I have a LAN behind my ISP modem, routed by a ...
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0answers
13 views

Sending custom DHCP option to server with dhcpcd

I've been trying for several days to configure dhcpcd to send a non-standard option to a DHCP server without any success. On the other hand dhclient works fine. I need to send an option with code 90 ...
2
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1answer
83 views

dhcp server gives “no free leases” error although there should be available IPs

We have a small HPC cluster of about 40 machines running Rocks Linux Distro 6.2 (based on Centos 6.6). I have been trying to add 6 more machines to the system in the last few days. The first 3 were ...
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1answer
25 views

force dnsmasq to bind an interface for DHCP

I want to use dnsmasq with two configs on two interfaces, which should be bound locally. If you read the manpage, it looks like interface=wlan0 bind-interfaces should do the trick. But it always binds ...
2
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0answers
19 views

DHCP Server not responding to relayed DHCP DISCOVER

I'm currently segmenting our network in various subnets. We already have a DHCP server as a part of our Active Directory (Server 2012). I want to use this server for all subnets so I need to work with ...
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2answers
59 views

VM acting as DHCP/PXE server in virtual network?

I'm working on a proof of concept for running Stacki, a DHCP/PXE server which serves out Kickstart PXE boot configurations to VMs within a given subnet. What I'd like to do is setup at least two ...
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0answers
29 views

Cisco 6500 - spike of DHCP_SNOOPING-4-QUEUE_FULL causing clients to lose connectivity

Today we had an incident that started with people complaining they couldn't connect to our wifi after coming back from lunch. Long story short, clients were no longer able to get IP addresses from ...
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1answer
19 views

how to enable incoming connection from outside your home network, without a router?

I have a simple question. I dont have a router. i connect to the internet through a usb dongle or through hotspot from my android phone. The usb dongle connects to a 4g network, i use a prepaid sim ...
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0answers
30 views

dhcpcd: static IP without cable attached

I'm trying to setup a Raspberry Pi 3 (debian jessie) using static ip. It will also be running a dhcp server. It will not be connected to a network. From time to time it will be connected to another ...
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17 views

Linux - bind DNS+DHCP@LAN - dynamic update not working

This is my first attempt to make bind dns and dhcp server on Linux, and I have some issue. Have this: one DHCP/DNS server (hostname:services) 192.168.3.10 few hosts (host1, host2, ...) few vlans (...
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0answers
25 views

How to setup DHCP Relay in Debian 8?

I have three VMs. One VM is a DNS and DHCP server, one is a Linux router running Debian 8 and the last VM is a test machine. I am trying to configure the Debian 8 machine as a DHCP relay. I have ...
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44 views

DHCP server assigning same IP address even if Computer is connected in different VLAN

DHCP Server OS - Windows Server Standard 2008 R2 DHCP Client OS - Windows 7, Linux based OS etc.. I have configured DHCP Server on Windows Server Standard 2008 R2 with SuperScope. Let assume that i ...
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1answer
20 views

Set an network interface in FreeBSD as DHCP-enabled, but totally silent until explicitly enabled

I'm setting up a FreeBSD carp router/firewall backup, my provider is giving out IP by DHCP, it's static and tied to MAC address of my NIC, so when carp switches state I'm trying to switch off the ...
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1answer
84 views

Block DHCP server from other network

I have problem on PC's (Windows 7) with two network interfaces, sometimes nic that is supposed to be in network 10.1.19.0 has address from 192.168.0.0 My networks: 192.168.0.0/24 with DHCP running on ...
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1answer
31 views

DNS Server list not updating after DNS migration

Toady I'm migrating a DNS/DHCP server from Server 2008 on Xen to Server 2012 R2 on VMware. Things went ok for the most part. DHCP is working just fine and has been tested. I manually set one test ...
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1answer
60 views

DHCP server not found during PXE boot

I'm trying to run a PXE server and encountering the “PXE-E51: No DHCP or proxyDHCP offers were received” error, which usually means that: the PXE client did not receive a reply to its DHCPDISCOVER ...
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0answers
40 views

static network setup still using DHCP

I'm configuring an Ubuntu 14.04LTS server on our internal network. Everything works and runs as expected. Its assigned a static IP, here's /etc/network/interfaces # The loopback network interface ...
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1answer
40 views

Two subnets, two DHCP servers. How to stop both DHCP servers from responding to requests from both networks?

I have an environment with two subnets 192.168.1.x/24 and 192.168.2.x/24 Each subnet/network has a Cisco RV082 router as the gateway and a domain controller in each environment that also has a DHCP ...
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17 views

De-authenticating Wi-Fi without turning off the device

I have established Wi-Fi access point using hostapd and the IP address is configured via DHCP. This is my configuration file hostpad.conf interface=wlan0 driver=nl80211 ssid=User hw_mode=g channel=...
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1answer
72 views

Windows Server 2012 DHCP not working sometimes

Currently on my network I have Windows Server 2012 setup with DNS, DHCP, and Squid Proxy. Most of the time when my clients connect to the network the DHCP server won't hand them an IP address, leaving ...
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44 views

Get an IP from DHCP behind a few routers

I know that there few posts for this subject (i read them all) but they don't cover my case I'm new in the company and having some beginners problems... The context: Users LAN - SW Access - SW ...
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1answer
51 views

DHCP option domain name server

I am new to networking. I got struck while having a look at the dhcp configuration file. I just tried to make a WiFi connection for data transmission using this link. I am using linux OS. I have ...
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1answer
148 views

Dynamic IP address to Domain

A camera when connected to a DHCP Network receives an IP address. Using IP lookup I find the IP address of the camera. Then I type the camera IP address in a browser - it shows a website (index.html) ...
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1answer
655 views

Why does a DHCP-provided DNS IP address becomes a static one in Windows 10?

I have a Windows 10 machine which often changes networks and retrieves its IP configuration via DHCP. Since an indefinite moment in the past it started to set its DNS as fixed, despite the fact that ...
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1answer
84 views

dhcpd class match on hostname or mac address

We are running DHCPD 4.1.1-P1 on a RHEL 6 server. Currently we have 1 class defined for deny purposes. We now have a need for a class match to allow all devices that match a variable and deny ...
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1answer
71 views

libvirt: set hostname using dhcp in virtual network

I've configured a host-only (aka private) network for a group of VMs on a CentOS 7 host. I've created static leases in the DHCP section for the virtual network. The IP address is getting set ...
0
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1answer
59 views

DHCP on Meraki MX64 or Windows Server 2012R2?

I'm new to the Cisco world and I would like some advises. Currently I'm configuring a Windows Server for a small bussiness (less then 50 users). Normally the Windows server would have the AD, DNS and ...
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1answer
46 views

Set Internet Access for VLAN + Default Gateway + DHCP Client

I have a question that make my mind so bussy. I would appreciate if anyone guide me about this. So let me explain: Firstly consider We have bellow devices: Devices: 2 L2 Managable Swiches 1 ...
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0answers
54 views

How to configure isc-dhcpd-server to update reverse zone without client pre configuration?

I'm trying to set up isc-dhcpd-server from ubuntu 16.04 (4.3.3-5ubuntu12) to configuring heterogeneous network with ubuntu, windows, macos, other ip devices. I'm already setuped bind to store ip ...
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1answer
90 views

Why does a DHCP4 client not respond to the DHCP Offer from a DHCP server?

An extremely simple DHCP server works reliably with Windows 10 PCs and Android devices. It receives DHCP Discover from a client, replies with DHCP Offer, then receives DHCP Request from a client. ...
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29 views

Do DHCP server messages have to be sent from port 67?

I know DHCP servers receive messages (e.g. Discover, Request) at port 67. Can a DHCP server send responses (e.g. Offer, ACK) to port 68 from a port other than 67? I thought the client should not ...
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11 views

What data is stored in DHCID RR by rfc 4701 (in lay terms)?

To understand what is going on my dhcp server I need to understand what is stored in this record that idenities my dhcp clients. I have long read this standart. But cannot understand. In lay terms I ...
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1answer
46 views

Configuring DHCP for two separate subnets in same lan

I have 192.168.1.0/24 network right now. As number of users growing this is getting difficult to manage them. Hence I added one DHCP server in network with two scopes. One is for 192.168.1.0/24 & ...
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1answer
339 views

Wireless Client (Laptop) unable to connect to domain (windows server)

I have established a server in the office using Windows Server 2008 R2 and Active Directory. And then created several users in Active Directory Users and Computers. The PC users can successfully join ...
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1answer
33 views

Wireless devices are detecting DHCP/DNS but Wired are not

I set up a server hosting AD, DNS, and DHCP. My wireless devices are successfully contacting the server and receiving an IP address, but my wired devices are not connecting. I have 2 virtual servers ...
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0answers
26 views

Setting dnsmasq_config_file with Puppet managed OpenStack installation

Our OpenStack installation is rolled out with Puppet. We use the excellent puppetlabs-openstack module for that. Due to the slow turnover cycles we are still stuck with version 5.0.2, right now we ...
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0answers
45 views

Interface being deleted

I have a cluster consisting of CentOS6.5 and CentOS7 virtual machines. I've come across an issue where the network interface, eth0, is being deleted for reasons unknown and I'm looking for help on how ...
1
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1answer
147 views

How can I clear the DHCP GUI in OSX Server? Ghost clients in the building

I have a few client machines showing up in the network (not only in Server.app but also in various logs), which have "Computer Names" (Bonjour names in Apple-speak) which I don't recognize, but ...