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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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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3answers
3k views

Gateway gets stripped from DHCP Reply through OpenVPN tunnel

I have a bridged OpenVPN setup. This is my server config: port 1194 proto udp dev tap0 ca /etc/openvpn/easy-rsa/keys/ca.crt cert /etc/openvpn/easy-rsa/keys/server.crt key /etc/openvpn/...
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0answers
13 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
2k views

VLAN & WiFi & DHCP with Cisco SG200

I'm trying to configure a small business network with one Cisco SG200-26, a Linux server and two TP-Link TL-WA801ND. I have set up the APs to have two different SSIDs, Public and Staff, and have ...
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1answer
40 views

Opensource DNS/DHCP Solution [closed]

Can anyone recommend a free, opensource DNS/DHCP solution to manage around 200 machines (workstations and servers). We're a linux focused organisation and are trying to move away from MS as much as ...
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1answer
14 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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1answer
2k views

CentOS: DHCP Server and DHCP relay on same machine

eth0 IP: 192.168.1.100 Alias interface eth0:dhcp IP: 10.10.1.100 dhcpd.conf: authoritative; local-address 10.10.1.100; subnet 10.10.1.0 netmask 255.255.255.0 { range 10.10.1.10 10.10.1.50; ...
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1answer
2k views

two domains, one LAN, two DNS server, 3 problems

Background: we have 150 users using AD on domain ABC. Windows 2003. that serverDC1 has a DNS, DHCP roles, and there is serverDC2 which is its live DNS backup. logs seem healthy. then we chose to ...
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1answer
3k views

Retrieving kickstart and other .img file in pxe remote installation in CentOS

I am trying to installation CentOS through pxe tftp installation. Installation starts but it fails to download image files from the http server. but file are accessible on the http server. Logs from ...
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0answers
14 views

Windows Server DHCP not working over 2.4 GHz Network

I have just realized that my Windows Server that is handing out DHCP addresses is not working over my 2.4 GHz network. I have tested both the Wired and 5 GHz networks in our building, but over the 2.4 ...
3
votes
1answer
30 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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2answers
5k views

What is DHCP Rebinding?

My external network interface on a gentoo box will produce these errors intermittently (maybe 3-4 a week). It is hooked up to Optimum online, and gets its IP via DHCP. It's always-on, and it almost ...
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1answer
50 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
20 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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0answers
8 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
15 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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1answer
1k views

Dual-port server acting as router, but LAN can't see WAN

Using Windows Server 2012 Essentials. I've got two ethernet ports. One is connected to a router which is connected to the internet. This portion of the network is fine. The router runs DHCP on the ...
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4answers
26k views

How do I force Linux to reacquire a new IP address from the DHCP server?

The environment is Debian, although the answer will apply to all distributions.
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0answers
21 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 ...
0
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1answer
8 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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2answers
3k views

Juniper SSG5 DHCP IP Pool is full. Unable to offer IP address to client

hope we have some Juniper guys around, I have configured a Juniper SSG5 as our main firewall/router the DHCP server set on interface bgroup1 to have a rang from 10.10.10.76 to 10.10.10.210 All ...
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5answers
16k views

Register A records for my Linux box on my Windows 2008 DNS/DHCP server

I've a network which is mainly Windows: Windows 2008 server (with DNS/DHCP as well as AD), and various mainly Windows machines (servers, XP, 7). I know trying to add few Linux boxes, and can't make ...
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1answer
76 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
2k views

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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1answer
1k views

How can I block all traffic to/from an bridged interface while allowing DHCP?

I have a PC (running Fedora 20) that is being used as a "software switch" to control the network connectivity of some external devices. There are eight such devices; the PC has two 4-port Ethernet ...
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2answers
529 views

DHCP address leases to SQL Server database?

Is it possible to store the DHCP address leases in Windows 2003 to SQL Server database??
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1answer
37 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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35 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 ...
0
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1answer
28 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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0answers
14 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
56 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
1k views

How can a dhcp client in linux can send the dhcp option 60 - specifying the vendor-id?

I am using fedora core machine. My linux- fedora core machine - client wants to send the dhcp option 60 specifying the vendor id to the dhcp server. Next, I want to read the dhcp option 43 send by the ...
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1answer
38 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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5answers
19k views

In a Win7 computer that belongs to a domain, how do I append DNS search list entries?

My desktop is part of the company domain and receives its IP address and DNS search list via DHCP. That's fine, of course. Is there a way that I can append additional entries to the end of the DNS ...
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1answer
2k views

Windows 2012 DHCP Failover: Scope refuses failover config Error: 20044

I have a scope configured on a Windows 2012 DHCP server (primary in a hot standby config) with two Cisco Vendor class options. I've added the Vendor class options, identically, to the standby server. ...
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9answers
99k views

Any way to find unused IP addresses on my network?

How can I locate unused IP addresses on my network? The DHCP server keeps assigning the same address and I need a different IP address to test my application with. The software would need to run on ...
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0answers
72 views

Small office - shutting down server - moving DNS/DHCP to router

I am taking down a Windows 2003 Server which runs AD as well as manages DNS and DHCP for the office. There is one desktop and a handfull of laptops on the network. Router is a Netopia Firewall Router. ...
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1answer
144 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) ...
3
votes
1answer
627 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
113 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 ...
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0answers
53 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 ...
0
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1answer
66 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 ...
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1answer
33 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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1answer
41 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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4answers
30k views

Why is Server 2012 assigning “169.254.*.*” series when creating DHCP server?

I have a small office, with ATT Motorola modem (192.168.1.254) set as passthrough to Dlink DIR-815 (LAN 192.168.0.1) I am trying to setup DHCP server on Server 2012, and when I create new DHCP server, ...
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2answers
833 views

Configure OpenNebula to use DHCP

I'm trying to configure OpenNebula to use the DHCP server that already exists on my network. Yes, I already know that OpenNebula manages virtual mac addresses rather than IP addresses, but that doesn'...
4
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3answers
30k views

Domain connection shows as “unauthenticated”

I have seen various different questions for this problem floating around but either the circumstances arent the same or the solution doesnt work so thought i would post it to see if anybody has any ...
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1answer
74 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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42 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 ...