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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One server has multiple IP address leases but just one adapter and no dhcp reservations?

One of our servers' has multiple (10) DHCP Addressleases and I don't know why. The server itself has only one adapter and even if I execute ipconfig /all I only see one IP address defined. Even in the ...
2
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1answer
2k views

How to find out IP address held by a Windows DHCP client yesterday?

We have a Windows Server 2008 with DHCP server running. I can see the current leases and reservations, is there a way to see the status of yesterday (or at least what IP a particular client had ...
1
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1answer
1k views

How can I configure my DHCP server to distribute IP routes?

I have a DHCP server (Linux, IPCop, dnsmasq) running on my default gateway server 192.168.0.1. I have a VPN endpoint on another server in the network (192.168.0.4). Is it possible to configure the ...
0
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1answer
92 views

Disable to receive address from dhcpd for one host/mac [duplicate]

I have a client in my network, who ask me to prevent him from getting ip address via dhcp. He has a strange software, and can't switch off dhcp-client, but this dhcp client do something bad after it ...
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1answer
268 views

Distance between DHCP server and remote pc effect performance? [closed]

Hey guys im doing a project where i have to create a WAN network however i was curious whether the distance of the DHCP server will bring down the performance loads if it was held from a different ...
1
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0answers
612 views

How to create a link between GNS3 and a VMWare Workstation VM that is totally isolated from the physical host?

My physical host machine runs windows server 2012 R2 with a DHCP server. I have the following topology in GNS3: Windows Server is the physical machine, it is connected to both VMNet 2 and VMNet 3 ...
1
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2answers
409 views

Microsoft DHCP server and Unix BIND dynamic DNS

Is there any way to make Microsoft DHCP server to securely dynamically update A and PTR records in Unix Bind DNS zone? Microsoft supports secure update using username/password authentication. Bind9 ...
8
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5answers
14k views

Reverse DNS records not registered when using DHCP

I've stumbled upon a strange behaviour with Windows machines, which seems to be fairly consistent between all Windows versions from Vista/2008 to 8.1/2012 R2; it doesn't happen instead when using ...
3
votes
2answers
7k views

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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votes
2answers
209 views

How to force the network machines to get the ip from a DHCP server? [closed]

How can I force all the network machines to get the IP from the DHCP server and prevent them from manually editing the network configuration. There are both Linux and Windows machines. The DHCP server ...
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2answers
1k views

How to make sure clients use only the IP assigned via DHCP

We want to limit the users Internet usage on a daily traffic basis but not the local network bandwidth. Our users are on different platforms (Windows, Android, IOS), therefore it is not possible to ...
1
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1answer
272 views

Computer can't resolve other computer names

I have a network with DHCP/DNS/AD setup with Windows 2012 server. Users cannot resolve computer names on the network without entering their FQDN, i.e. "server", but "server.domain.com" does. The only ...
1
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0answers
131 views

OS X bootp acts differently for different clients

I'm working on an OS X NetInstall environment, and having trouble with the BSDP portion. I have some hosts on the same subnet (build) as the server, and other hosts on a different subnet (try). ...
10
votes
1answer
6k views

Is there a downside to always updating DNS from DHCP?

I've got a Windows 2012 Domain Controller running DNS and DHCP servers. The default setting appears to be Dynamically update DNS A and PTR records only if requested by the DHCP clients. (This is ...
0
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1answer
555 views

iptables on Linux router does not forward DHCP between two LANs

I have an internal network as follows: A Linux system that serves as router, using iptables, with two network cards A client machine A DHCP Server The Router's eth1 is on the same LAN as the ...
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votes
1answer
109 views

Possible to auto assign static IP after first DHCP? [closed]

I'm building networks with 256 devices that can't be pre configured (they all must start from the same configuration, it's not possible to give them static ip beforehand). Is there anyway from a ...
0
votes
1answer
68 views

Network Route Test for DHCP

Is it possible to get a remote client to send a DHCP-style request to a server (which you're on) to test the network routes are open? I can check from server to client, but different ports are used on ...
-1
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1answer
658 views

Network Clients receiving DHCP responses from wrong subnet

This is my first time posting and I have searched for similar question to the best of my abilities yet believe none to be helpful for my cause. My problem is, that I have a Fritz.Box 3270 as router, ...
0
votes
2answers
2k views

Using Router with DHCP and NAT and Windows Server 2012 as DNS

I have a network currently set up as per the image below. We use Regus's shared Internet and I've create a sub network for our office by using DHCP and NAT on the airport extreme router. Now the ...
1
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0answers
275 views

Sonicwall L2TP Server is using a “phantom” internal DHCP server

Following a few articles on options 121 and 249, I'd like to push out routes to the L2TP VPN clients using the internal DHCP server on the Sonicwall. However, the Sonicwall seems to be using a ...
0
votes
1answer
243 views

Data only seems to go one way on ethernet over usb connection [closed]

I have a router+modem combo connected via ethernet to a raspberry pi (this part works fine) The pi has a usb wifi device plugged in, and runs hostapd, does NAT and provides internet to a household. ...
5
votes
2answers
1k views

How to correctly configure DNS usage in Ubuntu? Authoritative answers without RA flag are ignored

I have latest clean Ubuntu 14.04.1 64-bit from official website installed in Virtualbox. I connect to a VPN network using vpnc that sets 2 DNS servers using DHCP: user@virtual:~$ cat /etc/resolv.conf ...
14
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2answers
17k views

What are the possible issues in using very short DHCP lease time (< 1min)?

We have a network setup for a demo, which lasts about 15mn. Our DHCP server is configured to assign ~ 100 addresses (max number of simultaneous connections or our AP) ... but since people might come ...
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votes
2answers
303 views

Windows domain + Linux Domain on One Network

Currently our network is all tied to Active Directory with both Windows and Linux workstations/servers. We would like to implement a Free IPA server that synchronizes authentication between a Linux ...
4
votes
2answers
303 views

How can i locate rogue DHCP servers? [duplicate]

I am investigating some odd behaviour on a sub-net, where host registration doesn’t list some of the IPs that some users report having. Now that I’ve seen evince, i want to passively scan for the ...
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2answers
142 views

How can NIC's remember the DHCP address past power off? [closed]

I have now seen an HP ProLiant DL385 G7 (573088-421) and HP ProLiant DL360p Gen8 both being able to remember the DHCP address for its NIC's even though I had powered off the server, and pulled the ...
1
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0answers
149 views

Access Denied DHCP Tool

I cannot figure out why this is happening, when opening the DHCP tool on my server, I get the following message. Access Is Denied You do not have access to this DHCP server. To view information ...
0
votes
1answer
934 views

Foreman errors out when provisioning using an ms-dhcp/dns smart proxy

Im running foreman, with smart-proxy on a win2k12 r2 box running ad/dhcp/dns. When i try to provision smart proxy dumps this to the logs: Changed the current scope context to 192.168.20.0 scope. ...
6
votes
3answers
21k views

KVM/libvirt: How to configure static guest IP addresses on the virtualisation host

What I'd like to do is to set the guests' network configuration (IP address, subnet, gateway, broadcast address) from the host system. The used network setup is in bridge mode. How can I configure the ...
0
votes
1answer
603 views

Can't Access Network Drives through VPN

My issue is that when I'm outside the office I can't access any of my network drives. I can't UNC to them, through the FQDN or IP address. For example, domain.local\folder, or 172.26.6.2\d$. ...
0
votes
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
739 views

DHCP Option 66 ignored?

Im trying to setup a PXE boot server to deploy CloneZilla images easily, using pxelinux.0. I have a tftp-hpa server running on a server, I tested it with a client and it works fine. We are using a ...
0
votes
3answers
380 views

Split a Scope Linux<=>Windows

Is it possible to create a DHCP Failover Cluster between a Linux(Ubuntu) based server and a Windows Server 2012R2 based server. My idea was to include a new data into the dhcp.conf data to exclude a ...
2
votes
1answer
2k views

isc-dhcp leases file never cleaned

When running isc-dhcp the leases file seems to grow indefinitely (several hundred MB). If I restart the isc-dhcp service, the file shrinks to 1.5MB. How can I have isc-dhcp flush expired records ...
4
votes
2answers
17k views

Force Windows DHCP to Update DNS for All Current Leases

Is there are way to force Windows 2008R2 DHCP Server to update all DNS entries for all current leases? (Guess the server-side equivalent of ipconfig /registerdns) We had a configuration issue with ...
0
votes
1answer
47 views

Subnetting new address cannot connect to internet

I re subnetted our network from 10.1.24.1-254 subnet 255.255.255.0 To 10.1.24.1-10.1.25.254 subnet 255.255.254.0 I've changed all the devices subnets. The computers come online and get dhcp. They ...
0
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1answer
207 views

Windows Network Sharing - DHCP and Gateway pass through

I have several Windows 8 machines that are setup to do connection sharing over a wifi connection with switches behind a gigabit NIC. The devices behind the machines are Cisco phones and they are ...
2
votes
1answer
154 views

Preventing IP Phones from eating up DHCP addresses

We just installed a new IP phone system. The phones get their configuration via DHCP, which includes an option to set the phone to a different VLAN. The phone then requests an address via DHCP on that ...
0
votes
2answers
706 views

DHCP server - No IP for computers out of the domain

I would like to know if there is a way to deny leasing an IP address through my MS DHCP server to computers which are not registered in my domain. Thanks!
0
votes
2answers
13k views

Cannot ping a VM from a Hyper-V host

I am facing a weird situation in my network environment. My infrastructure looks like this: I have a D-LINK DIR-635 acting as my default gateway (192.168.0.1) A physical Windows 2012 Server ...
0
votes
1answer
140 views

Linux static dhcp ip for visitor access internet without requesting MAC address? [closed]

Currently, my company internet access for visitor are required to request MAC address from them if they want to access to internet. Can we do something like the Hotel wifi? they just access to the ...
1
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1answer
96 views

Failover DHCP Windows 2012

Is Windows 2012 failover DHCP (hot standby) compatible with Windows 2003? I'm not sure if it's enough to create a Windows 2012 DHCP server and configure failover options.
1
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1answer
72 views

Configure DHCP role on windows server without starting it

we want to migrate our dhcp service from a linux server to a windows 2008 r2 server. We have a huge list of mac-ip static leases. Is it possible to install a dhcp role on the windows server and ...
2
votes
1answer
159 views

Two LAN cables when using Remote Access Card?

I recently bought a HP MicroServer N54L and a HP Remote Access Card. Connecting to the server over a KVM viewer for BIOS setup etc. works fine, but when it comes to installing Ubuntu 14.04. the ...
0
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4answers
1k views

Who has the highest priority DHCP or static IP?

I have a printer at work, for some reason the router refuses to assign a specific IP for that printer via DHCP reservation and I had to configure it with a static IP. Sometimes the printer is off. I ...
2
votes
1answer
485 views

Cleanup DHCPD leases as well as DDNS Entries

I have a fairly simple set up on a Debian server I'm running. I currently have isc-dhcp-server installed along with bind9. I set up my zone and my reverse lookup zones and set up dynamic updates, it's ...
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votes
1answer
123 views

Get dhcp ip from a specific server [closed]

In a network that comes with two dhcp servers, how can I get network configured from one server instead of the other? Let's say there are 2 dhcp servers named A and B. My computer always get network ...
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votes
1answer
126 views

Edit dhcpd.conf through the WEB page [closed]

Good afternoon. Please suggest an elegant way to solve the following question: There is a server on Linux (CentOS 6.5 x86) with dhcp/nfs/http/tftp, which is used to load the images on specialized ...
1
vote
1answer
2k views

DHCP Trouble; getting APIPA addresses

I am having trouble with the DHCP Client. I am using a Netgear fvs336gv2 firewall. I recently upgraded to the new firmware and did a factory default reset and reconfigured all the vpn tunnels and LAN. ...
8
votes
2answers
3k views

Domain Controller offline for a few days

My primary domain controller died over the weekend, its motherboard is being replaced tomorrow. I have been told that the mac address of the server may change once the new motherboard is installed. ...