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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ipv6 address assignment via local server from isp assigned block

I have been looking around and found the information confusing as best. Is there a way to have a server "recieve" the /64 ipv6 block from the isp and then use dhcp or something to assign it out to ...
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8 views

WDS and DHCP failover [on hold]

I have two server Windows 2012 R2, Server1 is for DHCP, Server2 is for WDS, everything was working fine. Then I installed DHCP on Server2 to work as a hot standby failover DHCP, I review WDS but it is ...
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1answer
44 views

adding more IP's to my DHCP scope

Our DHCP server is running out of addresses in its range. How can I increase the range? We have Windows Server 2008r2 as a DC\DNS\DHCP server. current scope range 10.220.120.1 - 10.220.120.254 ...
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6 views

Specific ip settings for different wifi access points [migrated]

I have a situation where I want to connect a tablet to two different networks, not simultaneously but switching from one to the other (and at different locations). The tablet is running on Windows ...
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0answers
18 views

DHCP Requests cannot get through Switch

First a little about the network setup: We are a smaller department of a larger school. We have 7 offices with TP-Link managed switches as well as 20 APs and 24 classrooms. The switches, APs and ...
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16 views

DD-WRT to push alternate Name Servers to clients over DHCP [migrated]

In order for WiFi DHCP clients to use directly 8.8.8.8 and 8.8.4.4 as name servers, DD-WRT has been configured as follow add dhcp-option=6,8.8.8.8,8.8.4.4 in /etc/dnsmasq.conf (reboot) since that ...
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1answer
50 views

qemu, kvm: Guest: No DHCPOFFERS received

I'm trying to set up a virtual machine (guest) wich should act as router (ubntu 14.04). The host is a CentOS 7 machine (4x LAN). The guest should get a public ip address over it's eth0 (guest), wich ...
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1answer
45 views

Are MAC ID passed via DHCP Relay

Do MAC ID pass through dhcp relay? Even if its connected on the WAN from the internet? So if the DHCP Server is on the WAN of the router and connected to a DHCP server on the internet is it passed?
2
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1answer
48 views

DHCP Relay behind two router

If i have a DHCP Server above two routers and a cleint computer below and the client computer is connected to a router with DHCP Relay, will dhcp pass through those two routers? Here is an example ...
2
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1answer
90 views

VMware ESXi: dynamic registration in DNS fails

I installed an ESXi server 5.5 in our test lab. Everything runs fine, the VMs I host on the server are able to do dhcp and get registered in the DNS. But I am unable to register the ESXi host itself. ...
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187 views

HP Procurve 2920 VLANs with DHCP cannot ping

I have problem setting up working VLANs and DHCP server on HP Procurve 2920. My problem is that I cannot even ping computers between VLANs with static ip addresees. winXP pc on VLAN101 with ...
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39 views

DHCP Server configuring

I've been configured DNS and DHCP on Windows Server 2012 correctly. But when I open the DHCP server from start menu and server manager, I get different result. When I run DHCP manager from server ...
2
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1answer
15 views

Prevent Windows Server 2012 from using DHCP-provided default gateway?

How can I prevent Windows Server 2012's local network connection from using the default gateway provided by a DHCP server? I do not control the DHCP server so the solution must be implemented on the ...
0
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1answer
51 views

Powershell where-object speed improvement

I want to get a list of my DHCP reservations from my DHCP Server running Windows Server 2012R2. The list should contain the IP, MAC, name, description and the lease status of the reservation (just to ...
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0answers
4 views

Network interface configuration on Debian 6 (No DHCPOFFERS received) [migrated]

I am trying to configure an interface to allow internet connection on a home server which runs Debian 6 x86. The server is behind a router which has DHCP enabled. The router IP is 192.168.1.1 with ...
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2answers
76 views

How to override the hostname that DHCP configures on a CentOS7 box in AWS? [duplicate]

The title nearly says it all. I have a VM in EC2 running CentOS 7. It uses DHCP, which seems to be a EC2 requirement. DHCP keeps overwriting the hostname on reboot, no matter what I try. I won't ...
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1answer
64 views

How does Bind IP to MAC work? [closed]

A client is connected to the network with a DHCP server, but also has a Bind IP to MAC entry in the router. What is the sequence of steps that determine the final client IP configuration given that ...
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55 views

Internet drops out randomly for short periods of time (LAN issue)

I run a network (I'm just a math teacher) at my school. We get random 10 or so minute periods (I'd guess three a day on average) where the Internet is not accessible from within the LAN. If I go to ...
2
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1answer
67 views

DHCP reservations for a range of MAC addresses

Question Our DHCP server is set up to only give IP addresses to machines that it knows about (all IPs excluded, reservations for each MAC address). Part of the address range is used for virtual ...
0
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1answer
28 views

How to get the maximum details from a remote host and forcefully get a particular IP?

I have setup a Ubuntu server(xxx.222.4.216) for our Redmine tool and recently we got a IP conflict in the machine and now im unable to get back the IP(xxx.222.4.216). I would like to know if there is ...
1
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1answer
115 views

How to configure PXE/Tftp in dhcp.conf on vmware Fusion 7 Pro with static reservations

G'day all you very friendly and never cranky server fault people. I'm senior devops engineer with a deployment system to ship a couple thousand linux machines a week. I'm using vmware fusion 7 pro to ...
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1answer
67 views

OpenWRT router as a switch with DNS

We have a router (8 ports) that serves our church (it also is our modem with ADSL2 etc) and handles our DHCP services. I've needed to extend our network to accomodate another 2 ports, so an extra ...
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2answers
150 views

Windows Server set multiple Gateways and metrics

I would like to configure my DHCP Server (Windows Server 2008 R2) so that it assigns to each host two gateways. The client should use the gateway which is closer (less number of hops). I can do this ...
10
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2answers
292 views

Windows DHCP server - distribute multiple default gateways?

I'm helping a client through the process of configuring a Windows 2012 DHCP server while migrating from Linux ISC DHCP. In the Windows New Scope Wizard dialog, there is an option to: ...specify ...
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43 views

Why need DHCP Relay (Watchguard) inside the Trusted network?

I run a small network that looks like this: { Win 2008 server , desktops , Wifi AP} -> Switch -> Watchguard XTM21 firewall (the Switch is connected to the XTM's Trusted interface ; the XTM ...
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1answer
36 views

Using AirPort DHCP relay agent info to assign IP by policy from server 2012

We have recently setup a Windows server 2012 DHCP server, with one scope of 10.0.0.0/16 We have a couple of policies in place to make sure certain ranges are assigned to certain devices, e.g. Thin ...
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57 views

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
287 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 ...
0
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1answer
59 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
33 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
59 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 ...
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110 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 ...
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2answers
68 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 ...
5
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2answers
791 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 ...
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2answers
632 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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2answers
55 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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16 views

Change network mask DHCP server

Currently i have a Ubuntu with isc-dhcp-server running with the following configuration authoritative; ddns-update-style interim; ignore client-updates; subnet 192.168.1.0 netmask 255.255.255.0 { ...
2
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2answers
158 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
65 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 ...
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0answers
45 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). ...
6
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1answer
363 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
120 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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1answer
44 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
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1answer
42 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 ...
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1answer
111 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
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2answers
211 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 ...
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88 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
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1answer
74 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
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2answers
376 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 ...
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29 views

How to identify hosts with bridged adapters

We have an issue with our Windows DHCP server randomly having bad address errors. The current top theory is that there is a host within that pool with bridged network adapters, causing all sorts of ...