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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Server 2012: How could I create a DHCP scope just for my RRAS PPTP VPN clients?

I am using Windows Server 2012, and the server in question is both the PPTP server and the primary DHCP server. My current setup has a DHCP scope for this location, and anyone remoting in is assigned ...
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1answer
132 views

Install DHCP failover on domain controllers vs member servers?

What is the recommendation for installing DHCP failover; domain controllers or member servers? I can't seem to find any recommendations either way. I did find an old question here pertaining to ...
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2answers
65 views

Create smaller subnets from large subnet

My network is 10.10.0.0/16. I would like to break this up into /24s. My environment: I use /etc/hosts with dnsmasq for DNS and isc-dhcp-server for DHCP on an Ubuntu 14.04 server (gateway, router) ...
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1answer
63 views

DHCP Server Port-Based Address Allocation on Cisco switch 2960-x

I am trying to configure DHCP Server on a Cisco 2960-X switch to achieve port-based address allocation. I would like the IP address assigned to any device connected to that port to be the same every ...
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1answer
52 views

How to force DHCP server to provide a new IP? [closed]

I am using DHCP option 50 (client is an embedded device running eCos RTOS) to request a specific IP from the DHCP server (DHCP server is a built-in one with Windows 2003 server). First DHCP client ...
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0answers
40 views

dnsmasq dhcp-range for different access points

Is there a way to configure dnsmasq to hand out IPs from different range to different wireless access points? I have a basic Asus router configured as access point (it does no routing and doesn't run ...
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0answers
79 views

Cannot renew DHCPV6 lease in SLES12

I need to renew the lease of a certain SLES12 box. The machine is configured to use IPv6 only and so far I have tried the following: From here: dhclient6 -r -v eth0 && rm /var/lib/dhcp6/...
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65 views

Did I cause this DHCP failure?

I asked this here, it was requested that I move it to this forum instead. I have a question that I need some counsel on concerning DHCP and what may happen in a certain situation. I have a case ...
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1answer
25 views

DHCPD configuration by interfaces

I have two interfaces on a machine running Ubuntu 14.04 LTS. Which has two different interfaces namely eth0 and eth1. I need to give IP addresses to the clients by the interfaces. For example, Any ...
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1answer
20 views

How to interpret certain aspects of dhcpd logs

I have a DHCP server running on RHEL 6.6. I understand the process (somewhat) involving how the conversation goes from a protocol standpoint to set up a lease. 1 - The DHCPDISCOVER message. 2- The ...
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2answers
69 views

Changing DHCP server on Network ramifications?

On our small business network, we've unfortunately got our Cisco RV220 router acting as the DHCP server, but all of our client PCs and Servers are pointing at our Windows Domain Controller running on ...
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1answer
86 views

classes declaration inside of subnets in isc dhcp

I would like to use class declarations based on a subnet scope, is that allowed? Or are all classes global scope? here is my dhcp.conf snippet: subnet 10.200.147.0 netmask 255.255.255.224 { ...
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6answers
472 views

Wisdom of switching from Windows to redundant linux boxes for DHCP servers? [closed]

We've had a few issues with our Windows DHCP server failing. I'm a linux guy by nature, but not a systems guy (I'm a programmer who happens to be running IT for ~800 users), but I'm curious: how crazy ...
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0answers
29 views

ip dhcp excluded-address command no work

I want to provide 1.1.1.101 to 1.1.1.126 using dhcp pool. Here is my configuration no ip dhcp use vrf connected ip dhcp excluded-address 1.1.1.1 1.1.1.100 ip dhcp excluded-address 1.1.1.127 1.1.1.254 ...
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2answers
967 views

Hyper-V 2016 Gen2 VM PXE DHCP Timeout (Wireshark DHCP Discover -> Offer -> ???)

I've built a test lab running Windows Server 2016 and SCCM 2016 and I'm having an issue with PXE booting a VM to install an OS via SCCM. Here's the run down on the configuration. At this stage SCCM ...
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1answer
103 views

How do I manually release a DHCP lease on the DHCP server itself?

I have been doing some vm testing. I have created and destroyed a large number of vms on my subnet to test fresh provisioning via puppet. However, it looks like Ubuntu doesn't free a dhcp lease when ...
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139 views

Why do our Windows 2012 R2 DHCP Servers lose reservations?

Windows takes our DHCP reservations, but does not know how to hold-on to the reservations. There is a history of this in Windows 2008 DHCP server, but the closest i could find for Windows 2012 R2 ...
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2answers
134 views

Dual stack linux router, can't forward IPv6 prefix

I have a small offic here with a few workstations and I would like to implement a small server for stuff like a proxy server, samba etc. This is the topology of said network: +-----+ dynamic +---...
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24 views

Ubiquity AP keeps people from connecting sometimes. Happens with a couple other AP's as well

I believe this is ok for server fault, forgive me if not. We have had numerous very cheap AP's and I am trying to purchase a mid tier product now. We had EnGenius ENS 202EXT and a couple home office ...
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1answer
38 views

Is there a benefit to assigning a static IP to an instance instead of DHCP

We are creating a Windows AD instance in our AWS VPC and we're wondering if there is any benefit to assigning a static IP to that instance instead of using the default behavior of a subnet which is to ...
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1answer
71 views

Create DHCP for 1000 Users

Currently we are running windows server 2003 with static ip for 200 users ,now the organiszation is about to expand so atleast 1000 people will be working, so i needed to create a DHCP for 1000 users. ...
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0answers
64 views

DHCP Discovery being Ignored

I'm having some real issues with a DHCP server I've setup. I'm at my wit's end, having found no answer anywhere to this problem of mine. Here's the setup: I have a CentOS server machine, running ISC'...
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1answer
32 views

Priority of dhcp servers

Let say there is a main Server which is assigning ips by dhcp to 50 different LAN ports in network.Now if at some LAN port we connect a small router on the yellow port(so that all other devices come ...
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2answers
111 views

Window Server 2012 with external DHCP

I have a Cisco router connected to a server with Windows Server 2012 fresh installed on it. What should I do to configure DNS if I leave the DHCP of the Cisco router active?
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1answer
22 views

set host-name failed on Ubuntu vivid

With Ubuntu vivid, I cannot bind the hostname of my server with the IP address gotten by a DHCP server I tried to add in dhclient.conf (and reboot) set host-name "myserver"; But, still doesn't ...
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1answer
25 views

Network is DHCP - Can I manually set an IP to a device?

So as of right now, our SonicWall controls DHCP leasing. We have a bunch of network objects that really need to remain static (I plan on converting the network to static later), but I need a fix in ...
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1answer
72 views

DHCP Server with 2 nics

I have windows 2008 r2 x64 enterprise server with a domain. That server has 2 NIC nic1 which is connected to a router nic2 - here i need 1) run dhcp for private LAN 2) forward internet connection ...
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1answer
32 views

DHCP Server Offers, But Client Doesn't Accept

I currently have a development node that runs KVM virtualized VMs. There is a DHCP server running on the node to provide addresses to the VMs. I had DHCP working previously, but I reinstalled one of ...
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1answer
101 views

CentOS DHCP server gives DHCPNAK upon DHCPREQUEST from client

I'm trying to setup a DHCP server on a virtualized host only network and I'm having some issues. Currently I'm only running two VMs one being the server and the other being the client both VMs are ...
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2answers
40 views

Is it possible to use Win XP as a DHCP server in a network? [closed]

Is it possible to use Win XP as a DHCP server in a network ? Does Win XP can give automatic IP addresses to clients in a network ??
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2answers
87 views

Expanded DHCP scope, new reverse lookup zone isn't populating

I'm running a Windows Server 2008 R2 domain. We outgrew our /24 DHCP scope, and I ended up needing to expand it. This was done by exporting the old scope, changing the txt config, deleting the ...
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1answer
52 views

Using Clonezill/DRBL DHCP as main DHCP server

Right now in my department we are running a DHCP server on some older hardware that is looking like it might fail soon(ish) and is also running CentOS 4. We'd like to upgrade to a new DHCP server but ...
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64 views

DHCP failover/DNS not working when primary server is offline

In a VMware environment we deploy daily many new virtual hosts and for this we need a failover DHCP/DNS. Based of CentOS 7 I setup two virtual hosts as failover DHCP and dynamic DNS (dns01/dns02). I ...
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2answers
62 views

How to secure network against connecting bad device with DHCP?

I have a network with 500+ computers, at my area there is lots of cooperation companies that sometimes bring their own routers. If they do it in sneaky way and do not turn off DHCP service on the ...
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1answer
267 views

What are the practical risks of enabling the unsecure DNS updates on Windows?

What are the practical risks of enabling the unsecure DNS updates on Windows? As far as I found enabling the unsecure DNS updates is a requirement for enabling DHCP Linux clients from registering ...
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4answers
783 views

What happens if the DHCP server comes online after the client devices do?

If I have a Windows PC running a DHCP server. I expect it will take on order of minutes a few to boot. My network will have a variety of other devices from various vendors that will boot within ...
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23 views

Could dhclient be causing haproxy to stop listening?

I've noticed every 7 days HAProxy stops responding to requests correctly - it automatically makes firefox download a blank file in place of the website. Upon inspecting the server - everything seems ...
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30 views

Wireless clients loosing network access randomly

We have the following setup at the office: Windows Server 2012 DHCP Unifi AP (one of these rounded beauties) set up to use WPA2 with AES Zyxel ZyWALL 110 as firewall Some of the clients (laptops) ...
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23 views

Weird behavior with multiple pool inside shared networks on isc-dhcp-server

I have a weird behavior on my dhcp-server, I am using a load balance configuration and using multiple pool inside that shared-network, I have this configuration: shared-network "my-shared-network" { ...
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1answer
27 views

Determine when changed from static to dhcp?

We have a machine running Windows Server 2012 that is using DHCP for ip assignment, in an Active Directory network. It is standard protocol for us to use static ip and no one recalls changing this ...
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93 views

Using dhclient or dhcpcd to assign address for alias interface

I have a Linux machine with one Ethernet interface eth0 which already has one primary static address and one secondary static address (eth0:1) assigned. I would like to use DHCP to dynamically assign ...
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3answers
1k views

Debian 8 resolv.conf overwritten by IPv6 autoconfiguration/DHCP when DHCP disabled

I have recently installed Debian 8 on a network with IPv6 DHCP Enabled. /etc/resolv.conf is being overwritten by the IPv6 DHCP entires continually despite the fact that all IPv6 DHCP is disabled, ...
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1answer
68 views

Why is the DHCP lease start time greater than the end time

On our DHCP server I see this quite a bit on some of our leases and I am not sure why its being reported like this. lease <IP Address> { starts 5 2015/08/21 13:22:20; ends 5 2015/08/21 13:22:...
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1answer
194 views

dd-wrt DHCP forwarder is not working

all. I have a network which a Windows server is running RRAS(192.168.6.1) and another Windows server is running DC,DNS,DHCP server (192.168.6.2). I added a dd-wrt flashed router. The client connects ...
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72 views

ISC DHCPv6 reservation

I've set up ISC DHCPv6 server on a CentOS 7. Here is the /etc/dhcp/dhcpd6.conf: authoritative; option dhcp6.domain-search "example.com"; default-lease-time 3600; max-lease-time 7200; log-facility ...
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30 views

DHCP based Server not updating A record

We have Citrix Servers which get IP from DHCP. After scheduled reboots, some Citrix servers are not pingable via hostname. nslookup is not able to resolve the hostname. OS: Windows 2008 R2 Citrix ...
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33 views

How to reach a private IP (DHCP enabled) from a public facing IP through NAT?

Lets say we have computers C1 and C2 C2 has two network interfaces C2.eth0(public facing) and C2.eth1 local second physical network (addr:10.10.70.101 and Nw:10.10.70.0) Now, there are multiple ...
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1answer
111 views

Adding 4th scope to DHCP and make a superscope in windows 2012

Hope someone can shed some light here. I have a little network drama which I'm trying to get resolve as soon as possible. To give you a little background; We have CISCO SG300 small business switches ...
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14 views

Setting up developer instance dns

We have a bunch of developers that are coding webbased solutions. They want to share the solutions on their local machines with projectmanagers and QA's etc. to let them access, test and demo the ...
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1answer
483 views

Multihomed windows server 2012 r2 connectivity fails

I have a Windows Server 2012 r2 with 2 NICs. 1 local(169.254.1.1/24) and 1 "public"(conected to another local network, 10.0.10.47) interfaces. I have configured DNS, DHCP ONLY on the local interface, ...