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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How to implement DHCP, DNS, hostnames on AWS VPC

This is what I THINK can happen and what I want. I create a VPC in Amazon, put a public subnet into it, put a puppet server instance and a full stack web server instance in the VPC. Now I set the ...
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10 views

Create IPv4 reservation with DUID in Windows Server 2012 DHCP

Can I configure reservations for IPv4 addresses in Windows Server 2012 DHCP for systems which send DHCP requests with a DUID for their client identifier (Option 61)? I have Linux (e.g., Fedora 21) ...
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19 views

Hyper V host not showing in dhcp server client table, but guest is

So I've got Hyper V running on windows 8.1. I configured an external virtual switch which uses my wifi physical card. So I get a virtual adapter that gets its ip from my dhcp server (e3000 router). ...
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1answer
14 views

Mac Host and VMware Fusion Bridged Networking Guest with Incorrect DHCP Client Identifier

System Info: I have four Apple Mac OS X Client host systems (running Yosemite, 10.10.2) bound to an Active Directory domain utilizing a Windows 2012r2 DHCP Server via ethernet - most cabled, one wifi. ...
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16 views

Why can I boot and install windows from a MS MDT server, using ISC for the dhcp server, but only under lageacy bios, not UEFI?

Setup is: Windows 2012 R2 with MDT 2013 Ubuntu Server 14.04.2 running ISC dhcp Client can be VM/Hardware doesn't matter. If I stay in legacy bios mode things work splendidly. When I switch to UEFI, ...
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34 views

2008R2 DHCP Server Becomes Unresponsive

At the end of 2013, our single Windows Server 2008R2 DHCP server started becoming unresponsive once every week or so. The server itself was up, but the DHCP server was unresponsive. Attempts to ...
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132 views

Ubuntu 14.04 can only access outside networks if using DHCP, not static IPs

I am configuring some server on Ubuntu Server 14.04 (no GUI) and I am have the following configuration: auto lo iface lo inet loopback ## Management network eth0 auto eth0 iface eth0 inet static ...
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DHCP no longer available using ethernet over power [closed]

I have been connecting my PS4 at one point in my house via EoP, similar to this model (mine is just an older model): http://www.netcommwireless.com/product/powerline/np207 This was working fine ...
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14 views

IPv6 DHCP for Hyper-V Guests

I have the following configuration: W2K12 with Hyper-V and DHCP Role installed, and I have IPv6 block. The goal is to assign IPv6 via DHCP to guest VMs, and make guest VM to have access to the ...
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26 views

Two DHCP servers in one network [duplicate]

I have two ISPs, two DSL routers (both can work as a DHCP server) and I'd like to set up multi homed routing. The network looks a like this: ISP1 <-> Router1 <-> Switch1 +- Server ...
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1answer
24 views

Stuck with Cisco DHCP pool issue

Yes, I have searched, googled, sworn, googled more but have not quite found the answer I need, .. I have also posted this on a Cisco forum but, as I discovered at stackoverflow, the Stack* forums ...
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9 views

How can I assign an IP by UID in DHCPd

Here was answered how to assign an IP by MAC address. I want DHCPd server to assign IP by UID. Can i just add record to dhcpd.conf in the same manner? For example: host example { uid ...
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1answer
11 views

Change DHCP on server 2k3

Ok I am trying to mess with our dhcp settings on our domain server because at this point we kinda have competing dhcp servers between the router and the server. (Long predates me and I have finally ...
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18 views

dhcp relay with failover to local service

I'd like to set up a dhcp server which normally relays to a central site, but has a pool of addresses to hand out if the link to the central site goes down. I'm using isc dhcp server on Debian, but ...
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1answer
19 views

CentOS as a router — Can't get static IP adress for Internal Zone

I'm trying to make a router with a CentOS 7 box. enp2s2f0 ---> External Zone ---> directly connected to the internet. enp2s2f1 ---> Internal Zone ---> Connected to a PC (will be connected to a switch ...
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20 views

DHCP Policy based on CalledStationID / SSID

Setup: Server 2012R2 Server1: DNS, DHCP, NPS WLAN-Acces point configured as radius-client with two SSIDs 1 DHCP-Scope (lets say 192.168.0.1/22) SSID1-users should be assigned to DHCP-Subscope1 (lets ...
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8 views

Group reservations in Windows Server 2k12 R2 DHCP

I am moving a mixed network from a Linux DHCP server to a Windows 2012 DHCP. Because of some of the applications our Linux users need, we need to specify different DNS servers for Linux and Windows ...
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1answer
40 views

Multiple DHCP uplinks - How to ignore DNS and default route on all but one?

A multi-homed box needs more than one uplink to be configured for DHCP. It needs to ignore default-route and DNS for all but one DHCP uplink. There is a similar question here [ Debian interfaces file ...
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24 views

DHCP from Cisco 1921 failing after switch nr 2

I have a network which uses a Cisco 1921 router. The router is connected to a Dell Powerconnect 2848 switch and from that switch is a connection to a small SOHO Planet switch which 3 computers connect ...
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22 views

“Register this connections address in DNS” - unable to automatically tick this box with a VPN connection

Hoping you can help. We have about 70 Microsoft Surface's in our network and they all have a VPN connection that is deployed from our SCCM 2012 Server. the problem I have is they will not update DNS ...
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5answers
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How does a router get its IP address assigned?

I understand how a device connecting to a router (e.g. 72.73.74.75) gets assigned a local IP address (e.g. 192.168.1.5) using DHCP. BUT, how does the router itself get the IP address assigned from ...
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3answers
40 views

How do I configure all clients use proxy with out making changes to thier configuration

I am looking to configure a content filter for my network. I have squidgaurd configurared and working. I would like to have all clients use it. This includes clients I have no control over (BYOD ...
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3answers
168 views

Phones on some switches cannot complete DHCP process

Background I have a Windows DHCP server (Server 2008 R2) handing out addresses for several scopes. One of those scopes is for some Mitel IP Phones. The phones are configured to use dhcp option 125 to ...
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1answer
28 views

cobbler managed dnsmasq is not listening on the correct interfaces

I have a cobbler server I am trying to get installed. Unfortunately dnsmasq is not listening on the correct interfaces. It should be listening on my 192.168.10.2 network which is assigned to br1 ...
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1answer
33 views

dhclient.conf missed on centos

on centos 6 I need take the values from a dhcp server: cat /etc/sysconfig/network-scripts/ifcfg-eth0 DEVICE=eth0 HWADDR=00:50:56:27:0E:C8 TYPE=Ethernet UUID=20924b21-e92a-4944-a054-06d1967155c1 ...
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1answer
139 views

Possible to have DHCP hand out different DNS server address when using different tunnel?

We have several ASA 5505 deployed. Currently, we have a setup where the local ASA is answering DHCP queries and is configuring clients with two DNS servers: our DR site DNS server (we use AD) and a ...
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29 views

Workstations connected to SBS 2011 can not connect to “http://connect/” and are getting frequently disconnected or kicked off of the shared drives

Small Office, there are 7 computers and a server running SBS 2011. 2 workstations are not currently bound to the server, because after recently reinstalling windows 7 on them, it was discovered that ...
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1answer
164 views

Can vSphere PowerCLI cmdlets execute from a PS1 file?

I'm looking to write an admin script that will: Delete a VM from vSphere Delete the VM's DNS entry Release the VM's IP address with our Windows DHCP server I can accomplish the first item via ...
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79 views

Duplicate MAC address, can be blocked?

Let's say we have DHCP server and provided MAC filtering system. Can we blocked the next spoofed MAC address? The next device will not be leased any IP address. Or normally it is already blocked by ...
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26 views

DHCP relay offer packet dropped

I'm trying to get DHCP relay set up on our Cisco SGE2010P switch. Sadly, we can't afford a catalyst switch right now. It looks like I have everything configured correctly, but something is going ...
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30 views

OpenVZ, veth interface and getting ip from dhcp from the inside of containers

I have OpenVZ server (centos) with one interface eth0, also I have dhcp server in the same network. I need container with ip from dhcp server. So, I created guest node with the veth interface, after ...
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1answer
43 views

AD Dynamic DNS not working with Linux IPv6

I have an AD DNS/DHCP enabled server. I have mixed Windows and Linux machines/servers. IPv4 is working great with DNS/DHCP, even for the Linux systems. IPv6 is working great except that it won't ...
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32 views

Windows Server 2008 reboots when DHCP server is down

I have two Windows Server 2008 servers. Both of them have static ips, both of them are domain controllers. The first one run a server based software, the second one is our dhcp server. Some times the ...
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51 views

Assign IP not defined in a subnet range dhcpd [closed]

I look to deploy a DHCP server for a network of VMs that spread over various subnets. The DHCP server will not be used to assign dynamic ranges, but only static IPs based on the host MAC address. Is ...
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1answer
44 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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11 views

pfsense router dhcp “periodic error: no ip”

A simple /20 subnet with aprox 300 users. All DHCP. One LAN only Sometimes some of the users report that they get no IP. After minutter or as long as an hour they regain access. Unfortunately ...
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1answer
173 views

Recommended DHCP and DNS setup

I've been tasked with sorting out my office network. Presently there is no internal host name resolution. Presently the DHCP server is on a Cisco security device and we are using an external ...
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1answer
32 views

Is there a way to send out a discovery packet?

Is there a way to make a client send out a DHCP discover packet, but not respond to the DHCP offer packets it gets in response? That way you would be able to check the addresses of all responding DHCP ...
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55 views

Windows DHCP client only using one DNS server?

I have a PC running Windows 7 professional. It is a DHCP client. The DHCP server is sending it two DNS servers. This has been verified with packet captures. However, after running ipconfig /release ...
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2answers
77 views

Supersede default route

I have two network interfaces eth1 and wlan0. I would prefer all outbound traffic to go through eth1 before wlan0, but if eth1 is not up, and then wlan0 should handle the traffic. Both interfaces get ...
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1answer
137 views

AWS Override VPC DHCP - Additional Option Sets for RRAS VPN Clients

I am trying to run a RRAS VPN server that pulls from a windows DHCP server running on the same box. I am finding that the AWS DHCP is getting hit first with the DHCP request and it provides invalid ...
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33 views

Small Office WiFi config for iPhones

I purchased an ASUS RT-AC66u wireless router for use in a small office. I have the router configured as an access point, DHCP is turned off. It is using a static IP of 10.10.10.251. My DHCP server ...
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1answer
73 views

WDS PXE Server occasionally returning bad IP

We have a very complex network boot environment to keep traffic separated for our imaging networks, which process hundred of machines an hour. We use the WDS Server Selection menu tweak ...
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28 views

DirectAccess Multiple Subnet Deployment

I am looking at doing a DirectAccess rollout on AWS using a single Server 2012 R2 instance behind an edge device. My clients are mostly running Windows 7 Pro/Ultimate, but there will be some other ...
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1answer
176 views

Windows Server 2012: DHCP: Android Clients have no access to the internet

I am using a Windows Server 2012 R2 as Domain Controller, DHCP Server, DNS in my network. My Router is the gateway which is connected to the DSL modem. Some Clients (all android devices) and the ...
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1answer
49 views

Excessive DNS Update requests

I have a curious situation and I can't find any good reason why its happening. Its not causing any noticeable problems, just something I'd like to resolve. From my Server12 dhcp logs, these entries ...
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1answer
46 views

How do I properly configure host server net adapters when using Hyper-V?

I am converting a number of physical servers to virtual ones, and I have a question regarding configuring the physical adapters on the host server. I am new to virtual machines, and have a nagging ...
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1answer
128 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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1answer
38 views

How can I implement DHCP so that all users on a domain can get one pool of addresses and the rest get another?

For example, having the domain users/machines on the 192.168.22.x subnet and the rest of the non-domain users and machines are on say, the 192.168.30.x subnet. I'm running Windows Server 2008 and the ...
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5answers
188 views

What happens if ISPs mess up IP allocation?

I've been wondering about this for a long time but never really got around to asking it. I know that a lot of companies were initially assigned IP addresses within the /8 (Class A) range and a lot ...