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Questions tagged [dhcp]

DHCP stands for Dynamic Host Configuration Protocol and is an auto configuration protocol used on IP networks and an extension of the Bootstrap Protocol.

The Dynamic Host Configuration Protocol (DHCP) is an auto configuration protocol used on IP networks and an extension of the Bootstrap Protocol. DHCP allows for computers to be configured automatically to communicate with each other over an IP network without the need for manual setup by a network administrator.

The implementation of DHCP relies on a DHCP server to hand out network configuration information to DHCP-capable clients that request an IP address (and other information required or useful in communicating with other devices on an IP network). In addition to an IP address, common configuration information served over DHCP includes a default gateway, subnet mask and DNS sever(s), though there are many more possible configurations that can be sent out using the DHCP protocol.

More in-depth detail on DHCP and its implementation can be found at Wikipedia.

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Connection problems with DHCP solved setting a DHCP client ID. Why?

We are using DHCP in the office and from time to time when I try to connect for first time, my connection is stuck: I get an IP from the DHCP server but the connection doesn't work (I keep the ping command running to check that). But "magically" I…
srus
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DHCP scope static routes lost when updating network adapter

When enabling 'use this connection's DNS suffix in DNS registration' locally on a machine (Server 2012 VM) for dynamic DNS updates, the classless static routes configured from a DHCP scope (from 2008 R2 DC, in a different domain in the forest) are…
user162284
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Need to split a high speed ADSL line for several departments

I'll try to keep it simple! We have a new and very fast ADSL line coming in to our office which needs to be split between 4 different departments. Each department will have a certain bandwidth available to them and we want them to have a separate IP…
user395619
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Is there any implication of having 2 authorized DHCP servers listed with the same address?

These are Windows Server 2008r2 machines in an AD environment. Some time in the past a DHCP server failed. An admin replaced it using a different host but the same address. Later on, when troubleshooting a rogue DHCP server, it was discovered that…
Matt
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DHCP Lease Static IP

Simple question but I've looked around for an answer on this. I add a hosts {} section to dhcp.conf to generate a static IP in a subnet. When a machine starts and is given this reservation, does this generate a 'lease' entry in the lease…
ascotan
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Unable to Image Computer from Windows Deploy Service (Missing IP from DHCP?)

so I'm trying to get a Windows Deploy Server up and running to deploy Windows 8.1 to a new HP computer (no OS previously installed), and I thought I had, but I keep getting an error every time I try to image a computer. The Setup: I'm working with…
Sfagin
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how to stop multiple IP Address been issued to clients

Greeting Guru's I am using CentOS DHCP and DNS Server. Recently, I have notice that the DHCP has been issuing multiple IP Address to some clients (Phone/Laptop). This has caused IP Conflict in the network. How to Correct this? Thanks in advance…
monketrip28
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WDS Server - How does DHCP scope option 67 work?

What is the purpose of DHCP option 67? I thought the PXE client will look for a boot.wim file. Does the boot file located in 67 (like boot\x64\wdsnbp.com) go out and search for the boot.wim? What does DHCP scope option 67 actually do and why do we…
user1330287
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DNS zone scavenging keeps incrementing date and time

my DNS scavenging is not working as I expected. I have setup DNS scavenging like this on all of my domain controllers: No-refresh interval: 4 days Refresh interval: 4 days and under properties --> Advanced I have Scavenging period: 7 days My DHCP…
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Calculate DHCP lease creation time by subtracting lease time from expire time

I am writing a script to export information regarding all active DHCP leases on a server and I would like to have the timestamp of when the lease was created. Unfortunately, the DHCP service we use does not provide that information, only the expire…
ecnepsnai
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resolv.conf empty and not using dhcp nameservers from lease

I have a server that doesn't update resolv.conf correctly when networking is restarted. This is a red hat 7 server. It should use the nameservers from dhcp. I checked /var/lib/dhclient/dhclient--eth0.lease and there is a line option…
Matthew
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DHCP Windows Server can create multiple scope same subnet?

I have one server DHCP Windows Server 2012 R2. Can I create the scopes : Scope A : 10.10.10.11 - 10.10.10.30 Scope B : 10.10.10.31 - 10.10.10.55 Scope C : 10.10.10.56 - 10.10.10.105 Scope D : 10.10.10.106 - 10.10.11.254 subnet mask :…
Egire
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WDS on windows server 2012 R2 DNS and DHCP problems

Intro: I have 1 server with an onboard NIC and 1 usb NIC, the onboard NIC is for network 1 (my home network) and the usb NIC is for network 2 (my virtual network) so they are separated and do not interfere with each other. Virtual program: I use…
Gandalf
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WDS+DHCP+PXE in vSphere 6

I have a Windows Server 2012R2 virtual machine running (vm1) on host1. with two networks. The first network is for normal production traffic and the second one is configured for DHCP/PXE. When I create a new VM (vm2) and place it on the PXE network,…
StackExchangeGuy
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dhcpd.conf DNS order is being reset after each cobbler sync

I'm trying to switch the order of DNS servers that my clients machines use by editing the /etc/dhcp/dhcpd.conf file in cobbler. This was the settings before I attempted the change: subnet 10.100.48.0 netmask 255.255.252.0 { option routers …
treetop
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