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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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DHCP in Windows Server 2008R2 don't show leases, from a 2003 i can see them

I inherited a network where the Domain controllers where recently upgraded from 2003 to 2008R2. After the upgrade the DHCP MMC don't show the leases in several of the scopes, only showing a message of "There are no items to show in this view." All…
Hugo Hernan Buitrago Rios
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DHCP Server with multiple scopes. Which one does it use to handout an IP?

I have 4 DHCP Scopes. 10.200.0.0 <--------DHCP Server Lives Here 10.54.0.0 10.16.0.0 10.32.0.0 A DHCP broadcast request is sent to my DHCP server. How does it decide which scope to pull an address from? My problem is that a client that should be…
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Debian interfaces file - ignore gateway and dns entries from dhcp

In gentoo, this is as simple as: dhcp_ethX="nodns nogateway" How should I go about this in the interfaces file?
Karolis T.
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IP Address keeps getting assigned that is already in use

I have an internal IP Address (192.168.0.57) that every couple of days will get assigned to a machine which will then periodically lose it's connection to the network throughout the day. The first machine that this happened to was running OSX and…
Kalamane
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ISC DHCP+BIND with failover and dynamic updates, can the secondary bind update DDNS?

I'm setting up a failover system for DHCP and DDNS. The software being used are ISC BIND and ISC DHCP, running on Ubuntu 10.04 LTS. serverA runs DNS01 and DHCP01, serverB runs DNS02 and DHCP02. DHCP failover is set to a 128-bit split (half the zone…
pauska
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Static IP Address assignment vs DHCP address assignment

I manage a small-ish network that consists of less than 70 nodes. The previous system administrators opted to have a dhcp server and manually set dhcp addess. I have opted to rather use dhcp address assignment instead of static address assignment…
biosFF
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Need help understanding Windows DNS, DHCP and dynamic PTRs

I have inherited management of a set of AD servers running AD-backed DNS. One of them is running DHCP. For IP ranges which are served by this Windows DHCP server, the in-addr.arpa zones are being served authoritatively by the AD DNS servers to…
jj33
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Why won't dhclient use the static IP I'm telling it to request?

Here's my /etc/dhcp3/dhclient.conf: request subnet-mask, broadcast-address, time-offset, routers, domain-name, domain-name-servers, domain-search, host-name, netbios-name-servers, netbios-scope, interface-mtu; timeout 60; alias { …
mike
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Some DHCP clients end up with wrong DNS server

The scenario: DC running Windows Server 2008 R2 providing DNS + DHCP Cisco 1811 Router as the gateway 30 Windows XP DHCP clients on the LAN The problem: Some workstations are spontaneously switching to an incorrect DNS server. Specifically,…
Nic
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Configure multiple search suffix domains in Unifi Security Gateway (dhcp option 119 domain search)

I would like to have the DHCP server in my Unifi Security Gatway include multiple domain search entries as part of DHCP option 119 so that I can use shortnames for multiple suffixes like: host -> host.example.com anotherhost ->…
Greg Bray
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Virtualbox VM only getting IPv6 over bridge connection. How to get IPv4 address

I have launched Ubuntu16.04 in Oracle virtual box on windows 10 machine. I have used two type of adapters: NAT and Bridge Connection. The ip address on Bridge connection is getting IPv6 address and not IPv4. I have already tried updating preference…
Munish Mehta
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BIND: DNS failover and high availability with dynamic updates

I am trying to design a system with 2 servers that act as both DHCP and DNS servers with dynamic updates. I am using ISC DHCP and BIND9. It looks like this. Server1 - DHCP primary and DNS master. IP address - 10.99.99.11 Server2 - DHCP secondary and…
Ruben Tsirunyan
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Ensure Macs get correct machine name from DHCP?

I have a problem in our network where our Mac's occasionally get given the wrong machine name while, I guess, getting a new DHCP lease. The DHCP servers are Windows based - the bulk of our network is Windows, but we have some Linux machines and an…
Greg Whitfield
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Can't start isc-dhcp-server because of the Error : Not configured to listen on any interfaces

I try to set up a wifi access point with hostapd and isc-dhcpd but the dhcp server dont work.The conf file is the same i found in this tutorial: [Hostapd : The Linux Way to create Virtual Wifi Access Point][1] !!!!ok i think i wont get any help…
ABeater
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How to extend IP Range from 192.168.1.1 to 192.168.2.254

Here's my question. I currently have a network setup to have Static IP manually assigned between 192.168.1.1 and 192.168.1.99 and the rest (192.168.1.100 through 192.168.1.254) assigned automatically by DHCP server hosted on a IPCop server. Now, I'd…
Marc-Andre R.
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