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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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Scope reconfiguration - decreasing subnet mask and ip range

i've been asked to change my subnet mask on our network from a 255.255.0.0 to a 255.255.255.0 (we are using DHCP and are using windowsServer 2012). - this should not be an issue for the number of users, however i'm concerned what issues may occur…
m.nadeau
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Enforce a client hardware address via DHCPv4

Is there a DHCPv4 option that allows a client to tell the server never or at least for some time to deny any other client hardware address than its own? I'm looking for a way to deny any other host to get the management address the ISP assigns via…
user2964971
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registering hostname using DHCP

I am working on the development of a network device. When it boots up, I want it to register a domain name on the network so that a customer can easily browse to the webserver interface. Eg. http://device-name I tried including the hostname in DHCP…
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Add IP address to lease list on SBS 2003

I've deleted an IP address by mistake from the DHCP Address Leases list on Small Business Server. Is there a way to get these back or restore them? I've tried, but to no avail.
RKid
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Router can connect to internet but clients intermittently can't get beyond the router

Currently working with a small business which is using an ISP supplied domestic ADSL modem/router to connect their internal setup to the internet and this is also being used for DHCP. They're having repeated problems where 1 or more clients lose…
yknivag
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powershell: Remove-DhcpServerv4Lease does not remove existing leases

I want to delete all DHCP leases and reservation from server WSKELLER. From the documentation I seem to understand that this would be accomplished with: Get-DhcpServerv4Scope -ComputerName WSKELLER | Remove-DhcpServerv4Lease -ComputerName…
aag
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Sending custom DHCP option to server with dhcpcd

I've been trying for several days to configure dhcpcd to send a non-standard option to a DHCP server without any success. On the other hand dhclient works fine. I need to send an option with code 90 which is a string specified in hex. The following…
André Borie
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VM acting as DHCP/PXE server in virtual network?

I'm working on a proof of concept for running Stacki, a DHCP/PXE server which serves out Kickstart PXE boot configurations to VMs within a given subnet. What I'd like to do is setup at least two libvirt VMs, where one is the Stacki frontend managing…
Naftuli Kay
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DHCP server assigning same IP address even if Computer is connected in different VLAN

DHCP Server OS - Windows Server Standard 2008 R2 DHCP Client OS - Windows 7, Linux based OS etc.. I have configured DHCP Server on Windows Server Standard 2008 R2 with SuperScope. Let assume that i have two Scope in SuperScope. VLAN 8 and VLAN…
Param
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Set an network interface in FreeBSD as DHCP-enabled, but totally silent until explicitly enabled

I'm setting up a FreeBSD carp router/firewall backup, my provider is giving out IP by DHCP, it's static and tied to MAC address of my NIC, so when carp switches state I'm trying to switch off the interface on one machine and switch it on on another.…
Eugene Petrov
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DNS Server list not updating after DNS migration

Toady I'm migrating a DNS/DHCP server from Server 2008 on Xen to Server 2012 R2 on VMware. Things went ok for the most part. DHCP is working just fine and has been tested. I manually set one test machine to point to the new DNS server and tested…
trademark
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DHCP server not found during PXE boot

I'm trying to run a PXE server and encountering the “PXE-E51: No DHCP or proxyDHCP offers were received” error, which usually means that: the PXE client did not receive a reply to its DHCPDISCOVER message. Possible causes for this problem…
Arseni Mourzenko
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Two subnets, two DHCP servers. How to stop both DHCP servers from responding to requests from both networks?

I have an environment with two subnets 192.168.1.x/24 and 192.168.2.x/24 Each subnet/network has a Cisco RV082 router as the gateway and a domain controller in each environment that also has a DHCP server on it. The Cisco RV082 routers are…
qroberts
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De-authenticating Wi-Fi without turning off the device

I have established Wi-Fi access point using hostapd and the IP address is configured via DHCP. This is my configuration…
Nerdy
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Windows Server 2012 DHCP not working sometimes

Currently on my network I have Windows Server 2012 setup with DNS, DHCP, and Squid Proxy. Most of the time when my clients connect to the network the DHCP server won't hand them an IP address, leaving them with an auto-configured address…
Gabe Zimbric
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