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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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Some subnets not populating DNS as part of DHCP

I have a Windows 2016 server acting as a DHCP and DNS server for a small network. I have it configured such that when a client gets DHCP, it adds the client to DNS as well. This works great for the local subnet, but for the two subnets that go…
Brad Silva
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DHCP Client starts sending DHCP Discover messages upon receiving a NAK from another DHCP server

I am trying to set up a DHCP client that is supposed to get its IP address via DHCP. I have configured two DHCP servers (one in 192.168.X.X pool and the other in 162.16.X.X pool). Then, the client starts the DHCP protocol and obtains a DHCP lease…
Anand Gokul M
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Configure nginx webserver to allow being accessed locally using hostname instead of IP

I can access http://10.120.11.31/ from a browser, but cannot access http://mybox/. The device is a raspberry pi and the webserver is nginx. I would rather not install a dns server on the device, and thought that putting 10.120.11.31 mybox in…
user1032531
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Cisco 1811w + dual wan failover on DHCP ISP

Ok so my setup is, I have 2 vlans currently routing through fa0 on cable internet with DHCP. I want to be able to plug dsl, also dhcp, into fa1 and have it work as an auto failover if fa0 goes down. I am just not sure of how to proceed. All the…
Matt Morrow
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Using 2 redundant Servers to Netboot Devices over network

Is it possible, and how would you go about doing the following. I have 2 Servers ( 1 is primary and other acting as backup) and many devices connected to these servers. I would like to set up Netbooting ( perhaps using PXE,DHCP or other…
Alex C
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Cisco 2960 switch mode access cannot assign IP address for virtual machine

we are testing the VMware setup in our lab. We have a 2960 switch connect to a PC. Inside the PC, we have VMware workstation 11 installed. When I setup the NIC of Virtual machine (Win7) as NAT, it can automatically be assigned an IP address, but if…
SpiderlinK
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DHCP allocating 2 different IPs to same box with two network ports but same name?

Is there any way to tell DHCP or DNS to name IPs on the same box different. I have a win2k DHCP server that is correctly allocating different IPs to two network cards on the same Win2003 box. So I get 10.0.0.128 Solve50 10.0.0.129 …
kingchris
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How do I setup a secondary default gateway using classless-routes in isc dhcp?

Here is a snippet of my dhcpd.conf file subnet 10.3.0.0 netmask 255.255.0.0 { option classless-routes 16, 10,2, 10,3,0,110,16,10,4,10,3,0,110,0,10,3,0,110; } It generates the following routes default via 10.3.0.110 dev eth0 10.2.0.0/16 via…
Wayne Gemmell
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Would a static IP make PC go online as soon as router become available/ready?

I have posted a part of this question here and now what Im questioning is an answer suggested - to create a static IP. Question in short: I have a headless PC(running Ubuntu) and I want to make this go online as soon as the router becomes available.…
OverTheEdge
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UEFI PXE booting across subnets

I'm trying to boot PCs from a Windows 2012R2 WDS server in UEFI mode. If, and only if, the client is in a different subnet from the DHCP/PXE servers, this fails with some of them. (It always works in BIOS mode, but I need UEFI.) The symptom is that…
Christian
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Prevent DHCPDISCOVER on other interfaces

On a Debian multihomed server, both interfaces eth0, eth1 are configured for DHCP. When the second interface (eth1) is bought up after eth0 is active, the DHCP client is sending out DHCPDISCOVER packets on both eth0 and eth1 interfaces. How can I…
300baud
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Wireless clients getting ips my router is not assigning

I'm running a small network with a peplink router and unifi access points. The wireless network is a vlan than has no access to the main network. For some reason that I can not figure out, some random devices are getting a different subnet of ips…
ahackney
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How do you configure static DHCP (based on MAC addresses) on Adtran NetVanta 3200?

we have an Adtran NetVanta, and I was wondering how (if possible) to configure static DHCP entries for specific devices on the network? The NetVanta 3200 is running OS v15.08.00. Thanks!
zagman76
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Can a DHCP IP Lease timeout cause odd network dropouts?

I have just taken control of a small-ish company network (1 server, 60 workstations) They have been experiencing periodic file server dropouts, and I just came across this situation: The internet router is handling DHCP (Which will be moved to a…
Digital Lightcraft
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Centos7 - link up, but no DCHP, unable to bring up next working interface

I have following configuration: server has two network interfaces, both are attached to switch (and will become LOWER_UP after been made up). One of those interfaces will have DHCP server with a lease. Other interface will not provide me with…
George Shuklin
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