Questions tagged [dhcp]

Dynamic Host Configuration Protocol; allows computers on the same network to automatically obtain unique IP addresses and other network configuration parameters.

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Windows 10 DHCP stopped working properly and I can't restart it

For some reason Windows DHCP service, for both IPv4 and IPv6, bugged by itself in one of my laptops, because the network adaptors can't receive correct settings anymore. My internet gateway IP is 192....
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How can I assign an IP without DHCP enabled on the router and no static IP configuration possible on the device itself

Situation I have a Chromecast that I want to connect with an ethernet cable. So I've bought an ethernet to micro usb adapter. I plug the ethernet cable into my router but the chromecast will not get ...
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DCHP Server only shows website [closed]

After creating 2 websites using web server in Windows Server 2008, DHCP Server only shows the first site I created and nothing else. How can I fix this?
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Force to use MAC address as DHCP client ID on Debian Buster

Debian Buster dhclient randomly uses its MAC address or a generated DUID-LLT as its DHCP client ID. Can I force it to always use MAC address instead of the generated DUID-LLT? I know the option send ...
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36 chars MAC addresses on Windows Server 2012 DCHP server

When I connect devices on my network, the DCHP server running on a Windows Server 2012 sometimes reports their MAC address correctly (12 characters), but sometimes it reports their MAC address 36 ...
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Does an off-the-shelf router have all LAN ports bridged?

I want to roll my own router, as the one provided by my ISP is terrible. The router of course provides DHCP and routing on all 4 of the LAN ports. Does this mean that it provides DHCP and routing on ...
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DHCP Reservations and ARP Binding

Is there any reason to not use DHCP Reservations and then add the same IP/MAC address combination in the IP-Mac binding in a TP-Link Archer router?
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DHCP Lease time renewal with ISP

Recently my ISP had a major outage and since they came back up I have been having issues with DHCP leases. I am currently using a DLink router with FreshTomato and there were no such issues before ...
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Since activation of IPv6 on Win7, VPN routing fails + wired link DHCPv4 fails

I have an ISP box connected to a Netgear WiFi router. Internet <-->[WAN] ISP box [LAN]<-->[WAN] Netgear router [LAN]<-------> Win7 laptop 192.168.0.x/24 ...
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Setting up two separate APs to 1 router within the same subnetwork

My home network situation is as following (simplified): I have one main router (with DHCP on) and want to have two routers in AP mode (with DHCP turned off, connected via LAN ports) within the same ...
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DHCP reservation is active but user's laptop has a different IP

I am learning how to use Windows Server 2016. I created a Server 2016 and Windows 10 client in Oracle VM, set up AD DC, DHCP server and created a reservation for a client. The client computer is in AD ...
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Ubuntu PCs are unable to configure with IP address from DHCP server

We are trying to setup VLAN network in our institute. We have Cyberoam firwall (Model CR300iNG) where we have configured VLAN and DHCP server. When we connect any Ubuntu PC over VLAN network it is ...
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Why does the IP assignment in my router fail (only for my server, it works fine for everything else)

I just bought an old IBM X3650 M2 and installed Ubuntu Server 20.04 LTS. My router (Netgear R7000) is not obeying the IP rules I set in the router setup (and so far, I've only noticed this for this "...
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WICD Network Manager: Takes over a minute to cancel a network connection attempt. Forced to wait for DHCP client to timeout

Debian Buster XFCE using WICD. I do a lot networking work: setup and diagnosis of routing and switching. As such, it's not so rare that I ask WICD to connect to a network that has no functioning DHCP ...
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How should I distribute IPv6 addresses to a home network?

(this was flagged as off-topic over at Network Engineering, and suggested to move here) I have finally got an IPv6 address for my network. Being able to do VoIP and peer-to-peer networking without ...
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Windows 7 Suddenly cannot connect to LAN

I have a problem connecting my Windows 7 (64bit) PC to local home network. Let me start by saying until yesterday everything worked fine!!! Yesterday I noticed that my internet became slow(ish). I ...
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Cant access router configuration page but internet can b accessed from one device, from another device its vise versa

I have two routers, router A has the internet connection and I made the router B as extender/repeater. Router A IP is 192.168.1.1 Router B IP is 192.168.1.2 I saw that the DHCP has to be disabled in ...
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Unidentified Network - Local Area Connection cannot be renewed - timed out while contacting DHCP server

For over a day now, I have been confronted by an Unidentified Network and that dastardly yellow triangle about the connection icon! Below, as you can see, I have attempted various solutions to this ...
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Requirements for IPv6 Customer Edge Routers - Why is router required to initiate DHCPv6 prefix delegation on WAN-side when RA was received?

RFC 7084 describes Basic Requirements for IPv6 Customer Edge Routers. One of those requirements on the WAN-side is the following: WPD-4: By default, the IPv6 CE router MUST initiate DHCPv6 prefix ...
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Same PC, Same Router, WiFi gets DHCP IP, Ethernet won't

I have a brand new Asus ZenWiFI XT8 mesh system set up and working ... for the most part! My main PC has 2 interfaces: Ethernet & WiFi. WiFi is connected and gets an IP from the router. The ...
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Correlation between DHCP and ARP

Can someone explain why there are so many ARP packets broadcasted from my client? And why is looking for my DHCP server?
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How to renew a client DHCP address with an OpenWrt router?

How to renew a client DHCP address with an OpenWrt router, from its SSH terminal session?
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/16 Subnet on home network not working

I am new to subnets and apologize for the lack of knowledge. I have moved home networking IP addresses to the 10.0.x.x range for a few different reasons. On my routers settings, I changed the DHCP ...
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IPv6 - When is the “Managed address configuration” flag (M flag) of a Router Advertisement (RA) actually used?

Before creating a Non-Temporary Global address with DHCPv6 (RFC 8415) or SLAAC (RFC 4862) a Link-Local address has to be created and as far as i know, this mostly happens with SLAAC in which an ...
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Can not access a dhcp disabled router

I disabled the dhcp server of a router because I wanted to extend the network by connecting this router to another main router through an Ethernet cable and wanted to use same network IP addresses ...
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Windows Host, Linux guest. Reserve IP address for Nat IP address on VMware Workstation

Ubuntu 20-04 Guest OS My Host is Windows 10 Using VMWare Workstation Tech preview 20H1 I'd like to ensure that ip address X is static, i.e always the same for a particular VM client X eg my Ubuntu ...
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DHCP Client List include different IPs for the same MAC. Is it a bug?

Previously I tried to ask this on Network Engineering but they closed as off-topic. I relied on this meta topic when posting there. I have an issue with Netis N4 Wireless Router which looks like a ...
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MAC Address issues while running DHCP server inside Ubuntu virtual machine

I have a Linux based gateway device which I can ssh via Ethernet. Its network interface is configured as DHCP client(I cannot change this config). As I do not have an Ethernet switch/router , I need ...
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How does DHCP OFFER broadcast work?

I am trying to understand the concept of DHCP relay agents and was reading this article. In section 3.2, talking about DHCP OFFER, it mentions that the DHCP relay agent replaces the destination ip to ...
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Trouble switching mobile device between two access points

In order to extend my WIFI coverage I have recently added a new Access Point to my installation. [Main Router] 192.168.10.1 | ├── /* Ethernet devices */ ├── Wireless Access Point #1 - ...
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Can not access internet through VPN - SoftEther VPN Server , Windows 2012 AD/DC

I have tried looking at many forums but not able to find a solution that can work in my setup. Please help! My Setup: A domain controller is Windows Server 2012 R2 (a VM in VMWare ESxi) with no ...
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How do I perform DHCP reservations using HyperV in Windows 10 Pro?

I've recently had to move from the Linux/libvirt world to a Windows 10 Pro system utilizing HyperV machine for some testing, and frankly don't know what I'm doing. I have a CentOS virtual machine ...
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Is there a risk in letting DHCP set the IP address of an access point?

To get better Wi-Fi in the attic, I have installed an access point connected by cable to my downstairs router. I have done this before, setting the IP address of the AP to a fixed address outside the ...
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What is my LAN card's MAC address?

EDIT: I meant wifi card, not LAN card. I want to connect wifi devices (printer, phone, etc) to my Windows 10 laptop. I want to used a reserved DHCP address on my router for the wifi card (not LAN ...
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DHCP is not working on Digital Ocean droplet due to cloud-init

I had setup a droplet in Digital Ocean with a custom image of the Kali Linux distribution using instructions from this page on kali.org After deploying the image to the droplet and starting the ...
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DHCP server on access point seems to block any access to the internet

I am trying to build the following network: ADSL Modem > Various Machines (Wireless and Wired) > Switch > Wifi Access Point with DHCP Server > Various machines connected by ...
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Windows 10 hostfile url to IP address of machine

Is it possible to use a fixed url to redirect to the IP of my own PC? I use DHCP and I have no problem with it but would like to use an url i.e. "server.local" to reach a web server deployed on the PC ...
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How does DHCP handle multiple scopes in the same subnet

We are studying DHCP in our networking class and I have a Virtual Box in which I have set up 2 VMs - one of them is a Windows server and other is a Windows 10 workstation. I have added the DHCP ...
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Why are DHCP messages broadcast?

I am learning DHCP in my networking class and as a part of my research, I was watching the following video: https://www.youtube.com/watch?v=0UvLRVlPx6A So in the Wireshark capture in the above video ...
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DHCP server not being used by a client

I have created a DHCP server in server 2012 with an IP of 10.0.2.15 but when I click obtain dhcp on the client's computer, the default dhcp server it gets is 10.0.2.3. How to point the client to ...
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unable to start isc-dhcp-server

I am unable to start isc-dhcp-server. When I run the command to start the dhcp-server. I get the bellow error pi@raspberrypi:/etc/dhcp $ sudo service isc-dhcp-server start Job for isc-dhcp-server....
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DHCP Issue on ubuntu 18.04

my server (Dell PowerEdge 2950 III) I set it up with ubuntu server 18.04 but I have one problem. My server doesn't get an IP automatically but when i connect my macbook or run: sudo dhclient eno1 ...
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LXD container doesnt pick up an IP

We are using a virbr0 bridge and assigning ips to our lxc containers, we have a cluster of 7 machines, all 6 machines assigns an IP which is pingable from the outside. One of the node doesnt provide ...
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Why my IPv6 address disappear after 1 hour?

when I connect to my router, I get assigned with IPv4 and IPv6 and it works. But after exactly an hour or so, my IPv6 address disappears and now I only can connect with IPv4. If I re-connect or reboot ...
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Why would a PC be on a different subnet?

There are several devices connected to my home network, some wired, some wireless. With the exception of one PC, they all have the same subnet mask (255.255.255.0), default gateway (192.168.1.254) and ...
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How to define nisp-domain-name in Centos 7 DHCP server

Above is the config that is one in the windows dhcp-server, I want to do same config which is marked in RED. I've gone through almost every document. below is the one show on the official document ...
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Snort causing DHCP ACK spam in VirtualBox internal network

I have an internal network (10.10.0.0/24) in VirtualBox which has been configured with a DHCP server using VBoxManage. There are 3 VMs on the network, Ubuntu 16 (10.10.0.2 & 10.10.0.5), Ubuntu 18 (...
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Why do some devices not show up in the connected clients list on my Asus RT-AC68U router?

I have two other routers (RT-AC57U) connected to my main router via 30m ethernet cables, and set up as access points. Everything works perfectly - I can connect via wifi to any of the routers, and ...
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When DHCPv6 is used in a home network what is the initial Identity Association requested by hosts?

Lets assume the M-Flag of a NDP Router Advertisment Message is set so that DHCPv6 is used for address assigment and Stateless Address Autoconfiguration was used to create a link-local address for the ...
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What is the initial source address used by a DHCPv6 client when DHCP is used for address assignment?

When DHCPv6 is used for address assigment (determined by the M-Flag of a NDP Router Advertisment Message) the host obviously does not have a valid link-local address yet. For Stateless Address ...

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