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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What is the best practice for assigning static IP addresses? [closed]

In my scenario, I would be assigning IP addresses to security cameras. I am wondering if I should assign a static IP address from the device itself, or have a static entry on my DHCP server with their ...
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How to configure dhcpcd to work with default dns?

I have an embedded Linux device which connects to wifi. It is configured with DHCP and configured to use a specific DNS server. The current configuration works. However, I want to remove the DNS ...
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Incorrect MAC address on DHCP

Recently I experienced an issue: A Label Printer shows up as offline and users cannot print from it. The MAC address of the printer was given to someone who reserved a DHCP lease for it. I restarted ...
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Connman Force DHCP Renew

What is the suggested way to force DHCP renewal when using connman? Is systemctl restart connman the right way of doing it or is there any other approach? Thank you.
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My network setup do not work. FreeBSD

This question was asked by me on serverfault.com. It was closed as off-topic, with a suggestion to ask here, on superuser. The OS is FreeBSD 13.0. The setup that I need to establish is simple. In ...
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Openvpn fails running dhclient script

I have an OpenVPN setup running in bridge mode (tap). I have to run dhclient tap0 manually after connecting to vpn. I want to automate this, so I added those lines in my ovpn conf : script-security 2 ...
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How to change network connection to DHCP, as default user without administrator password?

I manage many remote Windows 7 and Windows 10 PCs that are logged on as standard users, where I log on to these via remote control program for necessary maintenance. The PCs are set up with a static ...
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If you restart your phone or router they looking for a new IP?

If you restart your phone or router,they automatically send a discover request to the dhcp server to get new ip? I'm a little confused,because when i removes from the outlet the router for 5 minutes,i ...
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Raspberry Pi Zero saying "No Wireless LAN Interface found"?

I am working with others and I need to connect the Raspberry Pi Zero to my WiFi then give it a static IP so that we can SSH into it. The others in the group have successfully done so. I started by ...
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How does ISP know when to change the dynamic IP?

As I understand, ISP uses DHCP protocol to give out IPs from some pool. Every time they give the IP via DHCP it has a lease time. At the end of a lease time, a router can receive the same IP - but it ...
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Integrate a stubborn ISP router into an existing Unifi network

I have a Unifi USG router, Unifi switch and Unifi access point. I have 2 internal networks, 192.168.1.0/24 and 192.168.3.0/24. I currently connect to the internet using an ADSL modem connected to the ...
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Debian Bullseye gets DHCP address instead of static after first boot

After a cold start, the NIC gets an IP-address from DHCP, not the static IP-adress that is defined in /etc/network/interfaces. After a warm boot, it gets the correct static IP-address. I have got a ...
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Setting DHCP on QNAP Openvpn

I have an openVPN on a QNAP server and all i want is to have the same ip address on the same pc on connect, but for only some - i want DHCP server with reserved IPs for specific MACs. I tried to set a ...
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5 answers
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I've turned off DHCP on my TP-LINK router and since then I cannot connect to it - is the router broken?? Windows 10

Since then I cannot connect to my router - maybe because I have "Obtain an IP address automatically" set up in my IPv4 Windows 10 settings selected. After I've turned my DHCP off and ...
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Is it possible to replace the DHCP and DNS functionality of your ISP router with a raspberry-pi/pi hole? (More specifically, does DHCP include DNS?)

I have a raspberry pi currently set up with Pi-Hole. Unfortunately, I cannot change the DNS settings on my ISP provided router (called a "Funbox 3.0"). It has a DNS tab with textboxes for &...
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How to consolidate local DNS from multiple routers and multiple DHCP servers?

I have a private network with several OpenWrt routers connecting some local subnets. I use NAT on a couple of the routers to give access to the internet via different providers. I run a local DNS ...
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Zyxel NAS326 not getting IP after powerloss

I bought a Zyxel NAS 326 and configured my router to a static IP. (192.168.0.110) After power loss, I can't connect to the NAS (the IP is not responding). Every time I need to disconnect physically ...
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Multiple switches connected to each other, manually assign IPs?

I have the following setup: Cable model from ISP -> Asus RT AC88U -> Netgear GS108Ev3 switch A -> Netgear GS108Ev3 switch B -> Netgear GS108Ev3 switch C. I would like to be able to assign ...
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How do I connect the VyOS router to the public IP of my bare metal dedicated server so I can reach the private web server on VMs?

I have a bare metal dedicated server with XCP-ng (open source version of Citrix Xenserver) hypervisor installed on it with a public IP (i.e. 50.55.60.65). I'm able to connect to the management ...
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2 answers
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Why do DHCP clients leave the port open after the lease now?

I've noticed on some embedded linux systems that both dhcpcd and systemd-networkd leave the DHCP client port 68 open after the lease has been acquired. The fact both systems do this indicates it's a ...
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How to change bios config from dhcp?

I'm looking for any way to get/edit the configuration of the BIOS like active or deactivate secure boot without going manually to the bios. The solution can be by using dhcp or other way. Any way to ...
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Notify router (DHCP) of static ip assignment

I have been working with the GUI Network Manager (Method 1 in the link below) for over a year on Ubuntu 20.04 to set static ip addresses for all Ubuntu devices. While this solution has been working ...
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DHCP+DNS combined

In my home network I'd like to setup both a DHCP and DNS server. I see that dnsmasq might be good, because it can do both. With dnsmasq I need to specify the IP<->hostname pairs in the /etc/...
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Replicate Domain Controller on Azure

In my company, we have a Domain controller on premise that hosts DHCP and DNS. We want to create a failover VM on Azure and replicate those servers. How to do this? I have read that Azure doesn't ...
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Setting DHCP Client Identifier for all interfaces in Windows 10

We currently have a use case where all interfaces need to have a custom client identifier for the dhcp server to be able to assign it correct IP Addresses. We have been using a registry based approach ...
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DHCPD v6 binding state is always active and never switch to expired

In my dhcpd6.leases file, all my IPv6 addresses given by my DHCPv6 server (isc-dhcpd-4.4.2) stay in binding state active forever. Even when I shutdown the client. In theory, the old leases should ...
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What exactly is router cascade option doing? [duplicate]

I'm trying to understand what exactly happens when routers are cascaded. All description I can find state that it is done when I want to connect router to router but I can do it without any setup. So ...
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No Internet through OPNsense (even though WAN is borderline Configured)

I am running opnsense and getting into the web interface. So far so good. I can't get through to setup WAN properly. I have a modem in bridge mode and a router behind that acts as dhcp. I setup WAN on ...
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Use systemd-networkd & dnsmasq to access other devices on LAN by hostname?

I've setup a router box at home via systemd-networkd config files, one external interface (wan), 2x 2 port nics that I bridged to act as the internal network. systemd is acting as dhcp server on that ...
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How to configure DHCPv6 in Proxmox without bridge [duplicate]

(crossposts: Network stack exchange, Server Fault) I have a setup with Proxmox connected via Wi-Fi. Everything works for my needs and IPv4 connectivity too. Now, I want to see if it is possible to do ...
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Cannot reach internet when connected directly to modem

I am currently attempting to diagnose bandwidth issues in my home network setup. I am seeing some strange throughput behavior and thus am trying to remove my WLAN router from the equation to try to ...
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ISC DHCPD: Dynamic IP Range for all Members of Class matched by Hardware Address

I have a DHCP server (Version: isc-dhcpd-4.3.5) running on Debian and managing multiple subnets, all running on virtual interfaces eth1:1, eth1:2, etc. over the same physical interface eth1. All ...
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How to exclude specific ip in wide-dhcp6s server

I am using wide-dhcp6s server in Linux based device.My problem is i want to exclude specific IP in dhcpv6 pool. My IPv6 pool ranges between 2001::1 to 2001::A i want to exclude IP address 2001::5 i ...
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How do you view DHCP servers within VirtualBox?

I set up a DHCP server within VirtualBox long ago and I wish to remove it. The VBoxManage dhcpserver does not have an option to list the servers -- only remove, add, or modify. I can't "tab" ...
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Make windows 10 use the dhcp6-address it have, not autogenerated

A window 10 machine gets its ipv6 address from dhcp6, and it also have an adress based on mac DHCP Enabled. . . . . . . . . . . : Yes Autoconfiguration Enabled . . . . : Yes IPv6 Address. . . ...
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Does My ONU Have Router Function?

I brought an ONU which has following functions: A DHCP server function, VLans optimization, LOID option, which used to get the ONU device authenticated by ISP. It has neither PPPoE/IPoE option, nor ...
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Internet Connection Sharing and remote DHCP issue on Windows 7

Due to temporary lack of external WiFi access point I have started using ICS to share internet connections to my mobile devices from my laptop. I know basics to configure it and what services must be ...
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PC connected over ethernet cabble cannot see Virtualbox Debian DHCP server

I am using a Debian OS on virtualbox. It has correctly configured DHCP, which works for any VM OS I run on internal network. When I switch to bridged, and select the Realtek PCIe FE adapter (ethernet) ...
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Severe ARP flooding from PC requesting link-local address

TLDR; PC is sending ARP Who is requests for a link local address 169.254.xxx.xxx continuously every second. Only on this device. My PC begins to send constant ARP requests to the router for "Who ...
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Wrong hostname resolution in Local network

context I was trying in vain to map drives from my NAS to my PC via NFS when I figured out that my PC hostname was not resolved with the proper IP address from my NAS or any other devices connected ...
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Make all net clients of a wifi router on a subnet have IP addresses in the form of clients of the parent router

i have an ADSL wifi Zyxel router connecter to outer internet and it serves IP addresses in the form of 10.0.0.x by DHCP - which is correct. Then i have a TP-Link wif router connected to Zyxel as a ...
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How to change a DHCP server

I am trying to tackle some simple hacking problems by creating two VM's. However, when writing the command to enable this function, I keep getting this error message. I have tried looking for ...
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Change adapter from static IP to DHCP

I want to change the interfaces of all computers of two AD OUs. Currently all interfaces have static IPs and DNS servers. I wrote this Powershell Script: $getIP = get-netipaddress | Where-Object ...
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How to deny DHCP broadcast by MAC address?

I live in an school dormitory where the network/internet is managed by the building. One day, some genius decided to plug their ethernet into their personal abandoned router's LAN port, or perhaps ...
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DHCP - "No working leases in persistent database - sleeping"

(I'm not a Super User regular, so please excuse me if I'm not asking this home-networking question in the right place - I picked here over Network Engineering or Server Fault based on this answer) I ...
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How to use VirtualBox's DHCP server for a pfSense guest machine so that other guest machine's within the internal network can connect to it

Clarification: My goal is to have pfSense set up using VirtualBox's DHCP server. This is so that it could be connected to the other guest machines on the internal network. Currently, all my other ...
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how to fix "Ethernet has no valid IP configuration" permanently

my main desktop computer has been losing connection overnight and taking 20 plus minutes of troubleshooting to return the connection. we're talking this happens every day for the last week to 2 weeks, ...
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2nd router won't connect to the internet/won't let devices connect

So i have two routers 1st router is my main router (Huawei HS8145C,ip is 192.168.100.1) which is connected to my ISP, then a 2nd router(Huawei hg8245h, i.p is 192.168.100.2) that i tried to become an ...
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Unable to contact DHCP on Windows 10, what to do?

I have just reinstalled Windows 10 on a Lenovo desktop but I cannot get the wired internet connection to work. I have it connected to a TP-Link TL-SG108 switch to which I have other machines connected ...
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How can I set up two sub networks that can communicate by LAN but where only one has internet?

I have two consumer ISP routers: Virgin Hub 3.0 (connected to the internet) and BT Smart Hub 2, connected to Virgin Hub 3.0 by Ethernet cable. I would like to set up a network where devices connected ...
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