Questions tagged [dhcp-server]

Dynamic Host Configuration Protocol (DHCP)

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Can't get dhcp configuration

This is the network I need to implement. G is dhcp server. I'm trying to get configuration for C3, but it can't find dhcp server. Tried from C1 and it worked.Dhcp configuration. Dhcp relay ...
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Windows 2012DHCP Scope on a /8

I inherited a mess. Let's say there is a site in the network setup as 10.0.0.0/8 with a DHCP pool range of 10.100.100.1-254, a subnet of 255.0.0.0 and 10.199.199.1 is the DefGw. All of the IPs ...
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Freeradius with dhcp server: Calls to perl module returns error

This is a continuation of my previous question in sending static routes from Freeradius DHCP server implementation in combination with Strongswan VPN server. When debugging Freeradius using tcpdump ...
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Dhcp server dont access internet

I have 2 ethernet cards in Ubuntu Server 20.04; enp1s0 my main ethernet card, enp2s0 my dhcp server ethernet card. I want devices that receive ip via enp2s0 to access the internet, but if I set the ...
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Migrating DHCP clients to new subnet using DHCP superscope?

I am migrating our dynamically addressed DHCP clients to a new subnet due to requirements coming from the higher ups. I am thinking of doing it like so: 1. Create new scope on DHCP server (Server 2019 ...
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isc-dhcp-server ip-range speicifc domain-name-server

I'm trying to get an isc-dhcp-server configuration to use different DNS-Servers based on the ip-address assigned. Basically, I want some of my client marked as not-trusted, which then may not access ...
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Migrating Old Active directory Forest with two domains

We have single AD forest with two domains as follows: Domain A: Contains nearly 30 servers (7 physicals and 23 VMs) all hosted on Microsoft Hyper-V server Nearly 500 Active user accounts A huge file ...
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Obtaining two DHCP addresses on Linux

There have been various questions asked a long time ago about obtaining two IP addresses via DHCP on Linux. Most of those are still relating to old 'alias interfaces', like eth0:0, which has been ...
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ScreenOS SSG-320M Source Interface Based Routing

quick question. Couldn't figure this out with even the ScreenOS Bible. Juniper SSG-320M Firewall, Just added an 8port PIM Module(ETH1/0 to 1/7): ETH0/0(Trust) 172.16.1.1/16 ETH0/2(UnTrust) 192.168.0.5/...
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Ubuntu 20.04 false subnet per interface isc-dhcp-server

This morning I have configure my interfaces network: version: 2 renderer: networkd ethernets: ens160: dhcpd4: true nameservers: addresses: [8.8.8.8,...
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Implementing rfc3442 (classless static route) in Freeradius DHCP server

I am trying to setup a Strongswan server that runs in split tunnel mode, which means I have to disable using the server as a default gateway on client side and also disable classfull routing in the ...
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DHCP server IP reservation during the "offer" step

How long the IP is reserved by the DHCP server when it sends the offer message. Image the client does not send back the request message, after how much time the IP is again available? Thanks for your ...
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dnsmasq as dhcp server using wrong src ip

I'm running dnsmasq as a DHCP server on an interface that has multiple IP addresses. The problem is that dnsmasq is not using its server IP (10.13.7.33) as the src IP in its replies but instead ...
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DHCP Kea High Availability over TLS doesn't work

I have installed 2 Kea 2.0.1 Servers in Debian 10 Buster virtual machine in Virtual Box 6.1.26 r145957 (Qt5.6.2) and also in VMware Workstation Player 16.1.2 build-17966106.The high availability ...
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DNSMASQ DHCP with Multiple VLANS --- How to identify the originating VLAN?

I'm curious as to what best practice would be when serving DHCP to multiple VLANs from a single DNSMASQ instance. (The DNSMASQ server is a KVM guest.) Do I: A: Create a virtual NIC on the DNSMASQ ...
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Our cable modem is acting as a rogue DHCP server, even though its DHCP function is supposedly disabled [closed]

We have, for quite some time, had problems with systems on our LAN coming up "bottled," i.e., with non-functional connections. I recently noticed that the assigned IP addresses looked like ...
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Using DHCP reservations instead of static IP address configuration for servers

I was wondering if it is better to use DHCP reservations for servers and computers that must have static IP address, excluding DHCP servers themselves, Domain Controllers, and DNS servers of course, ...
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static bindings in DHCP server

I'd like to enable static binding in the DHCP server (I'm using KEA Dhcp https://www.isc.org/kea) but I think it is applicable to other implementations as well. What exactly I want to achieve is to ...
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dnsmasq DHCP not working, not replying to DHCP requests

I have setup dnsmasq as DHCP server on a CentOS VM, however it is not replying to DHCP requests. What could be the issue? Following is the configuration and tcpdump logs. interface=ens224 listen-...
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Can't start isc-dhcp-server due to error " AgentInitCheck: agent comms failure"

I have a Raspberry Pi 4 - Model B, and I'm trying to create an adapter from Wi-Fi to Ethernet using the Pi. I'm currently using this gist as a guide for how to create it, but I keep running into an ...
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ISC DHCP/DDNS setup: Static entries for non-dhcp clients

I have set up a local network with ISC BIND9 and DHCP service. New leases trigger the DHCP to add an A and PTR record which works perfectly. I also added lots of static host entries in the dhcpd.conf. ...
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Identifying current main DHCP server

There are two DHCP server of the same IP address example.(10.100.9.12 and 10.100.9.13). The gateway, subnet mask, and DNS is the same. The current DHCP are running on Vlan9. Is there any possible way ...
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How can we add multiple pool in wide-dhcp6s server configuration file

I am using wide-dhcp6s as dhcpv6 server in my linux pc, i am trying to add 2 pools but only one pool is working. my configuration is shown below. interface bdg3 { allow rapid-commit; address-pool ...
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Windows DHCP not showing the accurate leases

In Windows System Event log, there are DHCP server warnings that IP address range of a scope (10.40.0.0) that available is low. Windows Event Log But in the DHCP program, the Address Leases is only ...
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DHCP NTP Server Option 042 not propagated by Windows Server 2016

I am trying to make NTP server settings available to our non-Microsoft devices on local wired and wireless network. Obviously, they don't know how to use MS AD time info from domain controller. Our ...
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Problems with WDS on different subnets

I'm setting up a WDS (Windows Deployment Service), the WDS server is in a different subnet than the clients that need PXE. These subnets are connected through a VPN tunnel. Routers are pfsense. But on ...
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Windows Server RAS with diffrent subnet for more adresses

we got simple setup with Windows Server and RAS/DHCP/DNS on the same server. Now we got the problem through covid we ran out of ip adresses on the default subnet. The main server is currently on 10.10....
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DHCPv6 with ISC

I am building a network and I got stuck while setting up the DHCPv6 Server with isc. I was looking in internet for any documentations, but wasn't able to find anything. I created 2 test vlans - Vlan5 ...
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Parsing dhcp-parameter-request-list

I am actually trying to parse the dhcp-parameter-request-list and see if it contains option 143 in the list. If it contains 143 option, then I have to respond with a 143 message with bootstrap server ...
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isc dhcp multiple option 240 in same subnet

I'm fairly new to isc dhcp. I'm working at an ISP and need to provide our STB's with an option 240, and it has worked fine for years, the problem now is that we are getting a newer model, that needs a ...
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Query IP/hostnames in local network (Windows)

I have a Windows Server based network, running a Windows DHCP and DNS server. How can I list all the computers in the local network known to the server? That would mean querying either the DHCP or the ...
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Going to implement new Infrastructure in HQ Office with 1 firewall, 1 L3 Switch, 5 L2 Switch, 2 Managed WIFI AP and 1 Server [closed]

Im going Implement Network in HQ Office which will link also with Branches Office. What IP Address Class is recommended on this scenario? Need some assist to Kick Off on this. I have 1 unit Fortigate ...
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How does a client find the DHCP server on network if DHCP is disabled on the router? [closed]

I am an acting, self-taught network administrator, so please excuse me if this should be obvious. I have a Windows network with domain controllers running DHCP. My gateway/router is a Meraki MX67 that ...
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What is default IPv6 configuration on routers

I've just started learning IPv6. I have a router running OpenWrt and I would like to configure it to use IPv6. As I know this address can be assigning to a client with or without DHCPv6 server. Do you ...
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DHCP Pools on Ubuntu DHCP server not working properly

Mac addresses ending with "55:a3" and "56:2a" are also ending up in last pool 123 match if binary-to-ascii(16,8,":",substring(hardware, 5, 6)) = "55:a3"; ...
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dhcpd server invalid mac detection

On my dhcp configuration, i have on commit hook to save device information. My problem is some of the mac addresses becomes invalid: 8:7c:39:cf:b6:3f - this should start with zero 8:d0:b7:52:f9:68 - ...
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The specified package is not valid Windows package. Error: 0x800f0805

I installed Windows Server 2016 on VirtualBox, and now I am trying to install DHCP server on my Windows Server 2016 machine, but I got an error. I set this machine as a Domain Controller before, so I ...
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Is it possible to force the DHCP server to assign a different IP address each time the address is renewed?

I need to detect IP address renewals in my C++ Linux application and check if the new address is different from the old one. I have access to a router running OpenWrt. I can change the lease time, but ...
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DHCP Server received Discover mesage but not responding with Offer mesage

I using DHCP (windows server 2019 standard) for multiple scopes witch DHCP relay is Cisco 3750 L3 switch. For the first time, it's working normally but after about 8 hours the DHCP server received ...
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Can I have two DHCP servers for IPv4/IPv6?

I have an IPv6 block, However the network is based on an IPv4 only router. I can't change that router for several reasons. Can I have a DHCPv6 server with DHCPv4 server? Or do I have to disable DHCPv4 ...
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Mikrotik: HowTo pre-define static leases in DCHP-server

I would like to replace my current router by a Mikrotik (v6.48.3). In order not to mess up my network, I would like to pre-set the IP addresses the DHCP clients will get from the server. I do not find ...
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Refreshing Windows DHCP Server reservation active/inactive state

I have a Windows DHCP server with a number of reservations. These all seem to work correctly (in that the addresses are correctly distributed) but, somehow, the Active/Inactive state of these has ...
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What is the exact meaning of "On Commit" in ISC DHCP server configuration?

I know there are three kinds of events we can use for scripting in ISC dhcpd -- commit, expire and lease. My problem is, I am having a little problem in understanding the "commit" event. I ...
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What DHCP option tags are used by standards but not recorded?

I've been working on setting up an in-house service that uses DHCP to let clients auto-discover the server's location. I took a look at IANA's BOOTP and DHCP option tags to see what's available to use,...
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Server DHCPv6 with Linux Alpine

I want create a server dhcp6 with alpine I'm using Kea-dhcp6. The my file config this is: { # DHCPv6 configuration starts on the next line "Dhcp6": { # First we set up global values &...
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netplan - Network with DHCP configured, but no internet

I am trying to configure my Ubuntu Server 20.04 LTS to use DHCP in its network configuration. Many tutorials on the internet recommend that I create the following file with the following settings... ...
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Unable to add forward map SERVFAIL/REFUSED DDNS

I am using bind9 on a primary dns server with two secondary dns servers in a master/slave relationship. I am attempting to implement DDNS but seem to be running into a problem when it comes to adding ...
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Block the DHCP server from broadcasting into the second ethernet interface

I have setup my DHCP server by following the instructions in https://wiki.debian.org/DHCP_Server. This all works but the issue I am having is the DHCP server is being broadcast in the main company ...
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Dhcp reserved addresses

Is it better to use a dhcp server to reserve addresses based on mac address or to assign them statically on the interfaces? I have a small network and i want almost everything to have static ip ...
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Hosting Azure Active Directory and retiring on-prem AD

Background:- We have Office 365 licenses and all employees have their individual mailboxes. Currently there is one Domain Controller, which not only hosts Active directory but also acts as DNS and ...
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