Questions tagged [dhcp-server]

A DHCP server is a program to hand out Dynamic Host Configuration Protocol leases.

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Cannot receive IP from router bridge

I have a "router" that is basically a computer with 4 network ports and Linux Centos installed that I will be calling Centos-Router from now on. My operator cable router is configured with ...
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configure DHCP server service on fedora

I have installed DHCP on fedora using yum. I need to configure the DHCP server service for the 192.168.26.0 network. Using a DHCP range of 192.168.26.50 – 192.168.26.100 What commands can help me do ...
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DHCP server configuration for LAG client

I have a NAS server (Linux based) connected to my lan. The NAS has two redundant LAN cards configured using LAG (dynamic link aggregation 802.3ad). I want to create an address reservation using my ...
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Is there a way to know what public ip addresses my pc had last months or year?

Is there a way to know what public ip addresses my pc had last months or year ? Are they saved somewhere ? Thanks in advance
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DHCP Options in VMware Fusion

I tried to get my DHCP server on vmnet2 to include an option for a particular host, so I added this configuration below the "DO NOT MODIFY SECTION" block in the relevant config file (/...
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No able to send required option(i.e. option 16) in dhcpv6 using client dhclient in Linux

I need to configure dhclient to send option 16 in solicit message. I have updated dhclient.conf file as follows send dhcp6.vendor-opts 00:10:00:0E:00:00:01:37:00:08; request dhcp6.fqdn, dhcp6.name-...
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router is assigning a different private ip address for my intranet

I have a rog ag11000 router setup as the main router, and also have a DDWrt linksys router connected to it via lan cable and configured to work as an extender (DHCP server off). The gateway ip address ...
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Can a DHCP Client tell the DHCP Server not to hand him a specific IP address?

I have a device that has two ports and one always requires static IP address "X". The other port can be connected to a LAN for internet access. Is it possible that when that port is ...
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Can I configure my Windows 10 PC as a DHCP server on a local switch?

I'm creating a local network that I would like to have DHCP capability. I have a primary Windows 10 PC that will be on the local network full time. Is it possible to configure this PC as a DHCP server ...
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309 views

Multiple interfaces match the same subnet - how to fix this?

I have a raspberry pi 2 with a lan interface (eth0) and wan interface (wlan0)- usb wifi adapter. My OS is raspbian. I want to use my raspberry as a wifi AP. So, it is necessary to have a ics-dhcp-...
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Configuring DHCP for Windows 10 Network Installations

While following a tutorial for PXE booting a Windows 10 Installation Media, the requirements mention using a DHCP server to do what seems to me to be intercept the DHCP broadcast and instead assign ...
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How can I reserve a static IP address for my PC on a TPLINK Wireless N ADSL2+ Modem Router?

I am trying to add a static IP address for my PC. I have tried to search on Google, and I got on this page on TP-LINK official website. Unfortunately, the screenshots in the article shows a very ...
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Does a DHCP server really check for conflicts using “ping”?

I read the following excerpt in a CCNA prep book and it doesn't sit well with me: So during IP address assignment, a DHCP server checks for conflicts using the Ping program to test the availability ...
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Is it possible to integrate stand alone Windows (10) clients into an (RedHat) IPA enviroment?

I am planning to migrate my local LAN to RedHat IPA (DHCP, DNS, user management). The IPA server is an replacement for the Windows Domain Controller (AD). Most of the clients are booting Linux. ...
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How should a dhcp server allocate only one ip address?

How should I configure the dhcpd.conf file so the DHCP server would allocate only one IP address from a subnet to the first VM that is connecting to the DHCP server? Thank you. Operating system: ...
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how to setup IPv6 ULA advertisement and -DHCPv6 in home network?

I am on ArchLinux, and I am running IPv6 in my local home network. IPv6-Internet comes with my fritz.box and works well with all clients. On my home server, I set up radvd to advertise my local ULA ...
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DHCP packets cut off after configuring VLANs on switch

I initially set up my switch taking inputs from my router, modem, and all network devices... and quickly found that was a bad idea when I tested DHCP results and found I was getting responses from the ...
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Netplan/DHCP Config: Forwarding requests from one bridge port to another

im trying to configure a bridge network on Ubuntu 20.04. There are 4 ethernet ports in the brige. This is how the corresponding netplan config looks like: network: version: 2 ethernets: ...
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Can dnsmasq allocate IPs defined in /etc/hosts

I have a pair of Raspberry Pi Zero W connecting to each other through WiFi. They have their hostnames configured as "server.example.com" and "client.example.com". I run hostapd and ...
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Cannot connect to local server when internet drop down

we cannot connect to local server or database when internet is down, we have server (OS: WINSERV2012R2) running DHCP. Server IP: 192.168.1.30 Router IP: 192.168.1.1 The Router and the server are ...
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Configuring ASUS Router to use custom Bind9 and DHCPd on LAN

Let’s say I have a Raspberry Pi set up to be a client on the network and I want it to use 192.168.2.2 while the router uses 192.168.2.1, what’s the necessary router configuration to use the Pi’s dhcpd ...
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Some devices not getting IP from DHCP after adding bridge to server for VMs

I have a server that serves my office and home. For office work I have just added some VMs (one for MySQL and one for WWW and PHP). The server has isc-dhcp-server providing IPs for most devices on the ...
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DHCP issues with two wireless APs and two different SSIDs on the same network

I have a small home network with a pfSense router running DHCP and DNS, as well as other services. This is directly connected to the internet via a modem, and then the other side connects to a switch. ...
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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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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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Can a computer running a DHCP server assign its own IP address?

Can a computer running a DHCP server assign its own IP address, or does it have to be set statically? If this is a question which depends on the DHCP software, then my configuration is a Debian server ...
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isc dhcp server static address allocation

I have a server with several network interfaces that are combined in bridge, because all clients should be in same subnet. How should I configure isc-dhcp-server to lease static ip addres to each ...
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444 views

Turn old laptop into a router (dhcp and vpn)?

I need advise as to whether what I'm trying to do is possible or not. I have a spare laptop and plan to make the most of it by setting it up as my router. Basically connect my modem directly to this ...
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How can I use a separate DHCP server and have it go through 2 routers in Cisco Packet Tracer?

I am currently using Cisco Packet Tracer to simulate a network. Currently I've got this setup: PT DHCP Agent For some reason I'm not able to get the DHCP server to return an answer to PC1 even ...
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dhcpd service restart takes almost 7 minutes in CentOS7

I have 110 dhcp scopes in my config file. Everytime I restart the service, it will take it almost 7 minutes to complete. More info below: [root@dhcp ~]# [root@dhcp ~]# grep VLAN /etc/dhcp/dhcpd.conf |...
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Arch Linux Install Cannot Enable dhcpcd

I am having problems using dhcpcd. I try running systemctl enable dhcpcd@enp0s31f6 Returns Unit file dhcpcd@enp0s31f6.service does not exist. When I try running ip address, it outputs 3 options lo &...
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Steps into trouble shooting DHCP on Windows

We are trying to setup a DHCP Server Client to listen to requests on a specific Ethernet line. We had IT open the firewall ports for the port 67, and 68. Then using a DHCP Client we've successfully ...
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How can I find the DHCP server address in Ubuntu 18.04?

I need to know the DHCP server IP address. How can I find the DHCP server address in the network from my Ubuntu 18.04 device?
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How to configure a Linux DHCP server when behing a DHCP relay?

Considere the following: How can I configure my DHCP server (isc-dhcp-server package on ubuntu) to feed addresses for 172.16.0.0/18 subnet as it does not has any interface in that subnet? I tried to ...
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Ubuntu DHCPD won't start

I upgraded today to Ubuntu 16.04, I know it's a long overdue upgrade. After the upgrade finished the ISC DHCP server stopped running. It appears to be a permissions problem but I'm darned if I can ...
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DHCP discover not being answered through repeater

I am currently stuck with a fairly crappy router/modem combo from a German ISP. In order to get good WiFi signal in all rooms, I have installed a second access point, using an old router in bridge ...
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isc-dhcp-server not 'listening;

I have got isc-dhcp-server set up on my Raspberry Pi (acting as a router), but when a client attempts a request, the Raspberry Pi does not pick it up. However, when I run: nmap --script broadcast-...
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253 views

How to determine in a shell script whether DHCP is running or not

If I am running a shell script in linux environment, is there a way to determine whether DHCP is running or not? Something like below is what I wish to do in pseudocode terms: #!/bin/sh if [DHCP is ...
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Two PCs with own routers on the same LAN

I want to put an additional Windows 10 PCs, with its own broadband service provider, on the same Ethernet LAN as others that already have a different broadband service provider. Are there likely to ...
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522 views

Internet via ethernet, switch and another pc wifi

I have two pc. One has Internet via WiFi and the other one has not the WiFi board, only ethernet. If I install a dhcp server in the one with the WiFi and then connect both to a switch, would I be ...
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Ubuntu: dhcp server on NIC with 2 (or more) ip address

On Ubuntu 18.04, I have my eth1 configured with 2 static ip: $ ip addr show eth1 8: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000 link/...
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How does DHCP server knows what router interface is the gateway for each different scope

If I have a DHCP server as on the Network Diagram graphic above on the broadcast domain of the fa0/1 and I create three scopes for example: name: "scope_fa01" range: from 192.168.1.1 to 192.168.1....
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How to configure DHCP with multiple NICs in one subnet?

I want my linux server act as a router. There are four ethernet ports (eth0, eth1,eth2,eth3) on the server and one wireless card (wlan0). eth0 is the gateway (WAN), eth1-3 are LAN ports. How to ...
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How to “forward” dns ip addresses one level deeper?

I have a mobo with 2 ports: eth0(WAN) and eth1(LAN) which i want to use as a router/gateway(NAT). But at first I want it to manage DHCP. I've installed Debian, configured eth0 for dynamic and eth1 ...
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587 views

Can isc-dhcp-server and dnsmasq coexist?

After two days of trying to configure dhcp on dnsmasq and failing, I'd like to go back to isc-dhcp-server, and only keep dnsmasq for dns. Can the two coexist well? is there anything I need to pay ...
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How to setup ipv6 network from Hurricane Electric with fixed address delegation?

Please help with setting up ipv6 network on linux gate. I want to give clients a static ipv6 address from the HE routed 2001:471:70c8::/48 pool. I took the first /64 subnet (2001:471:70c8:1::/64) from ...
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143 views

Rasperry Pi as a WiFi Router, but without using Ethernet cables?

I have the Raspberry Pi 2, and the official WiFi dongle that comes from the makers of Pi. I'd like to mention that I'm very new to understanding technology, code, and how things work in general so I ...
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61 views

Add multiple static IP's for a client in ISC dhcpd4

Currently I'm migrating the network from static IP addresses client-side to a static IP pool in a central DHCP server. Some of my clients have multiple network interfaces, which I'd each like to ...
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DHCP relay agents

So the relay agent appears to have an internal IP that is part of the subnet. The relay agent is also on the router. I think it can also be on the switch, which would support my theory that the DHCP ...