Questions tagged [dhcp-server]

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

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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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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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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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1answer
132 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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Installing Windows Server 2012 R2 on top of Windows Server 2008 R2 with RAID 1 configuration

I have Dell PowerEdge Rack Server R510 that have Dell PERC S300 RAID Adapter which is configured to RAID 1. The server runs Windows Server 2008 R2. Currently the OS corrupted I cannot do backup ...
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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 set ip addres for wlan adapter using systemd?

I would like to set up my Ubuntu18.04 box for WiFi access point using hostapd. I could succeeded the goal if I manually set up wlan adapter, but I couldn't automatically bring it up when reboot. So I ...
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Syntax error in vboxmanage while giving netname

I want to create an internal network in my virtual box for the VMs to connect to each other. The problem I am facing is when trying to create a dhcpserver with the command sudo VBoxManage ...
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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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724 views

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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504 views

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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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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1answer
49 views

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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1answer
52 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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305 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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263 views

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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100 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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1answer
39 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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66 views

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 ...
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Can the DHCP relay agent use the DHCP offer IP's subnet to shrink switch flood domain?

I was wondering whether once the DHCP offer made by the DHCP server arrives at the DHCP relay agent, the relay agent is able to (assuming the network has one VLAN per subnet): examine the DHCP ...
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1answer
96 views

Default gateway has the same IP as the DHCP Server

Just out of curiosity, Is it normal for a default gateway to have the same IP as the DHCP server? I am running windows server with no roles installed, My IPs are dynamically allocated by the DHCP ...
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1answer
1k views

What is preventing a DHCP client from getting the default gateway route?

Raspberry PI is connect to OpenVPN server via TAP connection. PI's tap is bridged with the PI's ethernet interface. When the the client in question connects to the pi's ethernet port, isc-dhcp-server ...
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174 views

Router for RA, Linux for DHCPv6

I have a Mikrotik router. It has a DHCPv6 server, but it only gives out PD with it, it doesn't give out stateful addresses. I'd like to configure a Raspberry Pi (Debian) box for just the missing piece....
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Struggling with WDS and UEFI/BIOS Bootissue

Scenario: We have following setup. Windows 2008 R2 - Active Directory Server with DHCP/DNS Roles (SRV01) Windows 2016 x64 STD GUI - WSUS (SRV02) for deployment of windows updates to clients Windows ...
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1answer
580 views

Installed DHCP Server but I cannot add a new scope

I have added the DHCP Server role to my Server 2016 server. Once installed I open the DHCP utility and expand my domain which lists IPv4 and IPv6 When I right click on IPv4 to set a scope the "New ...
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Doubts about deployment of wpad

I mounted a server (in ubuntu) and I'm going to deploy wpad for autoconfiguration of the proxy on the computers. I have performed the following procedure: I have created 3 files, because I read ...
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2answers
1k views

Server 2016 DHCP vs Router DHCP or Both

I'm running Server 2016 in a home environment and until recently installing Active Directory (I did not install DHCP server) to the server my router has been my DHCP server. Now that I have installed ...
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1answer
83 views

dhclient with '-s <server-ip>' flag

I want to understand under which circumstance this command is valid. As i can see, using this command the discover packets have unicast destination ip same as that of the provided server ip while the ...
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1answer
668 views

Stateless IP being assigned instead of DHCP address

Here is the information: Host link IP: fe80::9eec:b32d:855c:5589 Server link IP: fe80::f03c:91ff:fe11:96c4 Host global IP: 2601:aaaa:bbbb:cccc:1854:46d6:c2f9:e727 (Ugh!) Server global IP: 2601:aaaa:...
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Would like to use CentOS in VMware as a DHCP server for other virtual machines

I'm using three VMs: one is CentOS, while the others are Kali and Ubuntu. I would like to use the CentOS one as the DHCP server and others as the host. Even though they can ping between each other, ...
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116 views

serving multiple networks with one single DHCPv6 server

I have an ISC DHCPv6 server running on a debian (Stretch) machine and 3 physical networks : net1, net2 & net3 . The router is a Debian machine running the Zebra routing software (See picture below)...
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virtualbox, host-only network, dhcp ack, router missing

I'm using a VirtualBox VM with a host-only adapter. On the host-OS I have enabled IPv4 forwarding and configured iptables' FORWARD chain to allow outgoing NEW connections from vboxnet0 to wlan0 and ...
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dhcp wi-fi server on raspberry with hostapd without dns forwarding

I want to use a raspberry pi as a wi-fi server in the following situation: A laser scanner sensor is connected to it by ethernet, and a service running on the pi should transfer the data to a pair of ...
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1answer
2k views

missing default route from dhcp while installing linux in a subnet

I tried to install Debian on a PC but I don't get a default route and can't access to internet. It says: The network autoconfiguration was successful. However, no default route was set: the ...
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1answer
3k views

How to give a DHCP server priority over another server

We have a router that is also functioning as a DHCP server. However, it does not offer much configuration and so as a result it always offers IPv6 as well as IPv4 DNS servers, which breaks some ...
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1answer
337 views

isc-dhcpd-server - correct subnet and netmask setting but assigned IP and netmask (ifconfig) different

A colleague of mine is currently trying to fix an issue with a Raspberry Pi 3 machine (latest Rasbian). The isc-dhcpd-server runs without any issues on another similar setup. Inside the /etc/dhcp/...
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1answer
150 views

what does subnet 163 specify?

I just got a new router. It has the following fields filled in (under the DHCP Server section): Range: 192.168 Subnet: 163 Start: 100 End: 250 What IP range does this specify? Thanks
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1answer
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Intermittent failure of IP address provision after moving to new AP router area on same network

I have a modem/router connected via PowerLine Ethernet to 3 different routers working as AP devices across our home. Occasionally (and especially when walking between different AP areas) the new, ...