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Questions tagged [dhcp-server]

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

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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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27 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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39 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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113 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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53 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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209 views

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
70 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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59 views

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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1answer
75 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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8 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
413 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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56 views

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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59 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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118 views

How to get /64 as prefix length when using DHCPv6 and radvd?

For our networking course we were asked to set up a DHCPv6 server in a virtual machine. I choose to work on a virtual machine(on VMware) running Ubuntu Desktop 16.04 and Lubuntu 14.04 as test client ...
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171 views

loop to block dhcp ports with iptables, except traffic between my server and my clients

I want to block dhcp traffic on my local network with iptables. Example: iptables -t mangle -A PREROUTING -p udp -m multiport --dports 67,68 -j DROP iptables -A INPUT -p udp -m multiport --dports ...
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120 views

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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66 views

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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229 views

Dhcp server on windows 2008r2 gives this error: “unable to determine the dhcp server version”

I have two dhcp server on my lan and each of them is running on a dc (windows 2008r2). i'd like to manage both of the dhcp server from the command line with the netsh command by domain\administrator ...
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84 views

Odd routes created on raspberry pi running OSMC, dhcpd, pi-hole

When running a combination of osmc, isc dhcp server and pi-hole on the same Raspberry Pi I've run into a strange problem with routes created that I cannot remove. The raspberry Pi is the DHCP server ...
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419 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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782 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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41 views

Control Internet Sharing DHCP with OSX Server

How can I control the Internet Sharing DHCP with the OSX Server App? When I go to the config page it looks greyed out like in the following image:
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1answer
165 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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76 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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28 views

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, ...
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89 views

How to map assigned IP addresses to MAC addresses in Windows 10 ICS?

With Internet Connection Sharing enabled, Windows 10 assigns random IP addresses to clients. How to setup MAC address to IP address mapping so each client always gets the same IP address (as long as ...
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27 views

Installing dhcp-server on Ubuntu

I am have trouble installing dhcp-server on Ubuntu 16.04. I entered "sudo apt-get install isc-dhcp-server" in terminal. Installation starts and ask for response 'Do you want to continue? [Y/n]' ...
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2answers
327 views

Roommates have several IP addresses on LAN : how and how to stay at one?

We have a not so bad connection at home, but we have some huge lag spikes. We have a terrible upload rate (around 0,95MBps at peak performance) and as soon as there's too many people on the network, ...
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204 views

Setting up an external DHCP server causes Huawei B310 to stop responding

I have moved houses, and thereby internet providers. Choosing a 4G connection rather than a landline, I bought a Huawei B310 for my home network. My LAN is unusual in that I run my own DHCP and DNS in ...
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363 views

Using an old router as switch and access point

I have an old router that I would like to repurpose as a switch and as a access point. I did the following steps according to guides I've found online: My home networks router IP is 10.0.0.138 And ...
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147 views

Can i have two DHCP wifi router for one LAN

I have 9(nine) tp-link tl-mr3420 router in one LAN with one WAN IP address. Can I configure two of them as a DHCP server for one LAN?
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47 views

How to connect routers in lan-to-lan and debug DHCP problems?

I'm helping a friend to set up a second router, but we ran in some strange problem. Here is the topology of the network and related information. What did we do: connected one of R2 LAN port to one of ...
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3k views

How can i configure and enable DHCP Server inside the VirtualBox?

I've installed debian 9.0 inside the virtualbox. I want to disable VirtualBox's DHCP Server and configure this debian image as DHCP-Server, so that other images inside the virtualbox can get their ip ...
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1answer
236 views

DHCP server of Class B Network

As far as I know, normally a DHCP server of Class C Network, which is able to serve for 256 clients in total only. Do you guys have any idea about DHCP server of Class B Network? Customer asked if it ...
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354 views

Make Windows Server 2012 R2 override router DHCP

I'm looking for a solution for a home server that is not live all the time. I'm playing around with AD/DNS/DHCP. Only problem is that when I want to use my server DHCP service that I'm required to ...
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298 views

udhcpd instance reports address already in use

I am attempting to setup a dhcp server, using udhcpd as the dhcp server. Background info: Following a tutorials for configuring a dhcp server (for Raspberry Pi AP's e.g. here and here and here), I ...
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124 views

Make Dynamic IP from ISP like Static [duplicate]

As the title says, is it possible to have a dynamic IP from an ISP and make it renew when the lease is up to the same IP? I ask because I would like to run a Home-Page and a VPN + FTP service on the ...
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1answer
489 views

Almosy locked out of PfSense after setting static ARP table

So I almost locked out myself from pfsense after setting static ARP table in the dhcp severs's conf. Now, I can't access pfsense from the network (nor ssh, nor webgui) because every request times out....
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794 views

Booting UEFI PC from WDS - can someone explain me in details?

We have Windows 2016 Server with WDS role. We want to make this WDS to boot UEFI-only (or with legacy boot disabled) devices to deploy Windows 10 x64 with MDT. Our DHCP service reside on hardware ...
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153 views

Configure two DHCP relay agent in same Vlan

Based on a recent issue I encountered, I'm raising the question. Say you have a VLAN that spans between a few switches, but there are two VLAN IP interfaces at two different places in the same area, ...
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1answer
449 views

DHCP Asking A Server For The Hostname Of An IP Lease

I am trying to understand what data is actually stored on a DHCP server. I understand the process of how a client gets a lease for an IP address from a server, but is it possible to poll a server for ...
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0answers
29 views

Different IP series for Wireless Clients

We have following simple setup ... Active Directory (2008) Server, IP address 10.0.0.1/8 with DHCP server configured. Users gets ip from this DHCP , pool 10.0.0.2-10.0.0.255 (/8) Data ...
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1answer
7k views

Enable dhcp server in Win7 for LAN

This is setup, Custom Board <---LAN---> Laptop[Win7] <---Wifi---> Router I am implementing dhcp client on custom board, i am not able to receive any dhcp offer after sending dhcp discover to ...
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268 views

Setting up my DHCP server, I am confused with the IP range

I am currently setting up my DHCP server, but I don't know what must the IP range be. And I keep getting this error:
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2answers
2k views

D-Link DGS-1210 DHCP Relay Option 82

I'm having problems with DHCP relay (option 82) on a DGS-1210-10 switch. The configuration is: Port 1-8 is untagged VLAN 80 (this is also PVID) Port 9 and 10 are tagged VLAN 80 and 99 (where 99 is my ...
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1answer
137 views

My Own WiFi Router + DHCP Server on a Public Wifi

I live in the dorms of my University, that has a public WiFi for each building. I have several computers in my apt (+ a RPI, a Chromecast Audio, and a WiFi printer) which I want to connect to my own ...
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1answer
876 views

How to force Host-Only adapter to retrieve an IP from the VirtualBox DHCP server

I have a Linux RHEL guest running on a VirtualBox VM, the host machine OS is Windows 7. I'm trying to link both by a Host-Only network, but I can't reach one machine from another, and I guess that ...
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1answer
714 views

Can I block certain MAC addresses from a cyberoam firewalls DHCP server?

Is there a way to "tell" cyberoams DHCP server not to serve specific MAC addresses? for instance if it sees a DHCP request from aa:bb:cc:dd:ee:ff it should not reply to that request but it should ...
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1answer
101 views

Short DHCP lease from ISP, causing problems with built-in NIC but not with pci NIC

ISP default lease is for 15 minutes. When this happens, built-in NIC release IP and gets 169.x.x.x address and then immediately renews the IP from DCHP which will be the same IP as before (all happens ...