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Questions tagged [dhcp-server]

Dynamic Host Configuration Protocol (DHCP)

The DHCP service is a client/server application that allows "clients" to obtain configuration information (typically for network settings) from a "server".

Questions carrying this tag should focus on the server-side more than the client-side.

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Linux DHCP server option 43 vendor-encapsulated-options, how to format/encode?

I admin the network for a small business which has an IPCop firewall box providing DHCP services to the network (and various other services). The DHCP server in IPCop appears to be dhcpd and IPCop provides a web-based front end to editing the…
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IPv6 address lifetime: preferred versus valid lease

What is the difference between "Preferred Life Time" and "Valid Life Time" lease. What is the point of preferred and why not just use valid life time lease? Thanks.
user1330287
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Why do I get "No subnet declaration" starting ISC DHCP server on subinterfaces?

I have created two subinterfaces on eth0 : eth0:0 with IP 192.168.10.1/24 eth0:1 with IP 192.168.11.1/24 Configured /etc/dhcp/dhcpd.conf like that: option domain-name-server 194.204.159.1; subnet 192.168.10.0 netmask 255.255.255.0 { option…
someHOW
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Assign fixed IP address via DHCP by DNS lookup

Preface I'm building a virtualization environment with Ubuntu 14.04 and LXC. I don't want to write my own template since the upgrade from 12.04 to 14.04 has shown that backwards compatibility is not guaranteed. Therefore I'm deploying my virtual…
Janos Pasztor
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DHCP Warning Sign Icon On Windows Server

I have a Windows Server 2008 R2 SP1 Domain Controller. I have the roles AD, DHCP, and DNS installed on this server. I noticed today that there was a warning sign on my IPv4 setting, but not on my IPv6 settings. Can someone please tell me what this…
nate
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Client not getting address from some DHCP server

I'm working on some embedded devices which should be connected to a large network (hundreds of devices) via ethernet and that should be configured using the DHCP protocol. What I'm experiencing is that apparently the devices get the address in some…
Luca Carlon
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Openwrt isc-dhcpd-4.2.4

Every time the dhcp service starts, it listens not only on 0.0.0.0:67 but also on 0.0.0.0:PORT where PORT is a random number. Anyone knows where this behaviour comes from? root@OpenWrt:/# netstat -ntapue Active Internet connections (servers and…
dash17291
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Is there a way to classify DHCP requests based on the interface they're coming from?

As the question title states, I want to classify my clients based on the interface their requests are coming from. Can this be done with normal matching? Or should I restrict the DHCP server to only one interface and have dhcrelay listening on the…
kirbuchi
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Stop DHCP client from receiving old IP address on new VLAN

I have one DHCP server running Windows Server 2008 R2. It is configured with one Superscope which contains 5 member scopes. One scope for each one of my subnets. Here is the problem, if I am on VLAN 12 I get a VLAN 12 IP but if I disconnect my…
Ruisu
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Two DHCP server in the same subnet

So I change jobs recently and in this new workplace I've found that we've actually got two DHCP servers. In the very same subnet, and they both have the same scope. I did not set up this but I see there are a lot of IP address conflicts, which must…
Kenny Bones
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Why is this checkbox disabled in Windows DHCP server range policy / vendor class management?

I manage several Windows 2012 based DHCP servers and on one of these I came across a peculiarity that I cannot explain and do not know where to correct: In DHCP manager*, expand [server name], then IPv4, policies (or [network], then policies).…
Hagen von Eitzen
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Windows DHCP Server not responding to relay requests

I have a Windows Server 2016 (Datacenter Core) running DHCP server role which is not responding to DHCP requests which come from a DHCP relay but is responding to DHCP requests on the local network. The server running the DHCP role has an ip address…
digitalPhonix
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DHCP Server Listing Host as "BAD_ADDRESS" and not Registering DNS

Question Why is DHCP showing "BAD_ADDR", why does it think there is a Conflict, and why can't the host register its DNS name? Devices: DHCP Server = Server 2012 on bare metal. Also running DNS. Host = Ubuntu 16 Server on ESXi. For testing…
Copy Run Start
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How to disable NetBIOS over TCP/IP on pfSense via DHCP

I have a pfSense applicance running version 2.x. I want to disable NetBios over TCP/IP via the DHCP Server so it is not activated on Windows clients. It's possible to do it with a Windows server but I can't find a way to do it properly on pfSense.…
Florent
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Does a Windows host correctly interpret dnsmasq parameters?

I have a network of Windows 10 machines served (DNS and DHCP) by a dnsmasq instance on a Ubuntu server (Ubuntu 15.10, dnsmasq 2.75). The setup basically works (dnsmasq provides addresses and manages DNS requests correctly) except for one specific…
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