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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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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 deprecated for a long time. As referenced in this…
Michael Firth
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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) 192.168.0.5/24 Just added the 8 port PIM Ethernet card,…
Chalen
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DHCP server IP reservation during the "offer" step

How long is the IP reserved by the DHCP server, when it sends the offer message? Imagine the client does not send back the request message, after how much time is the IP available again? Thanks for your help.
ragnar
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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, by setting DHCP scopes for servers and setting for…
Zoran Jankov
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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 ensure that a client identified by its hardware…
Mark
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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…
asm_nerd1
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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 error when I start the DHCP server. When I run…
frissyn
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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. Now I noticed that the DDNS update only works…
dom
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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 the clients' router, I don't know what settings…
tomas
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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 different option 240 string. How do I do that in…
Danny Christensen
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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 DNS for all names and IP addresses. I know I can…
jdm
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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"; …
Anand Bajpai
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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 - also this my dhcpd.conf set clientmac =…
hodl
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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 thought this situation may cause the error. I…
mrtz
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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 I can't find a way to force an address change…
tom654321
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