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Questions tagged [isc-dhcp]

ISC DHCP is open source software that implements the Dynamic Host Configuration Protocols for connection to a local network. It is a reference implementation of those protocols, but it is also production-grade software, suitable for use in high-volume and high-reliability applications. DHCP is available for free download under the terms of the ISC License, a BSD style license.

ISC DHCP is open source software that implements the Dynamic Host Configuration Protocols for connection to a local network. It is a reference implementation of those protocols, but it is also production-grade software, suitable for use in high-volume and high-reliability applications. DHCP is available for free download under the terms of the ISC License, a BSD style license.

256 questions
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ISC DHCP server: how many IPs are in use?

I'm wondering what is the correct way to count how many IPs are in use in my network according to the dhcpd process. Is it just a matter of counting "binding state active" lines in dhcpd.leases file? Or it is something more complicated? Thanks in…
facha
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Redirect all messages from dhcpd to its own log file?

I'd like to redirect all messages from dhcpd to their own log file, rather than having them appear in /var/log/messages. Here is the configuration on /etc/syslog.conf: !dhcpd *.* /var/log/dhcpd.log The messages are redirected to…
Dave
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Is the native DHCP client for MacOS X able to send "Vendor class identifier" (opTag 60) in a DHCP request?

Is it possible for MacOS X (current version or in any previous one) to easily force DHCP client to send to DHCP server, at the beggining of the conversation - in DHCPDISCOVER packet - option "Vendor Class Identifier" (60) set to some value? I know…
plluksie
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Automatic subdomain wildcard for DHCP-DDNS additions?

I'm running dhcp-4.0.2 server and bind-9.6.1-P3. When a new Mac OSX DHCP client with the name "harry" connects to the network, the DHCP server gives it a lease, and adds appropriate A & PTR records via DDNS. This works fine; harry.my.domain points…
Igor Clark
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isc-dhcp-server does not push domain-name to client

I have installed the DHCP server (isc-dhcp-server) on my Ubuntu 20.04. The client computer (also a Ubuntu 20.04 Desktop machine) gets assigned IP address, but id doesn't get the assigned domain-name (defined via option domain-name…
rogaloo
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Isc Dhcp-allow only 1 lease from opt82 tag

I'm implementing an isc dhcp server that will be utilizing option 82 tags from our switches to hand out dhcp information/addresses I'd like to deny multiple requests with the same tag (if someone decides to connect a switch to our switch to have…
Anthony
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ISC-DHCPD & BIND9: Dynamic DNS interaction

I am running isc-dhcpd-4.4.1 and BIND 9.11.6 daemons on FreeBSD 11.2 server for a small company. dhcpd serves a number of Windows stations (assigning them mostly static IP addresses), several special-purpose devices (getting static public IP…
George JL
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ISC DHCP assign pool/subnet to certain MAC addresses

Hej, desperate here! I'm running isc-dhcp-server 4.1 here (with webmin but that's another topic) and want to give some options (tftp-server and bootfile) to network-components that I can identify by MAC address and vendorstring. However, I got to…
Jeremiah
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isc-dhcp-server doesn't start automatically

Running on Astra Linux 1.3, my dhcp service (isc-dhcp-server) is well-configured now and work as expected with a slight nuance - it works only when it's started, but a system don't run it at startup. Doing sudo update-rc.d isc-dhcp-server defaults…
Dmitry Ilukhin
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PXE boot from an other Network

so i got an problem. I set up an Router with Debian9, its task is that Clients in the Network are able to boot from an PXE Server( the PXE Server is on an other Network) I heard sth. about IP-Helper RelayAgent But i didnt find any documentation for…
Nils Schöffel
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dhcpd rewrite invalid client hostname for ddns

Im using isc-dhcpd and bind9 to do ddns. It is mostly working, but updates from clients with invalid names, like "leif_opo5" or "Danfoss Connect CC" are rejected. I changed the hostname for my phone to leif-opo5, and it got registered, but I can't…
Lenne
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DHCP DDNS + Samba AD?

I'm working on moving a small business network away from a Windows Small Business Server. I've set up the active directory using Samba, and it all works well, but I see one potential problem: Currently we depend somewhat heavily on DHCP-based…
Dessa Simpson
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Is it possible to declare two ethernet interfaces for the same host in dhcpd.conf?

Ubuntu Server 16.04 with isc-dhcp-server. Within the /etc/dhcp/dhcpd.conf configuration I have stated a reserved address for a host provisioned with dhcp this way: host laptop { hardware ethernet aa:bb:cc:dd:ee:ff; fixed-address…
dienteperro
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Block DHCP clients based on strings in hostname

Using isc-dhcp-server on Debian Jessie, I'd like to block DHCP requests based on parts of their hostnames - specifically, if the hostname contains the RegEx string somewhere "iPhone|android-". My current solution is to wait until they have a lease,…
Canadian Luke
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suse isc dhcpd dhcrelay no ipaddress

I have the following setup: Client --> eth2(10.4.0.1/16) - router / - eth1(10.3.0.1/16) --> dhcp-server(10.3.0.150) dhcp-relay If the client starts a dhcp-request it receives the dhcp-relay and the dhcp-relay forwards…
JonesK
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