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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.

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isc-dhcp-server fails if interface not connected on reboot

On Ubuntu 18.04 on my gateway server, I've installed and configured isc-dhcp-server, but it doesn't start up (i.e. it fails to start) if there's nothing connected to enp2s0 after a reboot. Note it says "Not configured to listen on any…
Sean McCarthy
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Replay DHCPDECLINE to host by edit ethernet address in dhcpd

I known in dhcpd.conf, I can use following config to assigned a fixed ipv4 address to a client. host h1{ hardware ethernet 11:22:33:44:55:66; fixed-address 192.0.2.2; } range 192.0.2.100 192.0.2.199; But what should I do if I just…
qin
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How to add more than 32 routes to isc-dhcp-server and separate them to 2 fields?

Is there any way to add long list routes to server? Actually now I can add only 32 routes because we have only 1 octet for them. After adding more than 32 routes I received "Malformed packet" by Wireshark. But Iam sure that I can add more than 32…
Ain Mditrevi
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ISC-DHCPD & BIND9: Adjust hostname for BIND ddns registration

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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Proxmox KVM IPv6 Routed not working

I got a /48 v6 assigned by my Provider with a dedicated server, on which I did install Proxmox 5. My Issue is, that the dhcpdv6 should assign the VM a fixed ip, but it does not get the IP assigned. I also deployed a ndpd. My current network config…
Ne00n
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windows machine gets assigned wrong netmask

I have a Debian based DHCP server. It assigns correct netmask 225.225.225.0 for all devices (WiFi router, voip, scanner) except for the windows machines. They all get assigned 224.0.0.0 for some reason. They are all set to receive IP over DHCP; no…
Sergey
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Exclude subnets from distribution?

In Windows' DHCP server it is possible to exclude an entire subnet from being given out to clients which doesn't have a reservation. They call this "IP addresses excluded from distribution". Now I would like to do the same on Linux' DHCPD. So I have…
Sandra
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ISC-DHCP-SERVER adding incorrect reverse zone entry

I have ISC-DCHP-Server and BIND9 running on Debian Stretch. I am trying to setup Dynamic DNS for my client computers, but I'm struggling with the reverse zone. Currently, when computers request an address with DHCP, an entry is created in the…
Canadian Luke
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Why would ISC dhcpd ignore vendor options?

I'm trying to use an existing dhcpd to autoconfigure Raritan networked PDUs. This works roughly like PXE booting: there are additional DHCP options that direct the device to fetch a config file via TFTP. However, it uses vendor DHCP options to do…
AnotherHowie
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Disabled dhcp-server on router prevents clients from getting an address

I have a weird issue on my local network which prevents some clients, sometimes acquiring an ip address from the real dhcp-server (x.x.x.3). The dhcp-server is a CentOS VM running isc-dhcp-server for ipv4. The router from my ISP, a Sagemcom has the…
oneindelijk
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How can I configure DHCP server to issue the same fixed-address by matching with the client identifier in the discover message

I am able to config fixed ip address with hardware ethernet options, but i am trying to assign fixed ip based on client id(option 61) from DISCOVER message. I tried with below configs , but it doesn't help. host virtual_1 { …
user1290
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Option 81 in DHCP

Just curious about this. When we enable option 81 on a DHCP network, the DHCP server will start updating the zone that comes along with the client's FQDN. Now, how would client will ever know its domain even before getting an IP address? My…
Vignesh SP
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How can I assign static IP address with a specific gateway in an ISC DHCP Server?

I have a router whose WAN Gateway I want to modify, without other routers in the network being affected. I want to test how the network behaves if I change the gateway for only one router. How could I perform this inside the /etc/dhcp/dhcp.conf…
Geiser
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how to block incoming DHCP DISCOVERY messages

I'm running ISC DHCP deamon on centOS and want to block unwanted(by clients MAC address) discovery messages before they reach dhcpd. how can I do this with iptables or anything else?
misha
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dhcpd daemon taking huge amount of memory and restarting with out of memory error

I have to configure isc-dhcp-server for 1 million clients which listens on 4094 vlan tagged interfaces, where each vlan interface is mapped to a subnet declaration. Therefore in total 4094 subnet declarations in conf file with 253 clients in each…
user8070445
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