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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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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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Tell connected devices that this network does not offer internet access

I installed the isc-dhcp-server (version 4.3.3) onto my Raspberry Pi and set it up to assign IP Addresses to devices that are connected to the Ethernet port (via a Switch but that should be unrelated). This network is only for Ethernet purposes and…
Tim Schumacher
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isc-dhcp send packet not permitted when using iptables snat

I'm having this issue with iptables snat and isc dhcp. This is the case: I have configured 2 IPs in my network card. Primary and secondary OS: Ubuntu 16.04 2: ens32: mtu 1500 qdisc pfifo_fast state UP group default…
Michael Alvarez
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DHCP Client starts sending DHCP Discover messages upon receiving a NAK from another DHCP server

I am trying to set up a DHCP client that is supposed to get its IP address via DHCP. I have configured two DHCP servers (one in 192.168.X.X pool and the other in 162.16.X.X pool). Then, the client starts the DHCP protocol and obtains a DHCP lease…
Anand Gokul M
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How do I setup a secondary default gateway using classless-routes in isc dhcp?

Here is a snippet of my dhcpd.conf file subnet 10.3.0.0 netmask 255.255.0.0 { option classless-routes 16, 10,2, 10,3,0,110,16,10,4,10,3,0,110,0,10,3,0,110; } It generates the following routes default via 10.3.0.110 dev eth0 10.2.0.0/16 via…
Wayne Gemmell
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