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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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Computer gets IP from DHCP server but has no internet connection

I've installed an isc-dhcp-server on Ubuntu 12.10 and I'm trying to setup a DHCP server on a head node for six worker computers in the local network. The head node itself is a DHCP client receiving the IP-address 192.168.20.1 (on eth0) from an other…
user2611216
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Cannot assign IP address according to an option parameter

I have this DHCP conf file: authoritative; option domain-name "XXX.XXX.XX"; allow bootp; ddns-update-style ad-hoc; class "karpuz-kabugu" { match if (substring (option user-class, 0, 6) = "karpuz"); log (info, "karpuz-kabugu"); } …
Alptugay
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isc-dhcpd static ip within range

I have a isc-dhcpd server with dhcp-range 10.0.0.10 - 10.0.0.20. There is also a device connected with static ip 10.0.0.10. What would happen when a client with dynamic ip connects to the network? What if I changed the static ip to 10.0.0.20, and…
Jon
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Can ISC DHCPD operate as a Proxy DHCP server for PXE boot?

I have an existing LAN with a DHCP server already dishing out IP addresses. For various reasons I cannot replace that server so it will still need to dish out IP addresses. I've been experimenting with Dnsmasq in Proxy mode to provide PXE boot…
hookenz
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Is there a match on incoming interface in DHCPd classes?

(Note, the title of the question Is there a way to classify DHCP requests based on the interface they're coming from? is what I want answered, but it doesn't actually ask that question for a non-dhcp relay situation, and the answer doesn't help here…
Nick Bastin
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Iptables - Allowing only a single dhcp (relay) client

I am trying to create a firewall rule on an Ubuntu 10.04 server running isc-dhcpd. I only want dhcp to be accessible by a single relay host (172.1.1.1). I have iptables set up like so: # iptables -vnL Chain INPUT (policy ACCEPT 5325 packets, 523K…
Cory J
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Windows 7 Failing Ping on IPv6 in DHCP Setup

I have set up a test ISC DHCP server that is not connected to an internet with DHCP and DHCPv6. I also have a Cisco 3750G with IPv6 enabled. I have firewalls off on both machines. My Windows 7 machine will get both an IPv4 and an IPv6…
bradlis7
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Configuring isc-dhcpd server for DHCPv6 with multiple NTP addresses

I'm trying to configure a DHCPv6 server to provide more than one NTP address (option 56) using the isc-dhcpd server. Is there a currently supported way of doing this? My first attempt was defining a custom option 56 in the configuration to be an…
vbeljan
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Clear routes from DHCP option 121

I have 3 subnets 192.168.10.0/24 192.168.103.0/24 192.168.2.0/24 Most of them can route to each other via static routes defined in their respective default gateways. However due to some interesting... hardware it is not possible to configure routes…
Qowy
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How do I purge dhcpd.leases?

I'm running DHCPD (isc-dhcp-4.2.4) on an Ubuntu 14.04 system. The var/lib/dhcp/dhcpd.leases file is getting pretty huge (350MB). Looking in it, there's historical data going back many months about leases that have long since expired. How do I…
kbro
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DHCP client doesn't get address

I'm trying to use a Phytron MCC-1 motor controller which gets its IP only via DHCP (no manual setting). I setup isc-dhcp-server on ubuntu as such: # /etc/dhcp/dhcpd.conf option domain-name "example.org"; option domain-name-servers ns1.example.org,…
dargaud
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How to use omshell with ICS DHCP?

In /etc/dhcp/dhcpd.conf have added omapi-port 7911; omapi-key testkey; key testkey { algorithm hmac-sha256; secret QUt1z1O3fxqgSDKILAMXFA==; } but it won't let me connect when I do # systemctl restart dhcpd # omshell > server localhost > key…
Sandra
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fixed-address is not behaving properly with DHCP version 4.2.5

If I configure an IP address range in dhcp, and allocate two addresses to two different MACs using fixed-address, and if those two or one of the systems is not active in the network, then the corresponding IP address is getting assigned to some…
Kiran
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ISC DHCP (Infoblox) takes 30+ seconds to respond to DISCOVERS

Client's DISCOVER packets reach the Infoblox DHCP server through DHCP relays, but Infoblox doesn't seem to be responding. I checked the pcap taken from the DHCP server, I can see there is 3 DISCOVERS from the Client (via Relay), Infoblox DHCP…
Vignesh SP
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VyOS equivalent of "deny unknown-clients" from dhcpd

I'm attempting to use VyOS as a router and move my dhcp server functionality into it. In my current setup, I have a subnet that only allowed statically mapped clients. I can easily get the static maps to work with VyOS, but I don't know how to…
seanr8
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