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Questions tagged [dhcp-option]

The Dynamic Host Configuration Protocol (DHCP) provides a framework for passing configuration information to hosts on a TCP/IP network. Configuration parameters and other control information are carried in tagged data items that are stored in the 'options' field of the DHCP message. The data items themselves are also called "options".

The primary reference is defined in:

  • RFC 2132 - DHCP Options and BOOTP Vendor Extensions
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Is `127.0.0.1` a special token for Ubuntu 14 LTS `resolvconf` when DHCP pushes DNS settings?

Dear Linux Graybeards, Is 127.0.0.1 a magic token for resolvconf in Ubuntu 14 LTS when using DNS settings pushed by DHCP? I'm using Ubuntu 14.0.3 (LTS) in AWS (ami-0f8bce65) with custom DNS settings in my VPC's DHCP Options. I can push multiple DNS…
Steve Jansen
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How can a dhcp client in linux can send the dhcp option 60 - specifying the vendor-id?

I am using fedora core machine. My linux- fedora core machine - client wants to send the dhcp option 60 specifying the vendor id to the dhcp server. Next, I want to read the dhcp option 43 send by the server. Already, I know that the dhcp server is…
dexterous
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How to trigger DHCP request and inspect the reply from DHCP server

Is it possible to trigger a DHCP request from my DHCP server and then sniff and inspect the whole DHCP reply from the server to see what options/parameters it sends to the clients?
tox
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Which DHCP clients use which options?

I would like to use my DHCP server to give information about some local services like ntp, using DHCP options as explained in the dhcp-options(5) manpage. Does anyone here know, or is there a good document on the net, which options I can reasonably…
jstarek
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Implementing rfc3442 (classless static route) in Freeradius DHCP server

I am trying to setup a Strongswan server that runs in split tunnel mode, which means I have to disable using the server as a default gateway on client side and also disable classfull routing in the VPN client. I then have to send DHCP option 121…
Lasse Michael Mølgaard
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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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How can I implement single letter domains for LAN internet browsing using dnsmasq?

In our LAN I have several services running in multiple hosts, and clients using DHCP with dnsmasq. My goal is that any user can type a single letter (e.g. c) in the browser search bar and get in return the HTTP response of a local HTTP server at…
Sebastian
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How can we add multiple pool in wide-dhcp6s server configuration file

I am using wide-dhcp6s as dhcpv6 server in my linux pc, i am trying to add 2 pools but only one pool is working. my configuration is shown below. interface bdg3 { allow rapid-commit; address-pool pool1 86400 86400; address-pool pool2 86400…
Dhaneesh lal.D.R
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isc-dhcp 4.2.5 does not support dhcp-client-id and vendor-class-id?

I have isc-dhcp-4.2.5 server and client installed on two CentOS-7.4 boxes. I know this is quite old distro, but I can't change it for various reasons. Dhcp server configuration: option domain-name "mydomain.org"; option domain-name-servers…
Mark
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How i can assign /32 ip address to openstack nova instance without float ip?

I'm developing a custom panel for my openstack home lab via rest api. I've investigated Hetzner cloud ip (v4) addressing mechanism and i found it is like this: It is assigning /32 valid ip v4 address and routing via invalid ip for preventing ip…
Vahid Alimohamadi
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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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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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Define multiple filename options in DHCP config based on different range

Intro I am trying to use a centos box for DHCP and TFTP function, for iPXE boot. I have one subnet configured for DHCP, but it has multiple ranges and each range has a different iPXE boot URL. Problem Problem is that once the hosts boot into iPXE,…
Virtual Cloud
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How to get custom option on client from ISC DHCP server

Over ISC-DHCP server I wanted to define a custom DHCP Option, for which I am using below config option imagefile code 224 = ip-address; subnet 192.168.29.0 netmask 255.255.255.0 { range 192.168.29.1 192.168.29.244; option imagefile…
Ruchir Bharadwaj
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How to include vendor-specific option 17 suboptions 11, 12 and 13 in DHCPv6 solicit/request using dhclient

My request is to include option 17 sub-options 11, 12 and 13 in DHCPv6 solicit/request and I configured the same in dhclient6.conf on my Ubuntu as below. send dhcp6.vendor-opts…
kottesvaran m
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