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".
22
questions with no upvoted or accepted answers
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VLAN ID over DHCP for Management Interface of Fortinet FortiAP
When configuring the FortiAP device it's desirable to configure the VLAN ID for the tagged management network. Accordingly to the manual it's possible to do so by "telnetting" to the FortiAP device ...
- 5,620
4
votes
1
answer
779
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Assigning option based on class membership inside the subnet section
We are looking for a way to do something along these lines in the dhcpd.conf file:
subnet ... {
#couple of options for the subnet here
pool {
allow members of "class-name1";
...
- 91
3
votes
1
answer
345
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How did AirPort's DHCP "Welcome Message" work?
I remember that Apple's AirPort base stations used to have a DHCP "Welcome Message" feature, that would display a custom pop-up dialog when computers connected to the network. How was this ...
- 191
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0
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Can ISC-DHCP bind to Option 82 rather than Mac Addresses?
We use option 82 information to limit leases presently in ISC-DHCP using a spawn with statement for our billing subclass. This keeps a single household/business from obtaining more leases than they ...
- 171
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0
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OpenVPN and dhcp-option domain-route for Windows/Linux
I am trying to understand the dhcp-options usage for Windows and Linux (Ubuntu).
There seems to be difference between the implementation.
Using OpenVPN 2.4 server and client, i test on Windows 10 21H2 ...
- 185
2
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0
answers
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setup static route via dhcp
I try to push static routes over dhcp in a redhat enviroment.
I have already activatet the option rfc3442-classless-static-routes.
The dhcp client is also configured to request this optien as ...
1
vote
0
answers
831
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How does MS DHCP server decide which DNS server to try to dynamically update?
In MS DHCP, under Scope Properties, on the DNS tab, it says:
You can setup the DHCP server to automatically update authoritative DNS servers with the host (A) and pointer (PTR) records of DHCP ...
1
vote
2
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Alpine Linux is not sending hostname to dhcp server
When alpine linux asks for ipv4 address from dhcp server, it is not sending hostname to dhcp server. So I cant access by server's hostname in LAN. Here is my setup
I am using Alpine Linux 3.12 on my ...
- 129
1
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0
answers
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OpenVPN: automatic proxy detection after connection is established
I have setup an OpenVPN server and an HTTP proxy server on the same host in cloud.
I have also configured OpenVPN client on my desktop.
I have also setup redirection rules on the cloud host to ...
- 121
1
vote
0
answers
578
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Sonicwall L2TP Server is using a "phantom" internal DHCP server
Following a few articles on options 121 and 249, I'd like to push out routes to the L2TP VPN clients using the internal DHCP server on the Sonicwall.
However, the Sonicwall seems to be using a ...
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1
vote
1
answer
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Libvirt providing bootp options without being configured to do so
I have a virtual network configured in libvirt and configured to provide DHCP (via dnsmasq) but not configured to provide bootp information (see below), but when I boot an iPXE ISO and look at the ...
- 35
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0
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How to send several instances of the vendor-specific options to a DHCP server using dhclient?
I need to send vendor-options to DHCP server using dhclient (ISC).
I've added following lines in the dhclient.conf:
option dhcp6.vendor-class code 16 = {integer 32, integer 16, string};
send dhcp6....
- 11
0
votes
1
answer
119
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How do I deploy correctly my DHCP Servers with DHCP Option 82?
My Goal is to achieve a seperate DHCP Pool on my switches, how am I able to achieve it on a flat network hosted for a LAN-Party. Which means seperate VLANs should be avoided
We're talking about ...
0
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1
answer
111
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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 ...
- 101
0
votes
1
answer
445
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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 ...
0
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1
answer
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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
...
0
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0
answers
414
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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 ...
- 111
0
votes
0
answers
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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 00:00:0d:e9:00:0b:00:06:...
0
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0
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526
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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 ...
0
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1
answer
273
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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 ...
0
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0
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DHCP server assigning same IP address even if Computer is connected in different VLAN
DHCP Server OS - Windows Server Standard 2008 R2
DHCP Client OS - Windows 7, Linux based OS etc..
I have configured DHCP Server on Windows Server Standard 2008 R2 with SuperScope. Let assume that i ...
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-3
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1
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Windows Server 2019 DHCP Option 33
Noticed there is an option in DHCP for static routes, looks like it is using a server name and an IP that you assign, is this the same thing as adding an entry into the host record like we used to do ...
