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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 it possible to set a dhcp option 77 value in vsphere as a config parameter so vNIC ROM (e1000/vmxnet3) uses it during PXE?

I'd like to set a dhcp option 77 string value in vsphere as a config parameter on a vm or vm template so that the vNIC ROM (e1000/vmxnet3) uses it during the DHCP part of PXE. My goal is to have PXE booting nodes self identify using a dhcp option 77…
Padge
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Cant deploy images with WDS: PXE-E16: No offer received

I am currently playing around with a WDS lab environment on a virtual 2012 R2 server, which is patched to the latest available update-level. This server is running the DHCP server role and has two NICs configured. One NIC is bound to a private…
Matthias Güntert
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ISC dhcpd dynamic bootfile-name. Is this possible?

Actually I want to dinamically assign bootfile-name based on clients MAC. I have tried this config: option bootfile-name concat( binary-to-ascii(16, 8, "", substring (hardware, 1, 6)), ".cfg"); But this is wrong config (as dhcp server isn't…
halt
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Why use FQDN as DNS-server option in DHCP?

I've seen multiple default configurations of DHCP-servers with a FQDN set as the DNS-server option. Doesn't this imply a catch-22, or the need for that DNS-server to be in the hosts file of every single client? example from dhcp3-server in debian…
Filip Haglund
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Mac OS X Server Configure DHCP Options 66 and 67

I need to configure Mountain Lion (10.8.2) OS X Server BOOTP to provide DHCP options 66 and 67 to provide PXE booting for PCs on my network. I have tried following the bootpd MAN pages, but they are not specific enough. I have also read conflicting…
Paul Adams
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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 described in…
Christian Schellschmidt
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How to pass a vendor-specific options to a DHCP server using dhclient?

I need to send vendor-options to DHCP server using dhclient (ISC). As I understand I need to describe that options in the dhclient.conf. Do I need make new "space" for options? Or I can do "send"? Can someone help me with this or give me, please,…
Hedgehog
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Is the native DHCP client for MacOS X able to send "Vendor class identifier" (opTag 60) in a DHCP request?

Is it possible for MacOS X (current version or in any previous one) to easily force DHCP client to send to DHCP server, at the beggining of the conversation - in DHCPDISCOVER packet - option "Vendor Class Identifier" (60) set to some value? I know…
plluksie
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What happens when specifying multiple dns servers with DHCP Option 6?

If I have the following DHCP option 6 (DNS), what happens? 6,1.1.1.1,8.8.8.8 Will 1.1.1.1 be served, and 8.8.8.8 as fallback if 1.1.1.1 fails? Extra context: I am running odhcpd on OpenWRT with pi-hole as my DNS server, and want to have an automatic…
drum
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dhcrelay append option 66 and 67

I'm running a PXE Linux server in a VLAN. How is it possible to use [dhcrelay][1] to forward the DHCP requests to the main DHCP server and add the options for PXE with dhcrelay? I've tried something like that: dhcrelay -d -i eth0 10.0.0.42 -a -m…
qwertbert23
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Assigning a hostname of the fqdn assigned to a dhcp client with dnsmasq?

I'm aware that you can assign static DNS entry names by doing the following in dnsmasq.conf: address=/wiki.leerdomain.lan/192.168.1.200 ptr-record=wiki.leerdomain.lan/192.168.1.200 and then assigning a static ip address using the mac address of the…
leeand00
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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 redirect all port 80 and 443 traffic to the proxy…
mdk
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dhcpd option 82 logging not working

We are implementing Option 82 in our network and I am just scratching the surface of how to setup my server. I have successfully created my first Option 82 ACL based on the agent circuit ID that is contained in the packet, now I just need guidance…
user53029
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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 phantom internal DHCP server that's handing out IPs…
gravyface
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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 traffic in wireshark I see that the DHCP service on…
Gestellen
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