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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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Linux DHCP server option 43 vendor-encapsulated-options, how to format/encode?

I admin the network for a small business which has an IPCop firewall box providing DHCP services to the network (and various other services). The DHCP server in IPCop appears to be dhcpd and IPCop provides a web-based front end to editing the…
batfastad
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Two DHCP server in the same subnet

So I change jobs recently and in this new workplace I've found that we've actually got two DHCP servers. In the very same subnet, and they both have the same scope. I did not set up this but I see there are a lot of IP address conflicts, which must…
Kenny Bones
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rfc 6939 support for dhcpv6 relay

isc-dhcp-server now supports rfc6939 as of version 4.3, and I would like to be able use it as it is quite nice to be able to just use the mac address to identify dhcpv6 clients. However, I can't seem to find a dhcpv6 relay that supports rfc 6939,…
Bryce Larson
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How to disable NetBIOS over TCP/IP on pfSense via DHCP

I have a pfSense applicance running version 2.x. I want to disable NetBios over TCP/IP via the DHCP Server so it is not activated on Windows clients. It's possible to do it with a Windows server but I can't find a way to do it properly on pfSense.…
Florent
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Does a Windows host correctly interpret dnsmasq parameters?

I have a network of Windows 10 machines served (DNS and DHCP) by a dnsmasq instance on a Ubuntu server (Ubuntu 15.10, dnsmasq 2.75). The setup basically works (dnsmasq provides addresses and manages DNS requests correctly) except for one specific…
WoJ
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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 and setting the variable AP_MGMT_VLAN_ID by…
Vinícius Ferrão
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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"; allow members of "class-name2"; range ip1…
Andrei
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Server 2012R2 DHCP & DNS Updates

I have the following DNS settings configured on an DHCP scope: My question is, will the DNS entry be made against the DNS server that the DHCP is configured to go against or will it update the DNS server of the underlying client of the DHCP…
duhaas
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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 accomplished? I'm trying to duplicate this feature on a…
Trevor Johns
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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 should. The issue we have is ISC-DHCP ties leases…
Mythics
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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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How to save DHCP option 43 on Windows 2008 server?

I need to retrieve the DHCP option 43 from my DHCP server (Linux ISC DHCP server) on a Windows 2008 server (or any other Windows version, as long as the code 43 is specified in the Parameter request list (code 55)). I can see the wanted value with…
RaphDG
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DHCP IPV6 Environment

May I know what are the changes needed in the DHCP message formats if I want to convert into ipv6 environment? Now I am using ipv4 dhcp client and ipv4 dhcp server. But I want to implement this using ipv6 dhcp client and ipv6 dhcp server. Tell me…
ramulu ponnam
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DHCP Option in HSRP /VRRP

I'm configuring HSRP having scenario described in figure below. One gateway is active for one network and standby for other network and vice versa for other gateway. DHCP is configured on both Gateways and clients get automatic IPs. My question is…
Kashif Minhas
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DNSMASQ Specify Port Number in dhcp-option=6

I run Ubuntu 16.04 LTS. I want to redirect DNS requests coming from some ip[-range] to another instance of dnsmasq on port 1995. To do so I added these lines in /etc/dnsmasq.conf file :…
Chitholian
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