Issues in using User Class Option

Jain, Saurabh Saurabh.Jain at
Fri Dec 15 05:22:48 UTC 2017


Sumant is my colleague and I have the mentioned patch applied in DHCP 4.3.5.  But when I am using the concept of class and subclass I am facing issues. Server is not responding back with the class data. Please see mails below.

Also when I configured dhcp6.vendor-opts without defining classes and subclasses, than even with the mismatch in enterprise Id I configured and the requested enterprise Id in solicit packet, server is sending back with the configured enterprise Id.

Saurabh Jain

From: dhcp-users [mailto:dhcp-users-bounces at] On Behalf Of Thomas Markwalder
Sent: Thursday, December 14, 2017 7:23 PM
To: dhcp-users at
Subject: Re: Issues in using User Class Option


There was an issue introduced in ISC DHCP 4.3.5 which broke the server's ability to send dhcp6.vendor-opts.  This
has been corrected in our upcoming feature release, 4.4.0, due out Q1/2018:

- The ability of the server to send back dhcp6.vendor-opts values has been
  restored. A change in 4.3.5 (see #29246) which enabled it to send back the
  FQDN option unfortunately broke its ability to send back dhcp6.vendor-opts.
  Thanks to Sumant Gupta (sumantgupta at gmail dot com) of Landis+Gry for
  bringing this issue to our attention.
  [ISC-Bugs #46427]

It will be included in our next maintenance release, 4.3.7, but it's date is TBD>

I have attached a patch which corrects the issue for 4.3.6.


Thomas Markwalder
ISC Software Enigneering

On 12/14/2017 04:33 AM, Jain, Saurabh wrote:
Solicit message from fe80::daf6:c8ff:feb0:8f15 port 546, transaction ID 0x336E00
checking against class Testsubclass...
data: option dhcp6.vendor-opts = NULL


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