DHCP server configuration does not work for all clients

Jim Yang zy33 at cornell.edu
Thu Oct 8 20:55:11 UTC 2020

Hi Niall,

Thank you for your reply.
class “mytest” {
          match option dhcp-client-identifier;

It seems that I should change the class definition to match either option dhcp-client-identifier or hardware.

class “mytest” {

            match pick-first-value (option dhcp-client-identifier, hardware);


From: dhcp-users <dhcp-users-bounces at lists.isc.org> on behalf of Niall O'Reilly <niall.oreilly at ucd.ie>
Reply-To: Users of ISC DHCP <dhcp-users at lists.isc.org>
Date: Thursday, October 8, 2020 at 3:46 PM
To: Users of ISC DHCP <dhcp-users at lists.isc.org>
Subject: Re: DHCP server configuration does not work for all clients

On 8 Oct 2020, at 20:25, Jim Yang wrote:

Is this a DHCP sever software bug or something else?

Whenever I’ve been surprised by behaviour like this,
it’s been due to a subtle bug in my configuration,
and never to a server software bug.

You show us

subclass "mytest" 1:74:A7:11:22:33:44;

but I can’t see your definition for

class “mytest” { … }

so can’t tell what the value in your subclass
statement is being matched against.

It’s been a while since I’ve needed to configure and run an ISC DHCP server,
so I had to check the relevant section of the documentation:

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