DHCP server configuration does not work for all clients

[Niall O'Reilly]

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:
https://kb.isc.org/docs/en/isc-dhcp-44-manual-pages-dhcpdconf#SUBCLASSES

/Niall
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