ISC DHCP server ignores fixed address specification for Circuit-ID

[Patrick Trapp]

Probably irrelevant to the larger conversation, but I am successfully using circuit ID to determine if a host belongs to a class. I only share that in case it's helpful to the OP if their host statements turn out to not use circuit ID like desired.

-----Original Message-----
From: dhcp-users <dhcp-users-bounces at lists.isc.org> On Behalf Of Simon Hobson
Sent: Tuesday, November 20, 2018 3:31 PM
To: Users of ISC DHCP <dhcp-users at lists.isc.org>
Subject: Re: ISC DHCP server ignores fixed address specification for Circuit-ID

codedd713 <codedd713 at protonmail.com> wrote:

> I observed this behavior (below) on ISC DHCP server. Was wondering if this is to be expected or perhaps I overlooked some element.

Yes you've overlooked a critical bit of knowledge - something that's tripped up a few people over the years. All host declarations are global in scope - even when written within a subnet declaration. So the host statement matching the MAC address will always match - even when the client is in the other subnet. This may well prevent the other host declaration from matching - don't know what happens if two host declarations match a client.

Also, I don't know if you can match on that option (circuit ID). AIUI there are only a small number of fields you can match on within a host statement.

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