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List:       freeradius-users
Subject:    Re: question about DHCP-DHCP-Server-Identifier
From:       Nick Porter <nick () portercomputing ! co ! uk>
Date:       2023-07-23 18:23:33
Message-ID: b646988a-b8a5-1a0e-4ba7-546829f56460 () portercomputing ! co ! uk
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On 21/07/2023 20:29, Levi Baber via Freeradius-Users wrote:
> A. this wasn't part of the example options, so I assumed it would not
> be need to be added
> B. DHCP-DHCP-Server-Identifier is already defined under "update
> control" in both DHCP-Discover and DHCP-Request sections of
> raddb/sites-enabled/dhcp
> C. comments in raddb/sites-available/dhcp said to use either
> dhcp_common or dhcp_network - but not both. I noticed the option
> difference between raddb/policy.d/dhcp and
> raddb/mods-config/files/dhcp was DHCP-DHCP-Server-Identifier, and
> adding it has fixed my problem.
>
> Basically I just want to be sure I'm not doing something dumb by
> adding it where I have it, and that I'm correctly understanding how
> the config files are intended to work.

Yes, DHCP-DHCP-Server-Identifier should be set in the reply packets - 
that is used off the back of an Offer to tell the client where to sent 
the Request.

For the use of the dhcp_network policy, this can either be done, as you 
have, by adding it to the files module data or by adding some policy to do

update reply {
     DHCP-DHCP-Server-Identifier := &control.DHCP-DHCP-Server-Identifier
}

The entry in the control list is intended for policy driving, 
particularly in relation to handling Request packets - i.e. ignoring 
requests that are not for the current server, allowing for multiple DHCP 
servers to serve the same network.

Nick

-- 
Nick Porter


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