Multiple Windows Domains

Adam Bishop Adam.Bishop at
Thu Oct 26 18:02:32 CEST 2017

On 26 Oct 2017, at 14:51, Brian Smith - IN2IT <bsmith at> wrote:
> Has anyone done anything like this using FreeRadius? 

Most of the problems aren't FreeRADIUS problems - FreeRADIUS can certainly do what you've described, but it is dependant on you being able to supply it useful information:

* Identifying users - how do you tell Company A's users from Company B's users? Do they have different @realms? Different DOMAIN\ ?
* The above will influence your backend - if you use Samba (for machine authentication), getting it to authenticate multiple domains is hard/impossible, so you'd likely need at least 1 server per domain, fronted by additional RADIUS servers to route the requests. If you use LDAP directly you could use a single instance, but integrating with AD using raw LDAP has some challenges. You could also try adding a 6th domain with trusts to each of the 5 domains. EAP type used has a large impact here - if you use EAP-TLS with user certificates, you may not even need to communicate with the domains.
* What policy do you need to implement? Should Company A be able to log on from access points at company B? Do you need to classify users into groups?
* How will the addresses be assigned? Using RADIUS, or dynamic VLAN assignment and DHCP?

It's likely that unless your environment does something very specialised or non-standard, you can make everything work, but you need to provide more information before anyone can tell you what configuration to use.


Adam Bishop

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