ugh. It doesn't look like we can do this until this patch happens. The actual authentication would use DUO. Since that requires the user to respond, the delay could be significant. 10 sec is definitely not enough.

This looks like a client patch. We're using Ubuntu for our clients. (RHEL for the KDCs.) We have purchased support, but the PO is waiting in Purchasing. So I may be able to help get it into Ubuntu.

From: Alexander Bokovoy <abokovoy@redhat.com>
Sent: Monday, February 12, 2024 2:45 PM
To: FreeIPA users list <freeipa-users@lists.fedorahosted.org>
Cc: Charles Hedrick <hedrick@rutgers.edu>
Subject: Re: [Freeipa-users] reliability of external radius
 
On ðÁÎ, 12 ÌÀÔ 2024, Charles Hedrick via FreeIPA-users wrote:
>Currently our department uses passwords in IPA, with a few users using
>OTP. I'm considering using a University radius server for most users.
>Are there reliability implications? My concern is what happens if the
>radius server is slow to respond or even is down. I'd like users with
>accounts in IPA to still work, and I'd hope things would survive
>conditions of slow response.

There is one potential issue that we fixed recently in MIT Kerberos:
https://github.com/krb5/krb5/pull/1318

It is not yet part of any release. If you have RHEL subscription, making
it known to RHEL support organization might help to get this fix out
faster.




--
/ Alexander Bokovoy
Sr. Principal Software Engineer
Security / Identity Management Engineering
Red Hat Limited, Finland