Thank you for you're comment/answer. I will do a search for earlier comments, I 
have noticed your name in discussions regarding this topic. 

I am not entirely sure what security benefits MS-PAC has, over no PAC/PAD at 
all, besides offloading the directory-servers. If you really trust (or control) 
the other REALM, impersonation-attacks should not be a problem. If they choose 
to trust you, well, it is their security-problem, not yours. 

If you have time between the moments while you travel, might you lend us our 
opinion on the following setup: 


We have four realms in play in our setup: 

EXAMPLE.COM (IPA/IdM) 

LAB.EXAMPLE.COM (IPA/IdM)
SAD.EXAMPLE.COM (Samba-based Active Directory)
MAD.EXAMPLE.COM (Microsoft-based Active Directory) 

My hope is to achieve the following: 

LAB.EXAMPLE.COM will have a one-way trust-relationship to EXAMPLE.COM (Users in 
EXAMPLE.COM will be trusted the LAB-realm). The three other realms 
LAB.EXAMPLE.COM, SAD.EXAMPLE.COM, MAD.EXAMPLE.COM will be a playground for 
trust between IPA and AD. 

Since our MAIN realm will not trust any other realm, I assume we don't risk any 
treats by turning of MS-PAC there? Though, I am not sure if there are other 
consequences that I haven't foreseen by doing that. (We don't have any 
windows-servers/services in production there) And it does work to turn off 
MS-PAC (switch to PAD) in one of the realms, for trust to behave as we expect 
(in any direction). At least in the test I made today between two IPA-based 
realms.  

Best Regards, 

Jostein Fossheim
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