Here's some PowerShell you can use to list all the NTDS connections between domain controllers in an Active Directory environment:
Import-module ActiveDirectory
Get-adobject -filter {Objectclass -eq "NTDSConnection"} -searchbase "CN=Configuration,DC=contoso,DC=com" -properties distinguishedname,fromServer | fl distinguishedname,fromServer
Just replace contoso with the name of your own domain.
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Mitch Tulloch is an eleven-time recipient of the Microsoft Most Valuable Professional (MVP) award and a widely recognized expert on Windows Server and cloud computing technologies. Mitch is also Senior Editor of WServerNews. For more information about him see http://www.mtit.com.