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These pages describes simple tips to setup and configure cross-forest trust between an IPA domain as well as an advertisement (Active Directory) domain.


  • 1 Description
  • 2 Prerequisites
    • 2.1 IPv6 stack usage
    • 2.2 Trusts and Windows Server 2003 R2
  • 3 Assumptions
  • 4 Install and configure IPA server
    • 4.1 make certain all packages are as much as date
    • 4.2 Install needed packages
    • 4.3 Configure host title
    • 4.4 Install IPA host
    • 4.5 Login as admin
    • 4.6 Make sure IPA users can be obtained to your system solutions
    • 4.7 Configure IPA host seeking arrangement reviews for cross-forest trusts
  • 5 Cross-forest trust list
    • 5.1 Date/time settings
    • 5.2 Firewall setup
      • 5.2.1 On AD DC
      • 5.2.2 On IPA host
        • Firewalld
        • iptables
    • 5.3 DNS setup
      • 5.3.1 Conditional DNS forwarders
      • 5.3.2 If AD is subdomain of IPA
      • 5.3.3 If IPA is subdomain of advertising
      • 5.3.4 Verify DNS setup
  • 6 Establish and trust that is verify cross-forest
    • 6.1 incorporate trust with advertisement domain
      • 6.1.1 When advertisement administrator qualifications can be obtained
      • 6.1.2 When advertisement administrator qualifications are not available
    • 6.2 Edit /etc/krb5. Conf
    • 6.3 enable access for users from AD domain to protected resources
      • 6.3.1 generate external and groups that are POSIX trusted domain users
      • 6.3.2 Add trusted domain users towards the outside team
      • 6.3.3 Add outside team to POSIX team
  • 7 Test cross-forest trust
    • 7.1 Utilizing SSH
    • 7.2 Making use of Samba stocks
    • 7.3 Utilizing Kerberized internet applications
  • 8 Debugging trust
    • 8.1 General debugging recommendations
    • 8.2 problems because of exhausted DNA range on reproduction


These pages describes just how to setup and configure cross-forest trust between an IPA domain and an advertising (Active Directory) domain.


  • FreeIPA 3.3.3 or later is preferred
  • Windows Server 2008 R2 or later on with configured advertisement DC and DNS installed locally in the DC

You can follow article Setting up Active Directory domain for testing purposes if you need to install and configure advertisement DC for testing purposes.

IPv6 stack use

Suggested means for modern networking applications is always to just available IPv6 sockets for paying attention because IPv4 and IPv6 share the exact same port range locally. FreeIPA makes use of Samba as an element of its Active Directory integration and Samba requires enabled IPv6 stack from the device.

Adding ipv6. Disable=1 into the kernel demand line disables the IPv6 stack that is whole

Adding ipv6. Disable_ipv6=1 could keep the IPv6 stack functional but will likely not designate IPv6 details to virtually any of one’s community devices. This might be recommended approach for situations once you do not utilize IPv6 networking.

Creating and contributing to for instance /etc/sysctl. D/ipv6. Conf will avoid assigning IPv6 details to a network interface that is specific

Where interface0 is the specific user interface.

Observe that all our company is requiring is that IPv6 stack is enabled during the kernel level and also this is recommended method to develop networking applications for a very long time currently.

Trusts and Windows Server 2003 R2

As noted above, the necessity for trusts is Windows Server 2008 R2. While cross-forest trusts had been included with woodland practical degree Windows Server 2003, you can find extra needs imposed by usage of AES encryption kinds which need domain functional degree Windows Server 2008. You’re able to begin a trust between a FreeIPA server and Windows Server 2003 R2, with restricted functionality with just RC4 and DES encryption kinds. Next paragraph defines the actions required to carry out this. Take note, but, that it is unsupported, extremely experimental and of extremely restricted value because associated with poor encryption types for trusted domain objects which are often fairly effortless cracked with current improvements in technology.

To be able to set up a trust from a FreeIPA host and a Windows Server 2003 R2, you ought to improve the forest functional degree to Windows Server 2003. For this, available ‘Active Directory Domains and Trusts’ snap-in and right-click on ‘Active Directory Domains and Trusts’ root within the pane that is left. Then choose ‘Raise forest functional degree. ‘ and employ ‘Windows Server 2003′ once the degree to increase.

Be sure this action is performed by you before developing a trust using the ‘ipa trust-add’ command. All of those other setup is the same as compared to Windows Server 2008 R2.

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