[28277] in Kerberos
Re: Standard mechanisms to manage domain->realm mappings
daemon@ATHENA.MIT.EDU (Jeffrey Altman)
Thu Aug 16 10:04:28 2007
Message-ID: <46C459C8.4070808@secure-endpoints.com>
Date: Thu, 16 Aug 2007 10:06:00 -0400
From: Jeffrey Altman <jaltman@secure-endpoints.com>
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To: edward_newman@ml.com
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Newman, Edward (GTI) wrote:
> One additional comment on example below - having more than one realm
> within one DNS domain is likely to cause a lot of pain as you will not
> be able to use SRV records for KDC identification.=20
SRV records are used for location of the KDCs in a realm. Unless you
have two realms
with the same name (which won't interoperate) this will not be a problem.=
=20
Realm A.EXAMPLE.COM
a-kdc-1.example.com
a-kdc-2.example.com
Realm B.EXAMPLE.COM
b-kdc-1.example.com
b-kdc-2.example.com
SRV records are then created with the following names to represent those
KDCs.
_kerberos._udp.A.EXAMPLE.COM
_kerberos._tcp.A.EXAMPLE.COM
_kerberos._udp.B.EXAMPLE.COM
_kerberos._tcp.B.EXAMPLE.COM
This SRV records are independent of the domain name of the KDCs.
If you meant TXT records instead of SRV records, they can be set on a
per host basis.
Jeffrey Altman
>
> Jeffrey Altman wrote:
>
> The reason this is an issue is if your organization's domain is foo.com=
> and you have both a MIT realm and an AD realm where the hosts in the tw=
o
> realms both belonging to the foo.com domain. In this situation the
> organization must list each individual host that provides a service in
> the krb5.conf domain_realm section. As you add or remove hosts, you
> must update the krb5.conf files. This is exactly the reason why KDC
> referrals are so important for scalability.
>
> ___________________________________
> Edward Newman
> GTI A&E Identity & Naming Services
> Merrill Lynch, 9th Fl, 222 Broadway, New York, NY 10007, USA
> Phone : +1-212-670-1546 Cell: +1-917-975-2356
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