|FreeTDS User Guide: A Guide to Installing, Configuring, and Running FreeTDS|
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Perhaps surprisingly, Kerberos can be used to authenticate to Microsoft SQL Servers.  This affords single-signon (or, at most, "double-signon") capability in non-Windows environment.
To take advantage of Kerberos you have to set up your machine with keytab  from your Active Directory. You could use Samba or configure Kerberos directly (/etc/krb5.conf). configure includes options to define the location of your Kerberos installation (cf. Options to configure).
By default UNIX does not initialize a Kerberos ticket with your login account. You must use kinit to initialize a ticket. You could also configure Kerberos in PAM to initialize a Kerberos ticket at login time.
It works because much of Active Directory is based on Kerberos. From each according to his ability; to each according to his needs.
No, the author does not really know what he's talking about.