The following example odbc.ini file configures the 32-bit SQL Server Wire Protocol driver to use authentication, specifically Kerberos authentication. The examples contains the connection options necessary to configure Kerberos authentication as well as the minimum options required to establish a connection. 

Driver=ODBCHOME/lib/ivsqlsxx.so
Description=DataDirect SQL Server Wire Protocol
...
AuthenticationMethod=4
...
Database=Accounting
...
GSSClient=native
...
HostName=AccountingSQLSServer
...
PortNumber=1433
...
UID=JohnSmith
...