FreeTDS Development Group

["Lowden, James K" <LowdenJK AT bernstein.com>]

> From: Steve Murphree [mailto:smurph AT smcomp.com]
> Sent: July 30, 2003 7:30 PM
> 
> When setting up a DSN you either have to provide a
> port number or a 'Server Alias' and determine the port 
> dynamicly.  If you
> are specifying a port, you will get whatever instance is 
> there.  If you are
> determining the port dynamicly, the driver setup tries a 
> 'Server Alias'
> (instance) -> port match against a port range (not sure what 
> this range is)
> on the server and failing that, uses port 1433.  The default 
> instance can be a MSSQL v6.5, v7, or a 2k server.  

The attached message came from Daniel Morgan on 5 February and includes C#
code that appears to send a UPD message to port 1434 to discover the port
for a named instance.  That behavior conforms to Microsoft's description:

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/architec/8_
ar_cs_9okz.asp

Why do you say the driver blindly attempts to connect to a range of ports?  

I've been ignoring named instances because they looked like nothing more
than an extra entry in freetds.conf.  From your description of the ODBC API,
it sounds like we really need to implement the discovery protocol if we're
going to support them properly.  Would you agree?  

--jkl

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