The freetds/DBD::Sybase should work, though I don't know how far the freetds project has come to implement the protocol.

Another approach might be to use ODBC on Linux and DBD::ODBC.
I know, there are several implementations of ODBC in Linux, but I don't know any by name.

Update: Have a look at the documentation of DBD::ODBC, Your question may be answered there.

In reply to Re: ODBC from Linux to Windows 2000 / MSSQL by busunsl
in thread ODBC from Linux to Windows 2000 / MSSQL by snowcrash

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