The network driver specifies the name of the Net-Library driver to use for the connection. The driver name must correspond to a valid entry in the library (libtcl.cfg) file, which is located in the ini subdirectory of the Sybase installation directory.
The following example shows three driver entries in a libtcl.cfg file:
NLMSNMP=NLMSNMP Named Pipes Driver NLWNSCK=NLWNSCK WinSock TCP/IP Driver NLNWLINK=NLNWLINK NWLink SPX/IPX Driver
As drivers are added or removed, you can edit the libtcl.cfg file with a text editor or with the ocscfg.exe utility, located in the bin subdirectory of the Sybase installation directory.