The atunload command does not unload the AppleTalk drivers. Reboot the system to unload the drivers.
In the NetWare realm, TAS sets the internal network number to the system's host ID by default. This network number cannot consist of all zeroes or contain greater than eight digits. If your host ID consists of all zeroes or contains greater than eight digits, change your network number to a unique number that conforms to these restrictions.
Patch 1968 improves TAS performance for IRIX 6.4. Patch 1990 improves TAS performance for IRIX 6.2. You can get these patches from your SGI representative.