If it is PPP/SLIP - yes, packet filters set up to only allow connection to
the permited ports.
If it is a shell user - no, you need to configure their shell accounts to
only allow access to what you want.
-MZ
-- Livingston Enterprises Technical Support Phone: 800-458-9966 FAX: 510-426-8951 support@livingston.com <http://www.livingston.com/> 6920 Koll Center Parkway #220, Pleasanton, CA 94566