Is this a security risk?

Many users express surprise to find that the File and Print sharing for Microsoft Networks component becomes enabled when adding the EnterNet software. This is actually enabled by Windows when the ethernet or DSL adapter is added. When EnterNet is installed, these services will also bind over the EnterNet adapter (as they will over any adapter).

This is usually not as serious a security risk as one would think, since the NetBIOS and SMB packets that comprise the File sharing are normally discarded by your network routers. They are a concern for performance reasons, and if possible should be removed for that reason. How to do this?

From your Control Panel -> Networks, verify that the service "File and Printer Sharing for Microsoft Networks" is not configured. If it is, remove it. If you require this service (for sharing over a second ethernet card), Select the TCP/IP -> Network TeleSystems. PPPoE Adapter, click Properties, and uncheck any services in the Bindings tab.

For Windows98 systems, you may want to consider replacing the "Client for Microsoft Networks" with the "Windows Family Login" client. This will prevent unnecessary broadcasts over the ethernet card.