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Internet Connection Sharing and Internet Connection Firewall

Purpose

Internet Connection Sharing (ICS) makes it possible for home and small office users to share a single connection to the Internet. The Internet Connection Firewall (ICF) protects connections on which it is running from unsolicited network traffic. The ICS/ICF API makes it possible to programmatically manage the features of ICS/ICF, making it possible to create, enable, and disable ICS or ICF port-mappings on a network connection.

Where applicable

The ICS/ICF API is intended for situations in which a software application or setup program needs to make adjustments to the configuration of the home networking environment in which it runs. For example, a service that is connected to the Internet through a local Network Address Translator (NAT) and that needs to receive unsolicited traffic can create port mappings on that NAT through the NAT traversal API.

Another example would be: An application that provides advanced firewall or NAT capabilities can use the ICS/ICF API to disable ICS on specific connections with a user's permission.

ICS is available for use in the operating systems specified in the Requirements section. It may be altered or unavailable in subsequent versions. ICF will be altered or unavailable in subsequent versions. Instead, use the Windows Firewall API.

Developer audience

The ICS/ICF API is designed for use by programmers using C/C++, Microsoft Visual Basic development system, Visual Basic Scripting Edition, and JScript development software. Programmers should be familiar with networking concepts such as stateful packet filtering and network address translation (NAT).

Run-time requirements

The ICS/ICF API is supported on Windows XP.

In this section

TopicDescription

Overview

General information about Internet Connection Sharing and Internet Connection Firewall.

Reference

Documentation for Internet Connection Sharing and Internet Connection Firewall interfaces, structures, and other code elements.

Samples

Sample code that demonstrates how to use Internet Connection Sharing and Internet Connection Firewall interfaces.

 

Related topics

Routing and Remote Access Service
Windows Firewall

 

 

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