Microsoft Internet Security and Acceleration Server 2004 SDK

IFWXIpFilter

The IFWXIpFilter interface is the application filter interface that represents an IP filter, which is a range of IP addresses for which a connection or socket is allowed to function. Use this interface to ensure that secondary and emulated connections are secure.

Methods in Vtable Order

The IFWXIpFilter interface inherits the methods of the standard COM interface IUnknown.

In addition, IFWXIpFilter defines the following methods.

Method	Description
IncludeRange	Includes a range of IP addresses in the IP filter.
ExcludeRange	Excludes a range of IP addresses from the IP filter.
IncludeFilter	Includes in the IP filter a range of IP addresses represented by an existing IP filter.
ExcludeFilter	Excludes from the IP filter a range of IP addresses represented by an existing IP filter.
IsIncluded	Checks if a particular IP address is included in the ranges of those allowed by the IP filter.
Compare	Compares the IP ranges of two IP filters.
Clone	Returns a copy of an IP filter. The copy will contain the same ranges of IP addresses as the original.

Remarks

There are situations in which an application filter is responsible for limiting what IP addresses are allowed access, including:

The case of a secondary inbound connection, as occurs in use of the FTP protocol. Use the IFWXIpFilter interface in the FTP scenario to restrict the access to the inbound socket of the secondary connection. For example, an FTP application filter opens a secondary connection with a range that includes only the IP address of the FTP server. All IP packets with a source address that is not the IP address of the FTP server will be rejected by the packet filter driver if they are addressed to the socket that the FTP application filter created for the secondary connection.
The case of a secondary or emulated connection in a publishing scenario.

For security purposes, the application filter has to define an IP filter, which is a range of IP addresses for which a particular connection or socket is allowed. The IFWXIpFilter interface is where you define that range of IP addresses.

Note If you set the range of IP addresses equal to NULL, you are allowing all addresses to connect.

Requirements

Server: Requires Windows Server 2003 or Windows 2000.
Version: Requires Internet Security and Acceleration Server 2004.
Header: Declared in Wspfwext.idl.

IFWXIpFilter

Methods in Vtable Order

Remarks

Requirements

See Also