IPPROTO_IP (Windows Embedded CE 6.0)

1/6/2010

The following table describes IPPROTO_IP Socket Options. See the getsockopt and setsockopt function reference pages for more information on getting and setting socket options. To enumerate protocols and discover supported properties for each installed protocol, use the WSAEnumProtocols function.

Note

These values are defined in Ws2tcpip.h. You must include this header for applications that call getsockopt or setsockopt on Windows Embedded CE-based devices.

Some socket options require more explanation than these tables can convey; such options contain links to additional pages.

IPPROTO_IP

Option get/set Optval type Description

IP_ADD_MEMBERSHIP

set

struct ip_mreq

Joins the socket to multicast group on the specified interface.

IP_DROP_MEMBERSHIP

set

struct ip_mreq

Leaves the specified multicast group from the specified interface. Service providers must support this option when multicast is supported. Support is indicated in the WSAPROTOCOL_INFO structure returned by a WSAEnumProtocols function call with the following: XPI_SUPORTS_MULTIPOINT=1, XP1_MULTIPOINT_CONTROL_PLANE=0, XP1_MULTIPOINT_DATA_PLANE=0.

IP_MULTICAST_IF

both

DWORD

Sets the outgoing (IPv4) interface for multicast traffic. Important for multihomed machines. The input value is the 4-byte network byte order IPv4 address. If optval is null, the default interface is used.

IP_MULTICAST_TTL

both

DWORD

Sets/gets the TTL value associated with IP multicast traffic on the socket.

IP_MULTICAST_LOOP

get

DWORD

Default value is TRUE. When TRUE, data that is sent from the local interface to the multicast group to which the socket is joined, including data sent from the same socket, will be echoed to its receive buffer.

See Also

Concepts

Socket Options