See Also
 Important: |
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| This is retired content. This content is outdated and is no longer being maintained. It is provided as a courtesy for individuals who are still using these technologies. This content may contain URLs that were valid when originally published, but now link to sites or pages that no longer exist. |
The following table describes IPPROTO_IP socket options. See the getsockoptand setsockoptfunction reference pages for more information on getting and setting socket options. To enumerate protocols and discover supported properties for each installed protocol, use the WSAEnumProtocolsfunction.
 Note: |
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| These values are defined in Ws2tcpip.h. You must include this header for applications that call getsockoptor setsockopton Windows Embedded CE-based devices. |
Some socket options require more explanation than these tables can convey; such options contain links to additional pages.
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Important: |
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| If you implement the IP_HDRINCL option to support the raw sockets protocol, you must first call the bindfunction on the socket before attempting the setsockoptcall. |
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. |
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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_INFOstructure returned by a WSAEnumProtocols function call with the following: XPI_SUPORTS_MULTIPOINT=1, XP1_MULTIPOINT_CONTROL_PLANE=0, XP1_MULTIPOINT_DATA_PLANE=0. |
|
IP_DSCP_TRAFFIC_TYPE |
set |
Struct ip_mreg |
For a call to WSPSetSockOptwith the level set to IPPROTYPE_IP specifies the requested traffic type with the following: DSCPTypeNotSet=0DSCPBestEffort=1,DSCPBackground=2 DSCPExcellentEffort=3DSCPVideo=4DSCPAudio=5DSCPControl=6 |
|
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. |
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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. |