---
name: "IPV6_DROP_MEMBERSHIP"
section: "2const"
platform: "linux"
package: "man-pages"
version: "6.19-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/IPV6_ADD_MEMBERSHIP"
---

# IPV6\_DROP\_MEMBERSHIP(2const)

join or leave a multicast group

Part of [IPV6\_ADD\_MEMBERSHIP(2const)](/IPV6_ADD_MEMBERSHIP/2const.md).

## NAME

IPV6\_ADD\_MEMBERSHIP, IPV6\_DROP\_MEMBERSHIP - join or leave a multicast group

## LIBRARY

Standard C library (*libc*, *-lc*)

## SYNOPSIS

```
#include <netinet/in.h>  /* Definition of IP* constants */
#include <sys/socket.h>
```

**int setsockopt(int** *sockfd***, IPPROTO\_IPV6, IPV6\_ADD\_MEMBERSHIP,**                **const struct ipv6\_mreq \****val***, sizeof(struct ipv6\_mreq));** **int setsockopt(int** *sockfd***, IPPROTO\_IPV6, IPV6\_DROP\_MEMBERSHIP,**                **const struct ipv6\_mreq \****val***, sizeof(struct ipv6\_mreq));**

## DESCRIPTION

Join or leave a multicast group.

See **IP\_ADD\_MULTICAST**(2const) and **IP\_DROP\_MULTICAST**(2const).

## ERRORS

See [**IPPROTO\_IPV6**(2const)](/IPPROTO_IPV6/2const.md). See [**setsockopt**(2)](/setsockopt/2.md). See [**ipv6**(7)](/ipv6/7.md).

## SEE ALSO

[**IPPROTO\_IPV6**(2const)](/IPPROTO_IPV6/2const.md), [**setsockopt**(2)](/setsockopt/2.md), [**ipv6**(7)](/ipv6/7.md)