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net: add note about disabling loopback in ListenMulticastUDP()

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Fixes #41752

Change-Id: I83520d2303e5fd2e5f6329f092b40e73c13771a1
Reviewed-on: https://go-review.googlesource.com/c/go/+/271908
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Dmitri Shuralyov <dmitshur@golang.org>
This commit is contained in:
Andy Pan 2020-11-21 14:48:26 +08:00 • committed by Ian Lance Taylor
parent 7b192f33cf
commit 4f42a9b76b
1 changed files with 3 additions and 0 deletions
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3
src/net/udpsock.go
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@ -259,6 +259,9 @@ func ListenUDP(network string, laddr *UDPAddr) (*UDPConn, error) {
// ListenMulticastUDP is just for convenience of simple, small
// applications. There are golang.org/x/net/ipv4 and
// golang.org/x/net/ipv6 packages for general purpose uses.
//
// Note that ListenMulticastUDP will set the IP_MULTICAST_LOOP socket option
// to 0 under IPPROTO_IP, to disable loopback of multicast packets.
func ListenMulticastUDP(network string, ifi *Interface, gaddr *UDPAddr) (*UDPConn, error) {
switch network {
case "udp", "udp4", "udp6":