switch runtime.GOOS {
case "darwin":
case "linux":
    log.Println("you may need to adjust the net.ipv4.ping_group_range kernel state")
default:
    log.Println("not supported on", runtime.GOOS)
    return
}

c, err := icmp.ListenPacket("udp6", "fe80::1%en0")
if err != nil {
    log.Fatal(err)
}
defer c.Close()

wm := icmp.Message{
    Type: ipv6.ICMPTypeEchoRequest, Code: 0,
    Body: &icmp.Echo{
        ID: os.Getpid() & 0xffff, Seq: 1,
        Data: []byte("HELLO-R-U-THERE"),
    },
}
wb, err := wm.Marshal(nil)
if err != nil {
    log.Fatal(err)
}
if _, err := c.WriteTo(wb, &net.UDPAddr{IP: net.ParseIP("ff02::1"), Zone: "en0"}); err != nil {
    log.Fatal(err)
}

rb := make([]byte, 1500)
n, peer, err := c.ReadFrom(rb)
if err != nil {
    log.Fatal(err)
}
rm, err := icmp.ParseMessage(58, rb[:n])
if err != nil {
    log.Fatal(err)
}
switch rm.Type {
case ipv6.ICMPTypeEchoReply:
    log.Printf("got reflection from %v", peer)
default:
    log.Printf("got %+v; want echo reply", rm)
}

2019/04/02 20:41:11 got &{Type:echo request Code:0 Checksum:10393 Body:0xc00008ea20}; want echo reply

switch rm.Type {
case ipv6.ICMPTypeEchoReply:
    log.Printf("got reflection from %v", peer)
default:
    log.Printf("got %+v; want echo reply", rm)
}

switch rm.Type {
case ipv6.ICMPTypeEchoRequest:
    log.Printf("got reflection from %v", peer)
default:
    log.Printf("got %+v; want echo reply", rm)
}