diff --git a/sbin/ifconfig/ifconfig.8 b/sbin/ifconfig/ifconfig.8
--- a/sbin/ifconfig/ifconfig.8
+++ b/sbin/ifconfig/ifconfig.8
@@ -502,6 +502,10 @@
 extra console error logging.
 .It Fl debug
 Disable driver dependent debugging code.
+.It Cm allmulti
+Enable promiscuous mode for multicast packets.
+.It Fl allmulti
+Disable promiscuous mode for multicast packets.
 .It Cm promisc
 Put interface into permanently promiscuous mode.
 .It Fl promisc
diff --git a/sbin/ifconfig/ifconfig.c b/sbin/ifconfig/ifconfig.c
--- a/sbin/ifconfig/ifconfig.c
+++ b/sbin/ifconfig/ifconfig.c
@@ -2078,6 +2078,8 @@
 	DEF_CMD_ARG("descr",			setifdescr),
 	DEF_CMD("-description",	0,		unsetifdescr),
 	DEF_CMD("-descr",	0,		unsetifdescr),
+	DEF_CMD("allmulti",	IFF_ALLMULTI,	setifflags),
+	DEF_CMD("-allmulti",	IFF_ALLMULTI,	clearifflags),
 	DEF_CMD("promisc",	IFF_PPROMISC,	setifflags),
 	DEF_CMD("-promisc",	IFF_PPROMISC,	clearifflags),
 	DEF_CMD("add",		IFF_UP,		notealias),