diff -ruN src.orig/etc/defaults/rc.conf src/etc/defaults/rc.conf
--- src.orig/etc/defaults/rc.conf	2011-05-20 14:19:34.341476080 +0900
+++ src/etc/defaults/rc.conf	2011-05-20 14:18:23.927534426 +0900
@@ -494,6 +494,7 @@
 stf_interface_ipv6_ifid="0:0:0:1"	# IPv6 interface id for stf0.
 				# If you like, you can set "AUTO" for this.
 stf_interface_ipv6_slaid="0000"	# IPv6 Site Level Aggregator for stf0
+stf_interface_mode="anycast"	# Anycast router or edge router
 ipv6_faith_prefix="NO"		# Set faith prefix to enable a FAITH
 				# IPv6-to-IPv4 TCP translator.  You also need
 				# faithd(8) setup.
diff -ruN src.orig/etc/network.subr src/etc/network.subr
--- src.orig/etc/network.subr	2011-05-20 14:19:50.528201421 +0900
+++ src/etc/network.subr	2011-05-20 14:17:59.467935221 +0900
@@ -1042,6 +1042,14 @@
 		route add -inet6 2002:7f00:: -prefixlen 24 ::1 -reject
 		route add -inet6 2002:0000:: -prefixlen 24 ::1 -reject
 		route add -inet6 2002:ff00:: -prefixlen 24 ::1 -reject
+		case ${stf_interface_mode} in
+		[Aa][Nn][Yy][Cc][Aa][Ss][Tt])
+			;;
+		[Ee][Dd][Gg][Ee])
+			route -q del -inet6 2002:${ipv4_in_hexformat}::/${stf_prefixlen}
+			route -q del -inet6 2002::/${stf_prefixlen}
+			;;
+			esac
 		;;
 	esac
 }
diff -ruN src.orig/sys/net/if_stf.c src/sys/net/if_stf.c
--- src.orig/sys/net/if_stf.c	2011-05-20 14:20:08.610057217 +0900
+++ src/sys/net/if_stf.c	2011-05-20 14:19:12.535445653 +0900
@@ -479,11 +479,18 @@
 	/*
 	 * Pickup the right outer dst addr from the list of candidates.
 	 * ip6_dst has priority as it may be able to give us shorter IPv4 hops.
+	 *
+	 * NOTICE: dst is computed by routing tables and network prefix.
+	 * In broadcast segment, ip6->ip6_dst and dst6->sin6_addr are same.
+	 * Othersise, dst is found from routeing table.
 	 */
 	ptr = NULL;
+/*
 	if (IN6_IS_ADDR_6TO4(&ip6->ip6_dst))
 		ptr = GET_V4(&ip6->ip6_dst);
-	else if (IN6_IS_ADDR_6TO4(&dst6->sin6_addr))
+	else
+*/
+	if (IN6_IS_ADDR_6TO4(&dst6->sin6_addr))
 		ptr = GET_V4(&dst6->sin6_addr);
 	else {
 		ifa_free(&ia6->ia_ifa);