diff --git a/etc/defaults/rc.conf b/etc/defaults/rc.conf
index 8a6b789c8edb..4be722667a17 100644
--- a/etc/defaults/rc.conf
+++ b/etc/defaults/rc.conf
@@ -282,6 +282,7 @@ ipv6_router_flags=""		# Flags to IPv6 routing daemon.
 ipv6_default_interface="NO"	# Default output interface for scoped addrs.
 				# Now this works only for IPv6 link local
 				# multicast addrs.
+rtsol_flags=""			# Flags to IPv6 router solicitation.
 rtadvd_enable="NO"		# Set to YES to enable an IPv6 router
 				# advertisement daemon. If set to YES,
 				# this router becomes a possible candidate
diff --git a/etc/network.subr b/etc/network.subr
index d9512246ba8d..7b7c6527a0c1 100644
--- a/etc/network.subr
+++ b/etc/network.subr
@@ -407,7 +407,7 @@ network6_interface_setup()
 		sysctl net.inet6.ip6.accept_rtadv=1
 		set ${rtsol_interfaces}
 		ifconfig $1 up
-		rtsol $1
+		rtsol ${rtsol_flags} $1
 	fi
 
 	for i in $interfaces; do