diff --git a/patches/openwrt/0027-odhcp6c-minor-fixes.patch b/patches/openwrt/0027-odhcp6c-minor-fixes.patch
new file mode 100644
index 00000000..2b0a56b8
--- /dev/null
+++ b/patches/openwrt/0027-odhcp6c-minor-fixes.patch
@@ -0,0 +1,77 @@
+From: Nils Schneider <nils@nilsschneider.net>
+Date: Thu, 3 Sep 2015 18:07:17 +0200
+Subject: odhcp6c: minor fixes
+
+Better synchronize RA & DHCPv6 events
+Accumulate some events to avoid flooding
+Restart softwires for address and prefix changes
+
+Signed-off-by: Steven Barth <steven@midlink.org>
+
+diff --git a/package/network/ipv6/odhcp6c/Makefile b/package/network/ipv6/odhcp6c/Makefile
+index 75de54c..aa81e02 100644
+--- a/package/network/ipv6/odhcp6c/Makefile
++++ b/package/network/ipv6/odhcp6c/Makefile
+@@ -8,14 +8,14 @@
+ include $(TOPDIR)/rules.mk
+ 
+ PKG_NAME:=odhcp6c
+-PKG_VERSION:=2015-07-18
++PKG_VERSION:=2015-07-29
+ PKG_RELEASE=$(PKG_SOURCE_VERSION)
+ 
+ PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.bz2
+ PKG_SOURCE_SUBDIR:=$(PKG_NAME)-$(PKG_VERSION)
+ PKG_SOURCE_URL:=https://github.com/sbyx/odhcp6c.git
+ PKG_SOURCE_PROTO:=git
+-PKG_SOURCE_VERSION:=024525798c5f6aba3af9b2ef7b3af2f3c14f1db8
++PKG_SOURCE_VERSION:=dc186d6d2b0dd4ad23ca5fc69c00e81f796ff6d9
+ PKG_MAINTAINER:=Steven Barth <steven@midlink.org>
+ PKG_LICENSE:=GPL-2.0
+ 
+diff --git a/package/network/ipv6/odhcp6c/files/dhcpv6.script b/package/network/ipv6/odhcp6c/files/dhcpv6.script
+index 33f6d9b..677d35f 100755
+--- a/package/network/ipv6/odhcp6c/files/dhcpv6.script
++++ b/package/network/ipv6/odhcp6c/files/dhcpv6.script
+@@ -5,6 +5,8 @@
+ 
+ setup_interface () {
+ 	local device="$1"
++	local prefsig=""
++	local addrsig=""
+ 	proto_init_update "*" 1
+ 
+ 	# Merge RA-DNS
+@@ -34,6 +36,7 @@ setup_interface () {
+ 
+ 	for prefix in $PREFIXES; do
+ 		proto_add_ipv6_prefix "$prefix"
++		prefsig="$prefsig ${prefix%%,*}"
+ 		local entry="${prefix#*/}"
+ 		entry="${entry#*,}"
+ 		entry="${entry#*,}"
+@@ -68,6 +71,7 @@ setup_interface () {
+ 		local valid="${entry%%,*}"
+ 
+ 		proto_add_ipv6_address "$addr" "$mask" "$preferred" "$valid" 1
++		addrsig="$addrsig $addr/$mask"
+ 
+ 		if [ -z "$RA_ADDRESSES" -a -z "$RA_ROUTES" -a \
+ 				-z "$RA_DNS" -a "$FAKE_ROUTES" = 1 ]; then
+@@ -136,6 +140,8 @@ setup_interface () {
+ 		json_add_string ifname "@$INTERFACE"
+ 		json_add_string proto map
+ 		json_add_string type "$MAPTYPE"
++		json_add_string _prefsig "$prefsig"
++		[ "$MAPTYPE" = lw4o6 ] && json_add_string _addrsig "$addrsig"
+ 		json_add_string rule "$MAPRULE"
+ 		json_add_string tunlink "$INTERFACE"
+ 		[ -n "$ZONE_MAP" ] || ZONE_MAP=$ZONE
+@@ -163,6 +169,7 @@ setup_interface () {
+ 		json_add_string ifname "@$INTERFACE"
+ 		json_add_string proto "464xlat"
+ 		json_add_string tunlink "$INTERFACE"
++		json_add_string _addrsig "$addrsig"
+ 		[ -n "$ZONE_464XLAT" ] || ZONE_464XLAT=$ZONE
+ 		[ -n "$ZONE_464XLAT" ] && json_add_string zone "$ZONE_464XLAT"
+ 		[ -n "$IFACE_464XLAT_DELEGATE" ] && json_add_boolean delegate "$IFACE_464XLAT_DELEGATE"