diff --git a/src/packages/fff/fff-hoods/Makefile b/src/packages/fff/fff-hoods/Makefile
index c17d807d..58ca1901 100644
--- a/src/packages/fff/fff-hoods/Makefile
+++ b/src/packages/fff/fff-hoods/Makefile
@@ -1,7 +1,7 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=fff-hoods
-PKG_RELEASE:=17
+PKG_RELEASE:=18
 
 PKG_BUILD_DIR:=$(BUILD_DIR)/$(PKG_NAME)
 
diff --git a/src/packages/fff/fff-hoods/files/usr/sbin/configurehood b/src/packages/fff/fff-hoods/files/usr/sbin/configurehood
index 1e6745f0..2dab76f5 100755
--- a/src/packages/fff/fff-hoods/files/usr/sbin/configurehood
+++ b/src/packages/fff/fff-hoods/files/usr/sbin/configurehood
@@ -190,6 +190,14 @@ if [ -s "$hoodfiletmp" ]; then
 	# Set $prefix::MAC as IP
 	if [ -n "$prefix" ] ; then
 		prefix="$(echo "$prefix" | sed -e 's,\\,,')"
+
+		# in earlier firmware versions the prefix had to be written
+		# in an incorrect syntax (missing a trailing colon).
+		# To make hoodfiles with this old incorrect syntax work with
+		# newer firmware versions like this one, we have to fix the
+		# incorrect syntax here.
+		prefix="$(echo "$prefix" | sed -e 's,\([^:]\):\/,\1::/,')"
+
 		mac="$(cat "/sys/class/net/br-client/address")"
 		addr="$(ipMacAssemble "$prefix" "$mac")"
 		addr="$(ipTidyColon "$addr")"
diff --git a/src/packages/fff/fff-network/Makefile b/src/packages/fff/fff-network/Makefile
index 8d67824d..0122a9ab 100644
--- a/src/packages/fff/fff-network/Makefile
+++ b/src/packages/fff/fff-network/Makefile
@@ -1,7 +1,7 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=fff-network
-PKG_RELEASE:=26
+PKG_RELEASE:=27
 
 PKG_BUILD_DIR:=$(BUILD_DIR)/$(PKG_NAME)
 
diff --git a/src/packages/fff/fff-network/files/lib/functions/fff/network b/src/packages/fff/fff-network/files/lib/functions/fff/network
index 06a6a84d..ebefc107 100644
--- a/src/packages/fff/fff-network/files/lib/functions/fff/network
+++ b/src/packages/fff/fff-network/files/lib/functions/fff/network
@@ -2,7 +2,7 @@
 # License GPLv3
 
 ipMacSuffix() {
-	# Returns the lower 64 bits of an IPv6 address (0:aabb:ccdd:eeff)
+	# Returns the lower 64 bits of an IPv6 address (::aabb:ccdd:eeff)
 	# based on the provided MAC address (aa:bb:cc:bb:ee:ff)
 	#
 	# Argument: MAC address (with colons)
@@ -11,12 +11,12 @@ ipMacSuffix() {
 
 	local mac=$1
 
-	echo "$mac" | awk -F: '{ print "0:"$1$2":"$3$4":"$5$6 }'
+	echo "$mac" | awk -F: '{ print "::"$1$2":"$3$4":"$5$6 }'
 	return 0
 }
 
 ipEUISuffix() {
-	# Returns the EUI (interface ID, a8bb:ccff:fedd:eeff)
+	# Returns the EUI (interface ID, ::a8bb:ccff:fedd:eeff)
 	# based on the provided MAC address (aa:bb:cc:bb:ee:ff)
 	#
 	# Argument: MAC address (with colons)
@@ -25,21 +25,40 @@ ipEUISuffix() {
 
 	local mac=$1
 
-	echo "$mac" | awk -F: '{ printf("%02x%s:%sff:fe%s:%s%s\n", xor(("0x"$1),2), $2, $3, $4, $5, $6) }'
+	echo "$mac" | awk -F: '{ printf("::%02x%s:%sff:fe%s:%s%s\n", xor(("0x"$1),2), $2, $3, $4, $5, $6) }'
 	return 0
 }
 
 ipAssemble() {
 	# Concatenates a prefix (1st argument) and a suffix (2nd argument) to a merged IPv6 address
 	# (The prefix has to bear the subnet: fdff::/64)
-	# (The prefix must only contain the higher 64 bits (correct: 0:0:0:0: or 0:: - wrong: 0:0:0:0::)
+	# (The prefix must only contain the upper 64 bits (0:0:0:0:: or 0::)
+	# (The suffix must only contain the lower 64 bits (::0:0:0:0 or ::0)
 
 	[ $# -ne "2" ] && return 1
 
 	local prefix=$1
-	local suffix=$2
+	local suffix
+	local result
+
+	# remove leading colons
+	suffix=$(echo "$2" | sed -e 's,^:*,,')
+
+	# check if prefix contains the mandatory trailing double-colon
+	if ! echo "$prefix" | grep "::/" >/dev/null; then
+		return 1
+	fi
+
+	# concatenate prefix and suffix
+	result=$(echo "$prefix" | sed -e "s,/,$suffix/,")
+
+	# remove double-colon if both prefix and suffix are fully expanded
+	if [ "$(echo "$result" | awk -F":" '{print NF-1}')" -gt 7 ]; then
+		result=$(echo "$result" | sed -e 's,::,:,')
+	fi
+
+	echo "$result"
 
-	echo "$prefix" | sed -e 's,/,'$suffix'/,'
 	return 0
 }
 
diff --git a/src/packages/fff/fff-network/files/usr/sbin/configurenetwork b/src/packages/fff/fff-network/files/usr/sbin/configurenetwork
index d683e7da..7ab74e24 100755
--- a/src/packages/fff/fff-network/files/usr/sbin/configurenetwork
+++ b/src/packages/fff/fff-network/files/usr/sbin/configurenetwork
@@ -207,7 +207,7 @@ else
     uci -q set network.client.proto=static
 
     # Set $prefix::1 as IP
-    addr="$(ipAssemble "$prefix" "1")"
+    addr="$(ipAssemble "$prefix" "::1")"
     ip -6 addr add $addr dev br-client
     uci -q add_list network.client.ip6addr=$addr