diff --git a/net/isc-dhcp/Makefile b/net/isc-dhcp/Makefile
index ed4ca7052a..63087d3e13 100644
--- a/net/isc-dhcp/Makefile
+++ b/net/isc-dhcp/Makefile
@@ -10,7 +10,7 @@ include $(TOPDIR)/rules.mk
 PKG_NAME:=isc-dhcp
 UPSTREAM_NAME:=dhcp
 PKG_VERSION:=4.4.0
-PKG_RELEASE:=3
+PKG_RELEASE:=4
 
 PKG_LICENSE:=BSD-3-Clause
 PKG_LICENSE_FILES:=LICENSE
diff --git a/net/isc-dhcp/files/dhcrelay.conf b/net/isc-dhcp/files/dhcrelay.conf
index b3b53b5167..8d3ddfe1c8 100644
--- a/net/isc-dhcp/files/dhcrelay.conf
+++ b/net/isc-dhcp/files/dhcrelay.conf
@@ -7,6 +7,8 @@ config dhcrelay ipv4
 
 	# network interfaces to listen on (e.g. lan or wan)
 	option 'interfaces' ''
+	option 'upstream_interfaces' ''
+	option 'downstream_interfaces' ''
 
 	# What to do about packets that already have a relay option:
 	# 'append': Forward and append our own relay option
diff --git a/net/isc-dhcp/files/dhcrelay4.init b/net/isc-dhcp/files/dhcrelay4.init
index 64d82281ef..0f401a5ca8 100644
--- a/net/isc-dhcp/files/dhcrelay4.init
+++ b/net/isc-dhcp/files/dhcrelay4.init
@@ -25,6 +25,18 @@ start() {
 			append args "-i $ifname"
 		fi
 	done
+	config_get interfaces ipv4 upstream_interfaces
+	for net in $interfaces; do
+		if network_get_device ifname "$net"; then
+			append args "-iu $ifname"
+		fi
+	done
+	config_get interfaces ipv4 downstream_interfaces
+	for net in $interfaces; do
+		if network_get_device ifname "$net"; then
+			append args "-id $ifname"
+		fi
+	done
 
 	# link selection sub-option (RFC3527)
 	local link_selection