diff --git a/Shorewall-common/firewall b/Shorewall-common/firewall
index e8a8364a5..b767a5cc7 100755
--- a/Shorewall-common/firewall
+++ b/Shorewall-common/firewall
@@ -378,11 +378,11 @@ stop_firewall() {
     done
 
     case "$IP_FORWARDING" in
-	On|on|ON)
+	On|on|ON|Yes|yes|YES)
 	    echo 1 > /proc/sys/net/ipv4/ip_forward
 	    progress_message2 "IP Forwarding Enabled"
 	    ;;
-	Off|off|OFF)
+	Off|off|OFF|No|no|NO)
 	    echo 0 > /proc/sys/net/ipv4/ip_forward
 	    progress_message2 "IP Forwarding Disabled!"
 	    ;;
diff --git a/Shorewall-common/lib.config b/Shorewall-common/lib.config
index 01d31c84c..6fd41f5ea 100644
--- a/Shorewall-common/lib.config
+++ b/Shorewall-common/lib.config
@@ -1853,7 +1853,7 @@ do_initialize() {
 
     if [ -n "$IP_FORWARDING" ]; then
 	case "$IP_FORWARDING" in
-	    On|Off|Keep|on|off|keep|ON|OFF|KEEP)
+	    On|Off|Yes|No|Keep|on|off|yes|no|keep|ON|OFF|YES|NO|KEEP)
 		;;
 	    *)
 		startup_error "Invalid value ($IP_FORWARDING) for IP_FORWARDING"