diff --git a/Shorewall-common/swping b/Shorewall-common/swping
index 35f4f0e83..ac7e1c4f4 100644
--- a/Shorewall-common/swping
+++ b/Shorewall-common/swping
@@ -27,30 +27,30 @@
 #
 FAMILY=4
 #
-# The commands to run when the status of a line changes. Both commands will be executed.
+# The command to run when the status of a line changes. Can include multiple commands
+# separated by semicolons (";").
 #
-COMMANDA=
-COMMANDB="ip -$FAMILY route ls"
+COMMAND=
 
 if [ $FAMILY -eq 4 ]; then
     if [ -f /usr/share/shorewall-lite/lib.base ]; then
 	. /usr/share/shorewall-lite/lib.base
 	[ -f /etc/shorewall-lite/params ] && . /etc/shorewall-lite/params
-	[ -n "${COMMANDA:="/sbin/shorewall-lite restart"}" ]
+	[ -n "${COMMAND:="/sbin/shorewall-lite restart; /sbin/ip -4 route ls"}" ]
     elif [ -f /usr/share/shorewall/lib.base ]; then
 	. /usr/share/shorewall/lib.base
 	[ -f /etc/shorewall/params ] && . /etc/shorewall/params
-	[ -n "${COMMANDA:="/sbin/shorewall restart -f"}" ]
+	[ -n "${COMMAND:="/sbin/shorewall restart -f; /sbin/ip -4 route ls"}" ]
     fi
 else
     if [ -f /usr/share/shorewall6-lite/lib.base ]; then
 	. /usr/share/shorewall6-lite/lib.base
 	[ -f /etc/shorewall6-lite/params ] && . /etc/shorewall6-lite/params
-	[ -n "${COMMANDA:="/sbin/shorewall6-lite restart"}" ]
+	[ -n "${COMMAND:="/sbin/shorewall6-lite restart; /sbin/ip -4 route ls"}" ]
     elif [ -f /usr/share/shorewall6/lib.base ]; then
 	. /usr/share/shorewal6l/lib.base
 	[ -f /etc/shorewall6/params ] && . /etc/shorewall6/params
-	[ -n "${COMMANDA:="/sbin/shorewall6 restart -f"}" ]
+	[ -n "${COMMAND:="/sbin/shorewall6 restart -f; /sbin/ip -4 route ls"}" ]
     fi
 fi
 #
@@ -59,7 +59,9 @@ fi
 IF1=eth0
 IF2=eth1
 #
-# Sites to Ping. Must depend only on routes in the 'main' routing table.
+# Sites to Ping. Must depend only on routes in the 'main' routing table. If not specified,
+# the interface is assumed to be managed by dhcpcd and the script uses the gateway address
+# from /var/lib/dhcpcd/dhcpcd-${IFx}.info
 #
 TARGET1=xxx.xxx.xxx.xxx
 TARGET2=yyy.yyy.yyy.yyy
@@ -100,6 +102,19 @@ count1=0
 count2=0
 
 [ $FAMILY -eq 4 ] && ping=ping || ping=ping6
+#################################################################################################
+# Determine the GATEWAY of a DHCP interface
+#################################################################################################
+get_target() {
+
+    local GATEWAYS
+    GATEWAYS=
+
+    if [ -f /var/lib/dhcpcd/dhcpcd-${1}.info ]; then
+	eval $(grep ^GATEWAYS=  /var/lib/dhcpcd/dhcpcd-${1}.info 2> /dev/null)
+	[ -n "$GATEWAYS" ] && GATEWAYS=${GATEWAYS%,*} && echo $GATEWAYS
+    fi
+}
 #
 # Script starts here
 #
@@ -107,7 +122,15 @@ rm -f $STATEDIR/${IF1}.status
 rm -f $STATEDIR/${IF2}.status
 
 while : ; do
-    $ping -n -W $PING_TIMEOUT -I $IF1 -c 1 $TARGET1 > /dev/null 2>&1 && current_if1_ping=0 || current_if1_ping=1
+    target=$TARGET1
+
+    [ -n "$target" ] || target=$(get_target $IF1)
+
+    if [ -n "$target" ]; then
+	$ping -n -W $PING_TIMEOUT -I $IF1 -c 1 $target > /dev/null 2>&1 && current_if1_ping=0 || current_if1_ping=1
+    else
+	current_if1_ping=1
+    fi
 
     if [ $current_if1_ping -ne $last_if1_ping ]; then
 	last_if1_ping=$current_if1_ping
@@ -141,7 +164,15 @@ while : ; do
 	    ;;
     esac
 
-    $ping -n -W $PING_TIMEOUT -I $IF2 -c 1 $TARGET2 > /dev/null 2>&1 && current_if2_ping=0 || current_if2_ping=1
+    target=$TARGET2
+
+    [ -n "$target" ] || target=$(get_target $IF2)
+
+    if [ -n "$target" ]; then
+	$ping -n -W $PING_TIMEOUT -I $IF2 -c 1 $target > /dev/null 2>&1 && current_if2_ping=0 || current_if2_ping=1
+    else
+	current_if2_ping=1
+    fi
 
     if [ $current_if2_ping -ne $last_if2_ping ]; then
 	last_if2_ping=$current_if2_ping
@@ -181,8 +212,7 @@ while : ; do
 	#
 	echo $if1_state > /etc/shorewall/${IF1}.status
 	echo $if2_state > /etc/shorewall/${IF2}.status 
-	$COMMANDA
-	$COMMANDB
+	eval $COMMAND
 	state_changed=
     fi
 
diff --git a/Shorewall-perl/Shorewall/Providers.pm b/Shorewall-perl/Shorewall/Providers.pm
index a473fb4c3..a8242932b 100644
--- a/Shorewall-perl/Shorewall/Providers.pm
+++ b/Shorewall-perl/Shorewall/Providers.pm
@@ -263,7 +263,6 @@ sub add_a_provider( $$$$$$$$ ) {
     my $base     = uc chain_base $interface;
 
     if ( $gateway eq 'detect' ) {
-	fatal_error "'detect' is not allowed with USE_DEFAULT_RT=Yes" if $config{USE_DEFAULT_RT};
 	fatal_error "Configuring multiple providers through one interface requires an explicit gateway" if $shared;
 	$gateway = get_interface_gateway $interface;
 	start_provider( $table, $number, qq(if interface_is_usable $interface && [ -n "$gateway" ]; then) );
@@ -427,7 +426,7 @@ sub add_a_provider( $$$$$$$$ ) {
     if ( $loose ) {
 	if ( $config{DELETE_THEN_ADD} ) {
 	    emit ( "\nfind_interface_addresses $interface | while read address; do",
-		   "    qt ip -$family rule del from $address",
+		   "    qt ip -$family rule del from \$address",
 		   'done'
 		 );
 	}
@@ -441,7 +440,7 @@ sub add_a_provider( $$$$$$$$ ) {
 	emit "\nrulenum=0\n";
 
 	emit  ( "find_interface_addresses $interface | while read address; do" );
-	emit  (	"    qt ip $family rule del from $address" ) if $config{DELETE_THEN_ADD};
+	emit  (	"    qt ip -$family rule del from \$address" ) if $config{DELETE_THEN_ADD};
 	emit  (	"    run_ip rule add from \$address pref \$(( $rulebase + \$rulenum )) table $number",
 		"    echo \"qt ip -$family rule del from \$address\" >> \${VARDIR}/undo_routing",
 		'    rulenum=$(($rulenum + 1))',
@@ -568,7 +567,7 @@ sub setup_providers() {
 
 	    fatal_error "A non-empty providers file is not permitted with MANGLE_ENABLED=No" unless $config{MANGLE_ENABLED};
 
-	    emit "\nif [ -z \"\$NORTC\" ]; then";
+	    emit "\nif [ -z \"\$NOROUTES\" ]; then";
 
 	    push_indent;
 
@@ -714,7 +713,7 @@ sub setup_providers() {
 	emit "\nundo_routing";
 	emit 'restore_default_route';
 	if ( $config{NULL_ROUTE_RFC1918} ) {
-	    emit "\nif [ -z \"\$NORTC\" ]; then";
+	    emit "\nif [ -z \"\$NOROUTES\" ]; then";
 
 	    push_indent;
 
diff --git a/Shorewall-perl/Shorewall/Rules.pm b/Shorewall-perl/Shorewall/Rules.pm
index 1a6ba8541..3cf4d1201 100644
--- a/Shorewall-perl/Shorewall/Rules.pm
+++ b/Shorewall-perl/Shorewall/Rules.pm
@@ -663,7 +663,7 @@ sub add_common_rules() {
 	    $globals{LOGPARMS} = $savelogparms;
 
 	    if ( $config{TCP_FLAGS_DISPOSITION} eq 'REJECT' ) {
-		add_rule $logflagsref , '-j REJECT --reject-with tcp-reset';
+		add_rule $logflagsref , '-p 6 -j REJECT --reject-with tcp-reset';
 	    } else {
 		add_rule $logflagsref , "-j $config{TCP_FLAGS_DISPOSITION}";
 	    }
diff --git a/Shorewall-shell/compiler b/Shorewall-shell/compiler
index 77323c422..c57481f67 100755
--- a/Shorewall-shell/compiler
+++ b/Shorewall-shell/compiler
@@ -3882,7 +3882,7 @@ __EOF__
 
 	    case $TCP_FLAGS_DISPOSITION in
 		REJECT)
-		    run_iptables -A logflags -j REJECT --reject-with tcp-reset
+		    run_iptables -A logflags -p tcp -j REJECT --reject-with tcp-reset
 		    ;;
 		*)
 		    run_iptables -A logflags -j $TCP_FLAGS_DISPOSITION