diff --git a/New/Shorewall/Common.pm b/New/Shorewall/Common.pm
index 5dabe909b..29fcb5b67 100644
--- a/New/Shorewall/Common.pm
+++ b/New/Shorewall/Common.pm
@@ -106,7 +106,7 @@ sub emit ( $ ) {
 	#
 	# 'compile' as opposed to 'check'
 	#
-	my $line = $_[0]; # This copy is necessary :-(. We modify the value below and we can't modify subroutine arguments.
+	my $line = $_[0]; # This copy is necessary because the actual arguments are almost always read-only.
 
 	unless ( $line =~ /^\s*$/ ) {
 	    $line =~ s/^\n// if $lastlineblank;
diff --git a/New/Shorewall/Rules.pm b/New/Shorewall/Rules.pm
index 600c59f05..9aac1666b 100644
--- a/New/Shorewall/Rules.pm
+++ b/New/Shorewall/Rules.pm
@@ -491,6 +491,8 @@ sub add_common_rules() {
     if ( $capabilities{ADDRTYPE} ) {
 	$chainref = new_standard_chain 'smurfs';
 
+	add_rule $chainref , '-s 0.0.0.0 -j RETURN'; 
+
 	add_rule_pair $chainref, '-m addrtype --src-type BROADCAST ', 'DROP', $config{SMURF_LOG_LEVEL} ;
 	add_rule_pair $chainref, '-m addrtype --src-type MULTICAST ', 'DROP', $config{SMURF_LOG_LEVEL} ;