diff --git a/ip6t-firewall-gateway b/ip6t-firewall-gateway
index 8f7ae2c..895d3ed 100755
--- a/ip6t-firewall-gateway
+++ b/ip6t-firewall-gateway
@@ -450,25 +450,25 @@ if $protect_against_several_attacks ; then
    for _dev in ${dsl_device_arr[@]} ; do
       if $log_spoofed || $log_all ; then
          $ip6t -A INPUT -i $_dev -s $ula_block -j $LOG_TARGET $tag_log_prefix "$log_prefix Private (ula_block): "
-         $ip6t -A INPUT -i $_dev -s $loopback -j $LOG_TARGET $tag_log_prefix "$log_prefix (loopback): "
+         $ip6t -A INPUT -i $_dev -s $loopback_ipv6 -j $LOG_TARGET $tag_log_prefix "$log_prefix (loopback): "
          if $kernel_forward_between_interfaces ; then
             $ip6t -A FORWARD -i $_dev -s $ula_block -j $LOG_TARGET $tag_log_prefix "$log_prefix Private (ula_block): "
-            $ip6t -A FORWARD -i $_dev -s $loopback -j $LOG_TARGET $tag_log_prefix "$log_prefix (loopback): "
+            $ip6t -A FORWARD -i $_dev -s $loopback_ipv6 -j $LOG_TARGET $tag_log_prefix "$log_prefix (loopback): "
          fi
       fi
       $ip6t -A INPUT -i $_dev -s $ula_block -j DROP
-      $ip6t -A INPUT -i $_dev -s $loopback -j DROP
+      $ip6t -A INPUT -i $_dev -s $loopback_ipv6 -j DROP
       if $kernel_forward_between_interfaces ; then
          $ip6t -A FORWARD -i $_dev -s $ula_block -j DROP
-         $ip6t -A FORWARD -i $_dev -s $loopback -j DROP
+         $ip6t -A FORWARD -i $_dev -s $loopback_ipv6 -j DROP
       fi
 
       # Don't allow spoofing from that server
       $ip6t -A OUTPUT -o $_dev -s $ula_block -j DROP
-      $ip6t -A OUTPUT -o $_dev -s $loopback -j DROP
+      $ip6t -A OUTPUT -o $_dev -s $loopback_ipv6 -j DROP
       if $kernel_forward_between_interfaces ; then
          $ip6t -A FORWARD -o $_dev -s $ula_block -j DROP
-         $ip6t -A FORWARD -o $_dev -s $loopback -j DROP
+         $ip6t -A FORWARD -o $_dev -s $loopback_ipv6 -j DROP
       fi
    done
    echo_done
diff --git a/ipt-firewall-gateway b/ipt-firewall-gateway
index 230f68b..505523f 100755
--- a/ipt-firewall-gateway
+++ b/ipt-firewall-gateway
@@ -824,12 +824,13 @@ if $protect_against_several_attacks ; then
    # - Protection against syn-flooding
    # ---
 
-   $ipt -N syn-flood
-   $ipt -A syn-flood -m limit --limit 1/second --limit-burst 3 -j RETURN
+   $ipt -N syn_flood
+   $ipt -A INPUT -p tcp --syn -j syn_flood
+   $ipt -A syn_flood -m limit --limit 1/s --limit-burst 3 -j RETURN
    if $log_syn_flood || $log_all ; then
-      $ipt -A syn-flood -j $LOG_TARGET $tag_log_prefix "$log_prefix SYN flood: "
+      $ipt -A syn_flood -j $LOG_TARGET $tag_log_prefix "$log_prefix SYN flood: "
    fi
-   $ipt -A syn-flood -j DROP
+   $ipt -A syn_flood -j DROP
 
 
    # ---
@@ -934,7 +935,7 @@ if $protect_against_several_attacks ; then
          $ipt -A INPUT -i $_dev -s $priv_class_a -j $LOG_TARGET $tag_log_prefix "$log_prefix Class A private net: "
          $ipt -A INPUT -i $_dev -s $priv_class_b -j $LOG_TARGET $tag_log_prefix "$log_prefix Class B private net: "
          $ipt -A INPUT -i $_dev -s $priv_class_c -j $LOG_TARGET $tag_log_prefix "$log_prefix Class C private net: "
-         $ipt -A INPUT -i $_dev -s $loopback -j $LOG_TARGET $tag_log_prefix "$log_prefix From Loopback: "
+         $ipt -A INPUT -i $_dev -s $loopback_ipv4 -j $LOG_TARGET $tag_log_prefix "$log_prefix From Loopback: "
          $ipt -A INPUT -i $_dev -s $class_d_multicast -j $LOG_TARGET $tag_log_prefix "$log_prefix Class D Multicast: "
          $ipt -A INPUT -i $_dev -s $class_e_reserved -j $LOG_TARGET $tag_log_prefix "$log_prefix Class E reserved: "
          #$ipt -A INPUT -i $_dev -d $broadcast_addr -j $LOG_TARGET $tag_log_prefix "$log_prefix Broadcast Address: "
@@ -943,7 +944,7 @@ if $protect_against_several_attacks ; then
             $ipt -A FORWARD -i $_dev -s $priv_class_a -j $LOG_TARGET $tag_log_prefix "$log_prefix Class A private net: "
             $ipt -A FORWARD -i $_dev -s $priv_class_b -j $LOG_TARGET $tag_log_prefix "$log_prefix Class B private net: "
             $ipt -A FORWARD -i $_dev -s $priv_class_c -j $LOG_TARGET $tag_log_prefix "$log_prefix Class C private net: "
-            $ipt -A FORWARD -i $_dev -s $loopback -j $LOG_TARGET $tag_log_prefix "$log_prefix From Loopback: "
+            $ipt -A FORWARD -i $_dev -s $loopback_ipv4 -j $LOG_TARGET $tag_log_prefix "$log_prefix From Loopback: "
             $ipt -A FORWARD -i $_dev -s $class_d_multicast -j $LOG_TARGET $tag_log_prefix "$log_prefix Class D Multicast: "
             $ipt -A FORWARD -i $_dev -s $class_e_reserved -j $LOG_TARGET $tag_log_prefix "$log_prefix Class E reserved: "
             #$ipt -A FORWARD -i $_dev -d $broadcast_addr -j $LOG_TARGET $tag_log_prefix "$log_prefix Broadcast Address: "
@@ -956,7 +957,7 @@ if $protect_against_several_attacks ; then
       # Retfuse packets claiming to be from a Class C private network.
       $ipt -A INPUT -i $_dev -s $priv_class_c -j DROP
       # Refuse packets claiming to be from loopback interface.
-      $ipt -A INPUT -i $_dev -s $loopback -j DROP
+      $ipt -A INPUT -i $_dev -s $loopback_ipv4 -j DROP
       # Refuse Class D multicast addresses. Multicast is illegal as a source address.
       $ipt -A INPUT -i $_dev -s $class_d_multicast -j DROP
       # Refuse Class E reserved IP addresses.
@@ -971,7 +972,7 @@ if $protect_against_several_attacks ; then
          # Refuse packets claiming to be from a Class C private network.
          $ipt -A FORWARD -i $_dev -s $priv_class_c -j DROP
          # Refuse packets claiming to be from loopback interface.
-         $ipt -A FORWARD -i $_dev -s $loopback -j DROP
+         $ipt -A FORWARD -i $_dev -s $loopback_ipv4 -j DROP
          # Refuse Class D multicast addresses. Multicast is illegal as a source address.
          $ipt -A FORWARD -i $_dev -s $class_d_multicast -j DROP
          # Refuse Class E reserved IP addresses.
@@ -991,14 +992,14 @@ if $protect_against_several_attacks ; then
    # quench to the loopback.
    for _dev in ${ext_if_arr[@]} ; do
       if $log_to_lo || $log_all ; then
-         $ipt -A INPUT -i $_dev -d $loopback -j $LOG_TARGET $tag_log_prefix "$log_prefix To Loopback: "
+         $ipt -A INPUT -i $_dev -d $loopback_ipv4 -j $LOG_TARGET $tag_log_prefix "$log_prefix To Loopback: "
          if $kernel_activate_forwarding ; then
-            $ipt -A FORWARD -i $_dev -d $loopback -j $LOG_TARGET $tag_log_prefix "$log_prefix To Loopback: "
+            $ipt -A FORWARD -i $_dev -d $loopback_ipv4 -j $LOG_TARGET $tag_log_prefix "$log_prefix To Loopback: "
          fi
       fi
-      $ipt -A INPUT -i $_dev -d $loopback -j DROP
+      $ipt -A INPUT -i $_dev -d $loopback_ipv4 -j DROP
       if $kernel_activate_forwarding  ; then
-         $ipt -A FORWARD -i $_dev -d $loopback -j DROP
+         $ipt -A FORWARD -i $_dev -d $loopback_ipv4 -j DROP
       fi
    done
 
@@ -1012,12 +1013,12 @@ if $protect_against_several_attacks ; then
          $ipt -A OUTPUT -o $_dev -s $priv_class_a -j $LOG_TARGET $tag_log_prefix "$log_prefix out Class A: "
          $ipt -A OUTPUT -o $_dev -s $priv_class_b -j $LOG_TARGET $tag_log_prefix "$log_prefix out Class B: "
          $ipt -A OUTPUT -o $_dev -s $priv_class_c -j $LOG_TARGET $tag_log_prefix "$log_prefix out Class C: "
-         $ipt -A OUTPUT -o $_dev -s $loopback -j $LOG_TARGET $tag_log_prefix "$log_prefix out Loopback: "
+         $ipt -A OUTPUT -o $_dev -s $loopback_ipv4 -j $LOG_TARGET $tag_log_prefix "$log_prefix out Loopback: "
       fi
       $ipt -A OUTPUT -o $_dev -s $priv_class_a -j DROP
       $ipt -A OUTPUT -o $_dev -s $priv_class_b -j DROP
       $ipt -A OUTPUT -o $_dev -s $priv_class_c -j DROP
-      $ipt -A OUTPUT -o $_dev -s $loopback -j DROP
+      $ipt -A OUTPUT -o $_dev -s $loopback_ipv4 -j DROP
    done
 
    echo_done