From: Arno van Amersfoort <arnova@rocky.eld.leidenuniv.nl>
Subject: Block ipv6 traffic also when the firewall is up.
Origin: upstream, http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=594326#25
Bug-Debian: http://bugs.debian.org/594326
--- a/share/arno-iptables-firewall/environment
+++ b/share/arno-iptables-firewall/environment
@@ -391,7 +391,11 @@
     printf "\033[40m\033[1;31msysctl $@: ($retval) $result\033[0m\n" >&2
     return $retval
   fi
-  echo "${INDENT}sysctl $@"
+
+  if [ -n "$result" ]; then
+    echo "${INDENT}$result"
+  fi
+
   return 0
 }
 
@@ -424,7 +428,9 @@
       retval=$?
 
       if [ "$retval" = "0" ]; then
-        echo "${INDENT}${sysctl_commandline}"
+        if [ -n "$result" ]; then
+          echo "${INDENT}$result"
+        fi
         return 0
       else
         printf "\033[40m\033[1;31m${sysctl_commandline}: ($retval) $result\033[0m\n" >&2
