grandenet: Keep firewall open on IPv6

  It is Unrestricted but it prevent it get broken, a new review should be done.

net-misc/re6stnet/files/grandenet

@@ -47,8 +47,9 @@ function configure {
 
     echo "
 *filter
+:INPUT ACCEPT [0:0]
 :FORWARD ACCEPT [0:0]
-:OUTPUT DROP [0:0]
+:OUTPUT ACCEPT [0:0]
 -A INPUT -p udp -m udp --dport 6696 -j ACCEPT
 -A INPUT -p udp -m udp --dport 326 -j ACCEPT
 -A INPUT -p tcp -m tcp --dport 9684 -j ACCEPT
@@ -216,6 +217,8 @@ if [ -r "${configdir}/ip6tables.conf" ] ; then
     ip6tables-restore < "${configdir}/current_ip6tables.conf"
 else
     # accept ports needed for re6stnet
+    ip6tables -P INPUT ACCEPT
+    ip6tables -P OUTPUT ACCEPT
     ip6tables -P FORWARD ACCEPT
     ip6tables -A OUTPUT -p udp --dport 6696 -j ACCEPT
     ip6tables -A OUTPUT -p udp --dport 326 -j ACCEPT