Allow ping and ipv6 for the mesh variant

src/freedombone

   apt-get -y install avahi-utils avahi-autoipd wireless-tools
 
   install_vpn_tunnel
-  
+
   modprobe batman-adv
   [ $? -ne 0 ] && echo "B.A.T.M.A.N module not available" && exit 76482
   if ! grep -q "batman_adv" /etc/modules; then
   sed -i "s/#net.ipv4.conf.all.rp_filter=1/net.ipv4.conf.all.rp_filter=1/g" /etc/sysctl.conf
   sed -i "s/#net.ipv4.ip_forward=1/net.ipv4.ip_forward=0/g" /etc/sysctl.conf
   sed -i "s/#net.ipv6.conf.all.forwarding=1/net.ipv6.conf.all.forwarding=0/g" /etc/sysctl.conf
-  echo '# ignore pings' >> /etc/sysctl.conf
-  echo 'net.ipv4.icmp_echo_ignore_all = 1' >> /etc/sysctl.conf
-  echo 'net.ipv6.icmp_echo_ignore_all = 1' >> /etc/sysctl.conf
-  echo '# disable ipv6' >> /etc/sysctl.conf
-  echo 'net.ipv6.conf.all.disable_ipv6 = 1' >> /etc/sysctl.conf
-  echo 'net.ipv4.tcp_synack_retries = 2' >> /etc/sysctl.conf
-  echo 'net.ipv4.tcp_syn_retries = 1' >> /etc/sysctl.conf
+  if [[ $SYSTEM_TYPE != "$VARIANT_MESH" ]]; then
+      echo '# ignore pings' >> /etc/sysctl.conf
+      echo 'net.ipv4.icmp_echo_ignore_all = 1' >> /etc/sysctl.conf
+      echo 'net.ipv6.icmp_echo_ignore_all = 1' >> /etc/sysctl.conf
+      echo '# disable ipv6' >> /etc/sysctl.conf
+      echo 'net.ipv6.conf.all.disable_ipv6 = 1' >> /etc/sysctl.conf
+      echo 'net.ipv4.tcp_synack_retries = 2' >> /etc/sysctl.conf
+      echo 'net.ipv4.tcp_syn_retries = 1' >> /etc/sysctl.conf
+  fi
   echo '# keepalive' >> /etc/sysctl.conf
   echo 'net.ipv4.tcp_keepalive_probes = 9' >> /etc/sysctl.conf
   echo 'net.ipv4.tcp_keepalive_intvl = 75' >> /etc/sysctl.conf