diff -r 92045b0e8e17 -r 2340826a516b sbin/mbse-firewall
--- a/sbin/mbse-firewall	Thu Dec 18 16:56:55 2014 +0100
+++ b/sbin/mbse-firewall	Thu Dec 18 17:01:36 2014 +0100
@@ -400,6 +400,11 @@
     $IP6TABLES -A OUTPUT  -p ipv6-icmp -m icmp6 --icmpv6-type router-advertisement -m hl --hl-eq 255 -j ACCEPT 
     $IP6TABLES -A OUTPUT  -p ipv6-icmp -m icmp6 --icmpv6-type neighbour-solicitation -m hl --hl-eq 255 -j ACCEPT 
     $IP6TABLES -A OUTPUT  -p ipv6-icmp -m icmp6 --icmpv6-type neighbour-advertisement -m hl --hl-eq 255 -j ACCEPT 
+    # Allow inverse neighbour discovery solicitation (141) / advertisement (142)
+    $IP6TABLES -A INPUT   -p ipv6-icmp -m icmp6 --icmpv6-type 141 -m hl --hl-eq 255 -j ACCEPT
+    $IP6TABLES -A INPUT   -p ipv6-icmp -m icmp6 --icmpv6-type 142 -m hl --hl-eq 255 -j ACCEPT
+    $IP6TABLES -A OUTPUT  -p ipv6-icmp -m icmp6 --icmpv6-type 141 -m hl --hl-eq 255 -j ACCEPT
+    $IP6TABLES -A OUTPUT  -p ipv6-icmp -m icmp6 --icmpv6-type 142 -m hl --hl-eq 255 -j ACCEPT
 
     # MLD messages. DROP on external interface, but ACCEPT on others.
     if [ -n "$IF_EXT6" -a "$IF_EXT_IS_BORDER_GW" = "1" ]; then