route-update.sh: filter out IPv4 addresses in IPv6 mode

router/route-update.sh

@@ -248,7 +248,12 @@ process_routes()
 
         {
             for f in $ip_lists ; do
-                grep -v '^#' "$f" | grep -v '^$'
+                if [ "$ipcmd" = "ip -6" ] ; then
+                    # IPv6 mode: only pass lines containing ":"
+                    grep -v '^#' "$f" | grep -v '^$' | grep ':'
+                else
+                    grep -v '^#' "$f" | grep -v '^$'
+                fi
             done
             if [ -n "$domain_lists" ] ; then
                 for f in $domain_lists ; do