how to reduce traffic caused by lame delegation

hi there,

i need to know how to reduce dns traffic on port 53 from external.
i have a huge amount of lame server reolving messages.

ok, i can disable the writing in my logs by using the logging option
in named.conf, although the traffic rises and rises on port 53.

i tried first to set recursion no, but after that no one from internal
can
resolve anything.
so i tried allow-recursion only to internal, but that didn't affected
the lame server queries.

please can someone tell me how to prevent my primary/secondary dns
servers being
affected on this much lame server queries?

Regards Wolf