>> 100: from 10.0.100.0/16 lookup 10 > Not the actual problem, but this should be 10.0.0.0/16 instead of > 10.0.100.0/16. Is your A configuration file correct? Hmm, looks like there's a call to mask_prefix missing somewhere. (Note to self -- rename mask_prefix to normalise_prefix.) -- Juliusz