max-udp-size controls what you send. MAX(512, MIN(max-udp-size, client's UDP size)) edns-udp-size controls what you advertise you can receive. MAX(512, MIN(edns-udp-size, server's UDP size)) -- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: marka at isc.org