dns packet size

[Stephane Bortzmeyer]

On Thu, Oct 09, 2008 at 09:49:57AM -0400,
 jeff donovan <donovan at beth.k12.pa.us> wrote 
 a message of 29 lines which said:

> i have been noticing my firewall denying udp packets that exceed
> 512.  

Very bad idea. It will prevent any DNS feature younger than twelve
years (DNSSEC, IDN, IPv6).

> What is the correct packet size ,

64k, the maximum size of an UDP packet.