udp vs tcp query

[Benny Pedersen]

On Thu, 27 Oct 2011 07:04:42 +0200, Emanuele Balla (aka Skull) wrote:
> TCP is needed only when replies do not fit 512 bytes (let's ignore 
> EDNS0
> and such). For any DNSBL, this limit is not a problem at all.

its was edns0 defaults that maked most problems, from my logs it seem 
more stable now, have set 4k edns0 size

just still dont understand why it helps servers that does not support 
edns0