Issue DNS DDoS amplification attack

[Manos_Gk]

17:38:39.544260 IP 64.74.97.202.krb524 > xxx.xxx.xxx.xxx.domain: 42732+ [1au] ANY? cpsc.gov. (37)

I turned recursion to localhost but the attack continues.
Is there anyway to close recursion? (Not even to localhost)

 

[SBDavid]

Can you paste the content of named.conf file? Replace your domain names with anything else.