GEN:SID 1:257
Message DNS named version attempt
Summary A remote machine attempted to determine the version of your DNS
server.
Impact Could indicate an impending attack, or maybe an innocent
reconnaissance attempt.
Detailed Information A remote machine attempted to determine the version
of your BIND DNS server.
Affected Systems  
Attack Scenarios As part of reconnaissance leading upto a potential intrusion attempt, an
attacker may attempt to determine the BIND version that you are running in
hopes of finding an unpatched version.
Ease of Attack Simple
Corrective Action Disable the ability for untrusted (remote) machines to determine your named
version.  
Additional References  
Rule References arachnids: 278
nessus: 10028