# Response (answer) we didn't see a Request for. Could be packet loss.
alert dns any any -> any any (msg:"SURICATA DNS Unsollicited response"; flow:to_client; app-layer-event:dns.unsollicited_response; sid:2240001; rev:1;)
# Malformed data in request. Malformed means length fields are wrong, etc.
alert dns any any -> any any (msg:"SURICATA DNS malformed request data"; flow:to_client; app-layer-event:dns.malformed_data; sid:2240002; rev:1;)
alert dns any any -> any any (msg:"SURICATA DNS malformed response data"; flow:to_server; app-layer-event:dns.malformed_data; sid:2240003; rev:1;)
# Response flag set on to_server packet
alert dns any any -> any any (msg:"SURICATA DNS Not a request"; flow:to_server; app-layer-event:dns.not_a_request; sid:2240004; rev:1;)
# Response flag not set on to_client packet
alert dns any any -> any any (msg:"SURICATA DNS Not a response"; flow:to_client; app-layer-event:dns.not_a_response; sid:2240005; rev:1;)
# Z flag (reserved) not 0
alert dns any any -> any any (msg:"SURICATA DNS Z flag set"; app-layer-event:dns.z_flag_set; sid:2240006; rev:1;)
# Request Flood Detected
alert dns any any -> any any (msg:"SURICATA DNS request flood detected"; flow:to_server; app-layer-event:dns.flooded; sid:2240007; rev:1;)
# Per-flow (state) memcap reached. Relates to the app-layer.protocols.dns.state-memcap setting.
alert dns any any -> any any (msg:"SURICATA DNS flow memcap reached"; flow:to_server; app-layer-event:dns.state_memcap_reached; sid:2240008; rev:2;)