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h1. DNS-keywords

(from v2.0)
There are some more content modifiers (If you are unfamiliar with content modifiers, please visit the page Payload keywords). These ones make sure the signature checks a specific part of the network-traffic.


With dns_query the DNS request queries are inspected. The dns_query keyword works a bit different from the normal content modifiers. When used in a rule all contents following it are affected by it.

alert dns any any -> any any (msg:"Test dns_query option"; dns_query; content:"google"; nocase; sid:1;)

The dns_query keyword affects all following contents, until pkt_data is used or it reaches the end of the rule.