$DropMsgsWithMaliciousDnsPTRRecords¶

Type: global configuration parameter

Default: off

Description:

Rsyslog contains code to detect malicious DNS PTR records (reverse name resolution). An attacker might use specially-crafted DNS entries to make you think that a message might have originated on another IP address. Rsyslog can detect those cases. It will log an error message in any case. If this option here is set to “on”, the malicious message will be completely dropped from your logs. If the option is set to “off”, the message will be logged, but the original IP will be used instead of the DNS name. Reverse lookup results are cached; see Reverse DNS caching for controlling cache timeout and refresh.

Sample:

$DropMsgsWithMaliciousDnsPTRRecords on

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