DNS: Z Bit Set

This protocol anomaly triggers when it detects a DNS request/reply with a Z (zero) bit set in the header. This can indicate a non-standard DNS client/server or an exploit attempt.

Short Name
DNS:AUDIT:INVALID-Z
Severity
Info
Recommended
False
Recommended Action
None
Category
DNS
Release Date
04/22/2003
Supported Platforms

srx-branch-12.3

srx-19.3

srx-branch-19.3

vsrx3bsd-19.2

srx-branch-19.4

vsrx-19.4

mx-12.3

mx-19.4

vmx-19.4

mx-19.3

vsrx3bsd-19.4

srx-19.4

vsrx-12.3

vmx-19.3

vsrx-19.2

srx-12.3

Sigpack Version
3324
False Positive
Unknown

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