The device is configured with a single DNS server
At a glance
Base severity
Area
Platform
Evidence level
Benchmark reference
Reads the export, not the device
ConfigProof reads a configuration export. This control is evaluated against the objects in that file, and it reports what the file says. It does not connect to the device and sees no traffic, so a finding here describes the configuration, not what the firewall is doing right now.
Why it matters
The names the firewall's own services need (content and license updates, WildFire, external dynamic lists, FQDN address objects, server profiles) are configured to resolve through this one server. If it stops answering, nothing else is configured to answer, and the features that depend on those names stop updating.
How to fix it
Web interface
The steps below are written for the web interface. A finding raised on your own export carries the same steps with your object names filled in.
- Add a secondary DNS server under Device, Setup, Services, preferably one on a different network path from the primary.
Command line
PAN-OS CLI
set deviceconfig system dns-setting servers secondary <second-dns-server>An example. Values in angle brackets are yours to supply; a finding on your own export fills in the names it read. Nothing here commits. Review the candidate configuration, then commit it yourself.
Read it back
show deviceconfig system dns-settingValues to fill in1
- <second-dns-server>
- The address of a second DNS server, different from the first and preferably reached over another path
How to confirm the fix
- Confirm both servers answer queries from the management interface or the service route the device uses for DNS.
Limits
- A device that takes its DNS servers from DHCP on the management interface writes none, and is recorded as not written rather than judged.
- On a template stack the first template, in the stack's order, that writes either the servers or a DNS proxy object decides which one the firewalls use.
- On a Panorama each template stack is judged as its firewalls receive it: its own settings first, then its members in order. A stack holding a template this file lacks is recorded rather than passed.
Compliance references
No benchmark recommendation is mapped to this control in this version.
More in System and Metadata
- PAN-SEC-101Antivirus updates are not installed hourly
- PAN-SEC-102Applications and threats updates are not installed daily
- PAN-SEC-103WildFire updates are not installed in real time
- PAN-SEC-130Update server identity is not verified
- PAN-SW-001Software version is out of vendor support
- ISE-MGT-009Administration node runs an older patch than one installed
- ISE-MGT-010No successful configuration backup within seven days
- ISE-MGT-011Repository uses a clear-text protocol
See it on your own firewall
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