Network > Failover & Load Balancing
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SonicOS 5.8.1 Administrator Guide
DNS
When DNS name resolution issues are encountered with this firmware, you may need to select
the Specify DNS Servers Manually option and set the servers to Public DNS Servers (ICANN
or non-ICANN).
Note Depending on your location, some DNS Servers may respond faster than others. Verify that
these servers work correctly from your installation prior to using your SonicWALL appliance.