SonicOS: Configure DNS and NetBIOS Name Resolution in Log Reports on SonicWall Firewall (UTM) Appliances
The Log > Name Resolution page includes settings for configuring the name servers used to resolve IP addresses and server names in the log reports. The security appliance uses a DNS server or NetBIOS to resolve all IP addresses in log reports into server names. It stores the names/address pairs in a cache to assist with future lookups. You can clear the cache by clicking Reset Name Cache in the top of the Log > Name Resolution page.
In the Name Resolution Method list, select:
None: The security appliance will not attempt to resolve IP addresses and Names in the log reports.
DNS: The security appliance will use the DNS server you specify to resolve addresses and names.
NetBios: The security appliance will use NetBios to resolve addresses and names. If you select NetBios, no further configuration is necessary.
DNS then NetBios: The security appliance will first use the DNS server you specify to resolve addresses and names. If the DNS name cannot be resolved, a second attempt will be made using NetBios.
If one of the DNS options is chosen, follow these steps to define the DNS servers:
Under DNS Settings, select Specify DNS Servers Manually or Inherit DNS Settings Dynamically from WAN Zone. The second choice is selected by default.
If you chose to specify a DNS server, enter the IP address for at least one DNS server on your network. You can enter up to three servers.
Click Apply in the top right corner of the Log > Name Resolution page.