SATO CL4NX Operator's Manual page 111

4 Operation and Configuration
DNS
Interface > Network > Settings > LAN > IPv4 > DNS
If you have selected Static in the Mode menu, set and check DNS server
addresses.
The setting range is as follows:
000.000.000.000 to 255.255.255.255
Note
You can register up to three IP addresses for the DNS server. Use a
comma to delimit different IP addresses.
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CL4NX/CL6NX Operator Manual