Patton electronic 2120 用户手册

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The Subnet Mask settings that correspond with the 2120 unit and serial 
interface IP addresses should be configured with the appropriate Subnet 
Mask for the LAN where the IP addresses reside. 

The Subnet Mask for the Model 2120 unit is configured by executing the 
following commands at the 2120 command system prompt:

The Subnet Mask for the Model 2120 serial interface is configured by 
executing the following commands at the 2120 command system prompt:

When operating in PPP mode and accessing the Internet through the 
Model 2120, the several options are available and supported for Internet 
domain name resolution.  When operating in SLIP mode, the Model 2120 
must be configured to obtain the name server addresses from the SLIP 
client device.

The Model 2120 supports DNS address exchange with the PPP device.  
Primary and secondary DNS addresses can be configured for the PPP 
client device.  The primary and secondary DNS addresses are config-
ured by executing the following commands at the 2120 command system 
prompt: