Astak R4020A - User Manual - Manual (Page 57)

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Idle Time
When you select "Connect on Demand" as connection type,
you can set an idle time between 1 to 1000 minutes for
demand.
The default value is 5 minutes.
MTU Size
You can set the MTU size between 1400 and 1460 bytes.
The default value is 1460.
DNS
There are two ways to set DNS: "Attain DNS Automatically"
and "Set DNS Manually".
You can select “Attain DNS automatically" if your DNS
provided by ISP is dynamic; Or select "Set DNS Manually"
and input the DNS addresses that provided by your ISP. You
can set up to three DNS addresses.
*The other parameters can be set as Static IP type.
After setting the parameters, please click the button to save the
configurations, or click the button to reset the configurations before you
changed them.