Astak R4020A - User Manual - Manual (Page 54)

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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 1360 and 1492 bytes.
The default value is 1454.
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.
D. PPTP
Item Description
WAN Access Type Select PPTP type to access the WAN.