Astak R4020A - User Manual - Manual (Page 46)

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TCP/IP
LAN Interface
In this page, you can configure the parameters for the local network using a LAN
connection to the router.
The Web interfaces will display differently in each working mode.
 Router Mode
Item Description
IP Address
This IP address is the LAN port IP address of your router.
You must use this IP to enter the Web management interface. If you
changed the IP, please use the new IP to enter the Web interface.
The default IP is 192.168.100.1.
Subnet Mask
The subnet mask is an address code which determines the size of
the network. You can set it as you need.
The default size is 255.255.255.0.
Default Gateway
A gateway is a network point accessing to another network.
The default gateway is 0.0.0.0.