Product Function Introduction; Network Basic Function; Ip Address Introduction; Subnet Mask Introduction - Ebyte E810-DTU User Manual

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3. Product function introduction

3.1. Network basic function

3.1.1 IP address introduction

The IP address refers to the Internet Protocol address, which indicates the identity of the module in the LAN. The IP address is
unique in the LAN and therefore cannot be duplicated with other device addresses in the same LAN. The E820-TTL-02 module
supports both static IP and DHCP IP acquisition methods.
 Static IP
The static IP is required to be manually set by the user. During the setting process, note that the IP, subnet mask and gateway are
simultaneously written. Static IP is suitable for LAN communication without DHCP Server or fixed IP address.
 DHCP
The main function of DHCP is to dynamically obtain IP address, Gateway address and NDS server address information from
gateway host (with DHCP server). By DHCP, users can save the tedious steps of setting IP address manually, and avoid the conflict of
IP address in LAN caused by setting IP address manually.
Note: Usually the computer does not have the DHCP Server function. When the E820-TTL-02 is set to DHCP and is directly
connected to the computer, it will not be able to transmit normally because it has been waiting for the IP address.

3.1.2 Subnet mask introduction

The subnet mask is used to indicate which network the host indicated by the IP address is on. The subnet mask cannot exist
separately. It needs to be used together with the IP address. Its role is to divide an IP into two parts: the network address and the host
address.
Subnet mask is a 32 bit address. For class A address, the default subnet mask is 255.0.0, class B 255.255.0, and class C
255.255.255.0. For example, for our commonly used class C address, the capacity of IP in the subnet is numbers, but because all 0 and
all 1 are special IP addresses in the IP address, the number of IP available in class C subnet mask is 254.

3.1.3 Gateway introduction

Gateway, also known as Inter-Network Connector, realizes the interconnection between two networks. If the device is connected
to a router, then the gateway is the router IP address. The device can access another network (or local area network) connect ed by the
gateway through the gateway.

3.1.4 DNS introduction

DNS is called Domain Name System. The distribution of domain names and IP addresses on the World Wide Web (www) is a database.
After the device has the correct DNS server, it can interact with the external network (World Wide Web) server through the network
domain name.
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E810-DTU(1RS1E) User Manual
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