Milan Technology MIL-SM8002TG - Manual (Page 126)

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Gateway: assign the switch gateway. The default value is 192.168.1.254.
DNS1: Short for Domain Name Server an Internet service that translates domain
name into IP addresses. Because domain name are alphabetic, they're easier to
remember. The Internet is based on IP address . Every time you use a domain
name , therefore, a DNS service must translate the name into the corresponding IP
address. For example, the domain name www.net.com might translate to
192.168.1.1.
DNS2: The backup for DNS1. When the DNS1 cannot function, the DNS2 can
replace DNS1 immediately.
IP configuration interface
DHCP Configuration
It short for Dynamic Host Configuration Protocol that is a protocol for assigning dynamic
IP addresses to devices on a network. With dynamic addressing, a device can have a
different IP address every time it connects to the network. In some systems, the device's
IP address can even change while it is still connected. DHCP also supports a mix of static
and dynamic IP addresses. Dynamic addressing simplifies network administration