Asus RX3042H - Manual (Page 62)

DHCP Server Configuration RX3042H User's Manual
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DHCP Lease configuration page by clicking Advanced ->DHCP
Server menu
6.2 DNS
6.2.1 About DNS
Domain Name System (DNS) servers map the user-friendly domain
names that users type into their Web browsers (e.g., “yahoo.com”)
to the equivalent numerical IP addresses that are used for Internet
routing.
When a PC user types a domain name into a browser, the PC must
first send a request to a DNS server to obtain the equivalent IP
address. The DNS server will attempt to look up the domain name
in its own database, and will communicate with higher-level DNS
servers when the name cannot be found locally. When the address
is found, it is sent back to the requesting PC and is referenced in IP
packets for the remainder of the communication.
6.2.2 Assigning DNS Addresses
Multiple DNS addresses are useful to provide alternatives when
one of the servers is down or is encountering heavy traffic. ISPs
typically provide primary and secondary DNS addresses, and may
provide additional addresses. Your LAN PCs learn these DNS
addresses in one of the following ways:
• Statically: If your ISP provides you with their DNS server
addresses, you can assign them to each PC by modifying the
PCsʼ IP properties.
• Dynamically from a DHCP Server: You can configure the DNS
addresses in the DHCP server in the RX3042H and allow the
DHCP server to distribute the DNS addresses to the PCs. Refer
to the section 6.1.3 “Configuring DHCP Server” for instructions
on configuring DHCP server.
In either case, you can specify the actual addresses of the ISPʼs
DNS servers (on the PC or in the DHCP Server configuration page),
or you can specify the address of the LAN port on the RX3042H
(e.g., 192.168.1.1). When you specify the LAN port IP address, the
device performs DNS relay, as described in the following section.