Technical Reference; Lans, Wans And The Vmg; Dhcp Setup; Dns Server Addresses - ZyXEL Communications VMG9827-B50A User Manual

8.9 Technical Reference

This section provides some technical background information about the topics covered in this chapter.
8.9.1

LANs, WANs and the VMG

The actual physical connection determines whether the VMG ports are LAN or WAN ports. There are two
separate IP networks, one inside the LAN network and the other outside the WAN network as shown
next.
Figure 62 LAN and WAN IP Addresses

8.9.2 DHCP Setup

DHCP (Dynamic Host Configuration Protocol, RFC 2131 and RFC 2132) allows individual clients to obtain
TCP/IP configuration at start-up from a server. You can configure the VMG as a DHCP server or disable it.
When configured as a server, the VMG provides the TCP/IP configuration for the clients. If you turn DHCP
service off, you must have another DHCP server on your LAN, or else the computer must be manually
configured.
IP Pool Setup
The VMG is pre-configured with a pool of IP addresses for the DHCP clients (DHCP Pool). See the product
specifications in the appendices. Do not assign static IP addresses from the DHCP pool to your LAN
computers.

8.9.3 DNS Server Addresses

DNS (Domain Name System) maps a domain name to its corresponding IP address and vice versa. The
DNS server is extremely important because without it, you must know the IP address of a computer
before you can access it. The DNS server addresses you enter when you set up DHCP are passed to the
client machines along with the assigned IP address and subnet mask.
There are two ways that an ISP disseminates the DNS server addresses.
Chapter 8 Home Networking
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