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Chapter 8 LAN
8.9.1
LANs, WANs and the SBG3500-N
The actual physical connection determines whether the SBG3500-N 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 59 LAN and WAN IP Addresses
LAN
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 SBG3500-N as a DHCP
server or disable it. When configured as a server, the SBG3500-N 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 SBG3500-N 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.
• The ISP tells you the DNS server addresses, usually in the form of an information sheet, when
you sign up. If your ISP gives you DNS server addresses, enter them in the DNS Server fields in
the DHCP Setup screen.
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WAN
SBG3500-N000 User's Guide
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Troubleshooting
