Chapter 3 Configuration - 16
3.3.2.3 Table of fixed host entries
DHCP server can assign IP addresses and some options, such as gateway's IP
address, DNS server, etc., to hosts in ESG-103's LAN side. Usually, DHCP
server assigns IP addresses dynamically. However, you can assign MAC
address and IP address to be one pair. When DHCP server receive request
from that host whose MAC address is one of those pairs in its mapping table,
DHCP server will assign that mapping IP address to host.
3.3.3 NAT/DMZ Setup
NAT is a mechanism that can convert your private IP addresses into a single
public IP address. In ESG-103, we offer dynamic NAT, static NAT, and
NAPT functions.
Dynamic NAT
means that you can assign a range of pri-
vate IP addresses to map to a range of public IP addresses in the WAN inter-
face. When one public IP address is mapped to one host, this public IP
address could not be assigned to the other hosts.
Static NAT
means you
can set up a private IP address and public IP address to be a pair. In ESG-103,
you can set up to 5 set static NAT. This function is very similar to
DMZ
(demilitarized zone). In ESG-103, it also acts as "
Virtual DMZ
" host setting.
NAPT
is a special function of NAT.
NAT
records packet's Port and IP
address, converts it into public IP address in the WAN side and gives this
session one unique port number. Most of the famous applications are sup-
ported by ESG-103 such as HTTP, FTP, Telnet, NetMeeting, RealPlayer,
QuickTime, ....etc. NAT is a default function in ESG-103.
