User manual

EE400-R GigaFast Ethernet.
P 39
In general, the mechanism for multiple DMZ hosts is based on the mapping relation between the WAN IP and
the LAN IP
(
shown below
)
. These DMZ host IPs will skip NAT port translation handlin
g
to
g
ain
WAN IP1
IEE400-RI LAN IP1 (DMZ host1)
WAN IP2
IEE400-RI LAN IP2 (DMZ host2)
WAN IP3
IEE400-RI LAN IP3 (DMZ host3)
WAN IP4
IEE400-RI LAN IP4 (DMZ host4)
unrestricted 2-way communication capability.
Most likely the multiple DMZ hosts are applied in a router-to-router inter-connection SOHO environment
(please refer to Figure 4-2). It is less popular with home users due to the “range of WAN IP address”
because IP addresses are important and expensive resources now.
Some ISPs provide leased line services (DSL is a common one) to subscribers, and can offer a
range of IP addresses for subscription. In this case, there are two types of connection configurations.
One is Brid
g
in
g
mode, the other is Routin
g
mode.
For example, if the ISP provides IPs 210.65.226.1 through 210.65.226.7 (subnet mask 255.255.255.248),
then the subscriber can have 6 computers at most accessing the Internet simultaneously. With the EE400-R,
additional computers can access the Internet.
(
Please refer to Fi
g
ure 4-1
)