User manual

EE400-R GigaFast Ethernet.
P 37
For example, if you have an FTP server (port 21) at 192.168.8.5, a mail server (port 110) at 192.168.8.6,
and a VPN server at 192.168.8.7, then
y
ou need to specif
y
the virtual server as:
21 I 192.168.8.5
110 I 192.168.8.6
1723 I 192.168.8.7
Please refer to Appendix A for some well-know service ports.
4.5 DMZ
DMZ (DeMilitarized Zone) is a zone, which is not protected by firewall. It means that all computers in
the DMZ are dan
g
erous and sub
j
ect to be attacked/accessed b
y
Internet intrude
r
s
/
hackers. However
the advantage is that all computers in the DMZ are completely exposed to Internet, thus all of them gain the
full access right privilege to the outside Internet. In such a case, theoretically, all Internet applications
should be compatible with them because there is no interference from the firewall.
There are more and more Internet applications need 2-way access right (like video and/or audio
conference, on-line game..). EE400-R provide the similar features to make some computers in LAN to
have unrestricted 2-wa
y
access privile
g
e. As a result, all computers in DMZ are most compatible with
Internet applications. Thus, the
y
seem to be dan
g
erous in comparison with those other computers in the
LAN.