8
This is where NAT comes to the rescue. Network Address Translation allows a single device,
such as a router, to act as an agent between the Internet
(or "public network")
and a local
(or
"private")
network. This means that only a single, unique
IP address
is required to represent an
entire group of computers.
•
Printer Server
Printer Server allow networked
PC
sharing the same printer on the network, only the networked
PC has printer driver without physical connection directly with printer.
•
DDNS – Dynamic Domain Name System Server
Domain Name System Server is a server that matches
URLs (such as www.router-net.com)
to
numeric IP addresses.
DDNS
•
TCP/IP
Transmission Control Protocol (TCP)
with
Internet Protocol (IP).
The main internetworking
protocol used in the Internet.
•
PPPoE – PPP (Point-to-Point Protocol) over Ethernet
PPP
is the standard Internet protocol for dial-up connections.
PPPoE
is for connecting remote
hosts to the Internet over an always-on connection by simulating a dial-up connection.
•
UDP – User Datagram Protocol
UDP
provides a procedure for application programs to send messages to other programs with a
minimum of protocol mechanism. The protocol is transaction oriented, and
delivery and duplicate
protection is not guaranteed. Applications requiring ordered reliable delivery of streams of data
should use the
TCP
.
•
DMZ Host– De-Militarized Zone Host
DMZ is the portion of a private network that is visible through the network's firewalls. DMZ
Host allows a local computer exposed to the Internet. Therefore, an incoming packet will be
checked by
Firewall and NAT
algorithms in the router, then pass to the
DMZ
host when packet is
not sent by hacker and is not limited by Virtual Server list. Besides, there are some IP protocols
that does not have port number information. There is no way to use Virtual Server setting to
forward incoming packet. Thus,
DMZ
host is the way to forward such kind of packets. If you try
to enable
DMZ
host and setup Virtual Server, the precedence is Virtual Server and then
DMZ.
For example, the incoming packet will be checked with Firewall rules, Virtual Server rules and
then
DMZ
host.
