D-Link DSL-520B User Manual

41D-Link DSL-520B ADSL2+ Modem User Manual
Section 7 - Device Info
NAT - Virtual Server Setup
Bydefault,DSLrouterblocksallexternalusersfromconnectingtoorcommunicatingwithyournetwork.Therefore,thesystem
is safe from hackers whom may try to intrude into the network and damage it.
However,you maywantto expose your networkto the Internetinlimitedandcontrolledways in ordertoenablesome
applicationstoworkfromtheLAN(forexample,game,voice,andchatapplications)andtoenableInternetaccesstoservers
in the home network. The port forwarding feature supports both functions. This topic is also referred as Local Servers.
TheportforwardingpageisusedtodeneapplicationsthatrequirespecialhandlingbyDSLrouter.Allyouneedtodoisto
selecttheapplicationprotocolandthelocalIPaddressofthecomputerthatisusingorprovidingtheservice.Ifrequired,you
may add new protocols in addition to the most common ones provided by DSL router.
Forexample,ifyouwantedtousealetransferprotocol(FTP)applicationononeofyourPCs,youwouldsimplyselectFTP
from the list and enter the local IP address or host name of the designated computer. All FTP-related data arriving at DSL router
from the Internet henceforth is forwarded to the specic computer.
Similarly,youcangrantInternetusersaccesstoserversinsideyourhomenetwork,byidentifyingeachserviceandthePCthat
provideit.Thisisuseful,forexample,ifyouwanttohostaWebserverinsideyourhomenetwork.WhenanInternetuserpoints
his/herbrowsertoDSLrouterexternalIPaddress,thegatewayforwardstheincomingHTTPrequesttoyourWebserver.With
oneexternalIPaddress(DSLroutermainIPaddress),dierentapplicationscanbeassignedtoyourLANcomputers,however
each type of application is limited to use one computer.
Forexample,youcandenethatFTPusesaddressXtoreachcomputerAandTelnetalsousesaddressXtoreachomputerA.
ButattemptingtodeneFTPtouseaddressXtoreachbothcomputerAandBfails.DSLrouter,therefore,providestheability
toaddadditionalpublicIPaddressestoportforwardingrules,whichyoumustobtainfromyourISP,andenterintotheIP
addressespool.Then,youcandeneFTPtouseaddressXtoreachcomputerAandaddressYtoreachcomputerB.

D-Link DSL-520B Specifications

Data Transfer Rates

G.dmt full rate downstream	up to 8 Mbps
G.dmt full rate upstream	up to 1 Mbps
G.lite downstream	up to 1.5 Mbps
G.lite upstream	up to 512 Kbps
G.dmt.bis full rate downstream	up to 12 Mbps
G.dmt.bis full rate upstream	up to 12 Mbps
ADSL full rate downstream	up to 24 Mbps
ADSL full rate upstream	up to 1 Mbps

Interfaces

ADSL interface	RJ-11 connector
LAN interface	RJ-45 port
Ethernet	10/100BASE-T