AOpen 4-Port 10/100Mbps Ethernet Broadband Router Uživatelský manuál stáhnout pdf (Strana 37)

EE400-R GigaFast Ethernet.

P 36

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4.4 Virtual Server

Generall

, NAT based routers/firewalls filter out all unreco

nized packets from the WAN to protect

our

Internal LAN computers; therefore, all LAN computers behind the EE400-R are invisible to the outside

Internet. However, some Internet servers (like WWW, FTP, E-mail) should be visible and accessible

by the outside Internet. As a result, the EE400-R provides Virtual Server functions to meet this demand. In

addition, the EE400-R also protects the servers and all other computers in the LAN simultaneousl

Since all the Internet servers always handle the fixed TCP/UDP service port number (like WWW is 80,

FTP is 21) any packets from the WAN which have a destination port number that matches a virtual

server’s port, then these packets will be forwarded to the pre-defined LAN’s IP. The destination

port number is also kept the same.

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AOpen 4-Port 10/100Mbps Ethernet Broadband Router Uživatelský manuál Strana 37