Digitus Internet Broadband Router with 4 Port N-Way Switch DN-11004-O ユーザーズマニュアル

 

 

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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. 

 

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    Printer Server allow networked 

 sharing the same printer on the network, only the networked   

PC has printer driver without physical connection directly with printer. 

 

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    Domain Name System Server is a server that matches URLs (such as www.router-net.com) to   

numeric IP addresses. DDNS 

 

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    Transmission Control Protocol (TCP) with Internet Protocol (IP). The main internetworking   

protocol used in the Internet. 

 

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  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. 

 

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   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. 

 

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    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.