Atlantis WebShare-141-WN+ Router Manual PDF (Setup & Configuration Guide)

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6.1.4

NAT Application

The following figure illustrates a possible NAT application, where three inside LANs

(logical LANs using IP Alias) behind the ADSL Router can communicate with three

distinct WAN networks. More examples follow at the end of this chapter.

6.1.5

NAT Mapping Types

NAT supports five types of IP/port mapping. They are:



One to One:

In One-to-One mode, the ADSL Router maps one local IP

address to one global IP address.



Many to One:

In Many-to-One mode, the ADSL Router maps multiple

local IP addresses to one global IP address.



Many to Many Overload:

In Many-to-Many Overload mode, the ADSL

Router maps the multiple local IP addresses to shared global IP

addresses.



Many-to-Many No Overload:

In Many-to-Many No Overload mode,

the ADSL Router maps each local IP address to a unique global IP

address.



Server:

This type allows you to specify inside servers of different

services behind the NAT to be accessible to the outside world.

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The following table summarizes these types:

Type

IP Mapping

One-to-One

ILA1

IGA1

Many-to-One (SUA/PAT)

ILA1

IGA1

ILA2

IGA1

…

Many-to-Many Overload

ILA1

IGA1

ILA2

IGA2

ILA3

IGA1

ILA4

IGA2

…

Many-to-Many No Overload

ILA1

IGA1

ILA2

IGA2

ILA3

IGA3

…

Server

Server 1 IP

IGA1

Server 2 IP

IGA1

Server 3 IP

IGA1

6.2

SUA (Single User Account) Versus NAT

SUA (Single User Account) is a implementation of a subset of NAT that supports two

types of mapping, Many-to-One and Server. The ADSL Router also supports Full

Feature NAT to map multiple global IP addresses to multiple private LAN IP

addresses of clients or servers using mapping types as outlined in.

6.3

Virtual Server and DMZ

A Virtual server set is a list of inside (behind NAT on the LAN) servers, for example,

web or FTP, that you can make visible to the outside world even though SUA makes

your whole inside network appear as a single computer to the outside world.

You may enter a single port number or a range of port numbers to be forwarded,

and the local IP address of the desired server. The port number identifies a service;

for example, web service is on port 80 and FTP on port 21. In some cases, such as

for unknown services or where one server can support more than one service (for

example both FTP and web service), it might be better to specify a range of port

numbers. You can allocate a server IP address that corresponds to a port or a range

of ports.

Many residential broadband ISP accounts do not allow you to run any server

processes (such as a Web or FTP server) from your location. Your ISP may

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periodically check for servers and may suspend your account if it discovers any

active services at your location. If you are unsure, refer to your ISP.

Default Server IP Address

In addition to the servers for specified services, NAT supports a default server IP

address. A default server receives packets from ports that are not specified in this

screen.

6.3.1

Port Forwarding: Services and Port Numbers

A NAT server set is a list of inside (behind NAT on the LAN) servers, for example,

web or FTP, that you can make accessible to the outside world even though NAT

makes your whole inside network appear as a single machine to the outside world.

Use the SUA Server page to forward incoming service requests to the server(s) on

your local network. You may enter a single port number or a range of port numbers

to be forwarded, and the local IP address of the desired server. The port number

identifies a service; for example, web service is on port 80 and FTP on port 21. In

some cases, such as for unknown services or where one server can support more

than one service (for example both FTP and web service), it might be better to

specify a range of port numbers.

In addition to the servers for specified services, NAT supports a default server. A

service request that does not have a server explicitly designated for it is forwarded

to the default server. If the default is not defined, the service request is simply

discarded.

The most often used port numbers are shown in the following table. Please refer to

RFC 1700 for further information about port numbers.

Application

Outcoming Connections

Incoming Connections

ICQ 98, 99a

Nessuno

NetMeeting 2.1 a 3.01

Nessuno

1503 TCP, 1720 TCP

VDO Live

Nessuno

mIRC

Nessuno

Cu-SeeMe

7648 TCP &UDP, 24032

UDP

7648 TCP &UDP, 24032

UDP

PC AnyWhere

5632 UDP, 22 UDP, 5631

TCP, 65301 TCP

5632 UDP, 22 UDP, 5631

TCP, 65301 TCP

Edonkey/Emule

Nessuno

principalmente 4660-4662

TCP , 4665-4672 UDP

MSN Messanger

Nessuno

TCP da 6891-6900

TCP 1863

TCP 6901

UDP 1863

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UDP 6901

UDP 5190

VNC

Nessuno

TCP 5900

Service

Port Number / Protocol

File Transfer Protocol (FTP) Data

20/tcp

FTP Commands

21/tcp

Telnet

23/tcp

Simple Mail Transfer Protocol (SMTP)

Email

25/tcp

Domain Name Server (DNS)

53/tcp and 53/udp

Trivial File Transfer Protocol (TFTP)

69/udp

finger

79/tcp

World Wide Web (HTTP)

80/tcp

POP3 Email

110/tcp

SUN Remote Procedure Call (RPC)

111/udp

Network News Transfer Protocol

(NNTP)

119/tcp

Network Time Protocol (NTP)

123/tcp and 123/udp

News

144/tcp

Simple Management Network Protocol

(SNMP)

161/udp

SNMP (traps)

162/udp

Border Gateway Protocol (BGP)

179/tcp

Secure HTTP (HTTPS)

443/tcp

rlogin

513/tcp

rexec

514/tcp

talk

517/tcp and 517/udp

ntalk

518/tcp and 518/udp

Open Windows

2000/tcp and 2000/udp

Network File System (NFS)

2049/tcp

X11

6000/tcp and 6000/udp

Routing Information Protocol (RIP)

520/udp

Layer 2 Tunnelling Protocol (L2TP)

1701/udp

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6.3.2

Virtual Server

Click on

Advanced Setup

then

NAT

.

Click on

Virtual Server

.

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