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WebShare 111/141
A02-RA111 / A02-RA141
Pag. 47
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.
Services
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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7.3.2 Virtual Server
Click on
Advanced Setup
then
NAT
.
Click on
Virtual Server
.
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The following table describes the labels in this screen.
Label
Description
Start Port No.
Enter a port number in this field.
To forward only one port, enter the port number again in the
End Port No. field.
To forward a series of ports, enter the start port number here
and the end port number in the End Port No. field.
End Port No.
Enter a port number in this field.
To forward only one port, enter the port number again in the
Start Port No. field above and then enter it again in this field.
To forward a series of ports, enter the last port number in a
series that begins with the port number in the Start Port No.
field above.
IP Address
Enter your server IP address in this field.
Let's say you want to assign ports 22-25 to one server, port 80 to another and
assign a default server IP address of 192.168.1.35 as shown in the next figure.
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7.4 Selecting the NAT Mode
Click
Advanced Setup
then
NAT
to open the following screen chose
Multiple
(
Numbers of IP)
.
Click on
IP Address Mapping
(for Multiple IPs Service).
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Ordering your rules is important because the ADSL Router applies the rules in the
order that you specify. When a rule matches the current packet, the ADSL Router
takes the corresponding action and the remaining rules are ignored. If there are
any empty rules before your new configured rule, your configured rule will be
pushed up by that number of empty rules. For example, if you have already
configured rules 1 to 6 in your current set and now you configure rule number 9.
In the set summary screen, the new rule will be rule 7, not 9. Now if you delete
rule 4, rules 5 to 7 will be pushed up by 1 rule, so old rules 5, 6 and 7 become
new rules 4, 5 and 6.
To change the ADSL Router’s address mapping settings.
The following table describes the labels in this screen.
Label
Description
Rule Index
Chose the number
Rule Type
1-1: One-to-one mode maps one local IP address to one
global IP address. Note that port numbers do not change for
the One-to-one NAT mapping type.
M-1: Many-to-One mode maps multiple local IP addresses to
one global IP address.
M-M Ov (Overload): Many-to-Many Overload mode maps
multiple local IP addresses to shared global IP addresses.
MM No (No Overload): Many-to-Many No Overload mode
maps each local IP address to unique global IP addresses.
Server(available on next release of firmware): This type allows
you to specify inside servers of different services behind the
NAT to be accessible to the outside world.
Local Start IP
This is the starting Inside Local IP Address (ILA). Local IP
addresses are N/A for Server port mapping.
Local End IP
This is the end Inside Local IP Address (ILA). If your rule is for
all local IP addresses, then enter 0.0.0.0 as the Local Start IP
address and 255.255.255.255 as the Local End IP address.
This field is N/A for One-to-one and Server mapping types.
Public Start IP
This is the starting Inside Global IP Address (IGA). Enter
0.0.0.0 here if you have a dynamic IP address from your ISP.
You can only do this for Many-to-One and Server mapping
types.
Public End IP
This is the ending Inside Global IP Address (IGA). This field is
N/A for One-to-one, Many-to-One and Server mapping types.

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