Technical information

Watson-SHDSL-Router-GUI-Manual.doc
Version 2.3-03
Watson SHDSL Router
Web-based Management Manual
Revision: 2012-02-29
8-17
NAT Addresses The NAT address into which the original IP address will be trans-
lated. The combo box displays all of your available NAT addresses/ranges, from
which you can select an entry. If you would like to add a single address or a sub-
range from the given pool/range, select the 'User Defined' option in the combo box.
Similarly, this will commence a sequence that will add a new network object.
NAPT Address The NAPT address into which the original IP address will be trans-
lated. The combo box displays all of your available NAPT addresses/ranges, from
which you can select an entry. If you would like to add a single address or a sub-
range from the given pool/range, select the 'User Defined' option in the combo box.
Similarly, this will commence a sequence that will add a new network object. Note,
however, that in this case the network object may only be an IP address, as NAPT
is port-specific.
NAPT Ports Specify the port(s) of the IP address into which the original IP ad-
dress will be translated. Enter a single port or select 'Range' in the combo box. The
screen will refresh, enabling you to enter a range of ports.
Logging Monitor the rule.
 Log Packets Matched by This Rule Select this check box to log the first
packet from a connection that was matched by this rule.
Schedule By default, the rule will always be active. However, you can configure
scheduler rules by selecting 'User Defined', in order to define time segments during
which the rule may be active. To learn how to configure scheduler rules, refer to
Section 9.9.3.
Using a protocol requires observing the relationship between a client and a server, in
order to distinguish between the source and destination ports. For example, let's as-
sume you have an FTP server in your LAN, serving clients inquiring from the WAN.
You want to apply a NAPT rule on incoming packets from any port on the WAN (cli-
ents) trying to access FTP port 21 (your server), and the same for outgoing packets
from port 21 trying to access any port on the WAN. Therefore, you must set the fol-
lowing QoS rules:
 In the 'Matching' section of 'NAT/NAPT Rules', set the 'Protocol' drop-
down menu to: TCP Any -> 21 (available as a predefined service, named
FTP).
 In the 'Operation' section of 'NAT/NAPT Rules', select ‗NAPT‘.
8.2.7.2 Using NAT/NAPT
This section demonstrates the NAT/NAPT usage and capabilities, by creating sev-
eral rules and observing their implementation.