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Page 141 / 421 Scroll up to view Page 136 - 140
Chapter 8 Network Address Translation (NAT)
P-660HN-FxZ Series User’s Guide
139
Figure 72
Network > NAT > Port Forwarding
The following table describes the fields in this screen.
8.3.2
The Port Forwarding Rule Edit Screen
Use this screen to edit a port forwarding rule. Click the rule’s edit icon in the
Port
Forwarding
screen to display the screen shown next.
Table 45
Network > NAT > Port Forwarding
LABEL
DESCRIPTION
Default Server Setup
Default Server
In addition to the servers for specified services, NAT supports a default server. A
default server receives packets from ports that are not specified in this screen. If
you do not assign a
Default Server
IP address, the ZyXEL Device discards all
packets received for ports that are not specified here or in the remote management
setup.
Port Forwarding
Service Name
Select a service from the drop-down list box.
Server IP
Address
Enter the IP address of the server for the specified service.
Add
Click this button to add a rule to the table below.
#
This is the rule index number (read-only).
Active
This field indicates whether the rule is active or not.
Clear the check box to disable the rule. Select the check box to enable it.
Service Name
This is a service’s name.
Start Port
This is the first port number that identifies a service.
End Port
This is the last port number that identifies a service.
Server IP
Address
This is the server’s IP address.
Modify
Click the edit icon to go to the screen where you can edit the port forwarding rule.
Click the delete icon to delete an existing port forwarding rule. Note that
subsequent address mapping rules move up by one when you take this action.
Apply
Click this to save your changes.
Cancel
Click this to restore your previously saved settings.
Page 142 / 421
Chapter 8 Network Address Translation (NAT)
P-660HN-FxZ Series User’s Guide
140
Figure 73
Network > NAT > Port Forwarding: Edit
The following table describes the fields in this screen.
8.4
The Address Mapping Screen
"
The
Address Mapping
screen is available only when you select
Full Feature
in the
NAT > General
screen.
Ordering your rules is important because the ZyXEL Device applies the rules in the order that
you specify. When a rule matches the current packet, the ZyXEL Device 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
Table 46
Network > NAT > Port Forwarding: Edit
LABEL
DESCRIPTION
Active
Click this check box to enable the rule.
Service Name
Enter a name to identify this port-forwarding rule.
Start Port
Enter a port number in this field.
To forward only one port, enter the port number again in the
End Port
field.
To forward a series of ports, enter the start port number here and the end port
number in the
End Port
field.
End Port
Enter a port number in this field.
To forward only one port, enter the port number again in the
Start
Port
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
field above.
Server IP
Address
Enter the inside IP address of the server here.
Back
Click this to return to the previous screen without saving.
Apply
Click this to save your changes.
Cancel
Click this to restore your previously saved settings.
Page 143 / 421
Chapter 8 Network Address Translation (NAT)
P-660HN-FxZ Series User’s Guide
141
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 your ZyXEL Device’s address mapping settings, click
Network > NAT > Address
Mapping
to open the following screen.
Figure 74
Network > NAT > Address Mapping
The following table describes the fields in this screen.
Table 47
Network > NAT > Address Mapping
LABEL
DESCRIPTION
#
This is the rule index number.
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 the rule is for all local IP addresses,
then this field displays 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.
Global 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.
Global 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.
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.
This is equivalent to SUA (i.e., PAT, port address translation), ZyXEL's Single User
Account feature that previous ZyXEL routers supported only.
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
: This type allows you to specify inside servers of different services behind
the NAT to be accessible to the outside world.
Modify
Click the edit icon to go to the screen where you can edit the address mapping rule.
Click the delete icon to delete an existing address mapping rule. Note that
subsequent address mapping rules move up by one when you take this action.
Page 144 / 421
Chapter 8 Network Address Translation (NAT)
P-660HN-FxZ Series User’s Guide
142
8.4.1
The Address Mapping Rule Edit Screen
Use this screen to edit an address mapping rule. Click the rule’s edit icon in the
Address
Mapping
screen to display the screen shown next.
Figure 75
Network > NAT > Address Mapping: Edit
The following table describes the fields in this screen.
Table 48
Network > NAT > Address Mapping: Edit
LABEL
DESCRIPTION
Type
Choose the port mapping type from one of the following.
One-to-One
: One-to-One mode maps one local IP address to one global IP
address. Note that port numbers do not change for One-to-one NAT mapping type.
Many-to-One
: Many-to-One mode maps multiple local IP addresses to one global IP
address. This is equivalent to SUA (i.e., PAT, port address translation), ZyXEL's
Single User Account feature that previous ZyXEL routers supported only.
Many-to-Many Overload
: Many-to-Many Overload mode maps multiple local IP
addresses to shared global IP addresses.
Many-to-Many No Overload
: Many-to-Many No Overload mode maps each local IP
address to unique global IP addresses.
Server
: 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 local IP address (ILA). Local IP addresses are
N/A
for
Server
port
mapping.
Local End IP
This is the end 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.
Global Start IP
This is the starting global IP address (IGA). Enter 0.0.0.0 here if you have a dynamic
IP address from your ISP.
Global End IP
This is the ending global IP address (IGA). This field is
N/A
for
One-to-One
,
Many-
to-One
and
Server
mapping types.
Server Mapping
Set
Only available when
Type
is set to
Server
.
Select a number from the drop-down menu to choose a port forwarding set.
Edit Details
Click this link to go to the
Port Forwarding
screen to edit a port forwarding set that
you have selected in the
Server Mapping Set
field.
Back
Click this to return to the previous screen without saving.
Page 145 / 421
Chapter 8 Network Address Translation (NAT)
P-660HN-FxZ Series User’s Guide
143
8.5
The SIP ALG Screen
Some NAT routers may include a SIP Application Layer Gateway (ALG). A SIP ALG allows
SIP calls to pass through NAT by examining and translating IP addresses embedded in the
data stream. When the ZyXEL Device registers with the SIP register server, the SIP ALG
translates the ZyXEL Device’s private IP address inside the SIP data stream to a public IP
address. You do not need to use STUN or an outbound proxy if your ZyXEL Device is behind
a SIP ALG.
Use this screen to enable and disable the SIP (VoIP) ALG in the ZyXEL Device. To access this
screen, click
Network > NAT > ALG
.
Figure 76
Network > NAT > ALG
The following table describes the fields in this screen.
8.6
NAT Technical Reference
This chapter contains more information regarding NAT.
8.6.1
NAT Definitions
Inside/outside denotes where a host is located relative to the ZyXEL Device, for example, the
computers of your subscribers are the inside hosts, while the web servers on the Internet are
the outside hosts.
Apply
Click this to save your changes.
Cancel
Click this to restore your previously saved settings.
Table 48
Network > NAT > Address Mapping: Edit
(continued)
LABEL
DESCRIPTION
Table 49
Network > NAT > ALG
LABEL
DESCRIPTION
Enable SIP ALG
Select this to make sure SIP (VoIP) works correctly with port-forwarding and
address-mapping rules.
Apply
Click this to save your changes.
Reset
Click this to restore your previously saved settings.

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