Zyxel P-660HN-T1A Router Manual PDF (Setup & Configuration Guide)

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Chapter 9 Network Address Translation (NAT)

P-660HN-TxA User’s Guide

141

9.3.2

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.

Figure 67

Network > NAT > Port Forwarding: Edit

The following table describes the fields in this screen.

Table 43

Network > NAT > Port Forwarding: Edit

LABEL

DESCRIPTION

Rule Setup

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.

Port

Translation

Start / End

Port

Enter the start port number here to which you want the device to

translate the incoming port. For a range of ports, you only need to enter

the first number of the range to which you want the incoming ports

translated, the device automatically calculates the last port of the

translated port range.

Back

Click this to return to the previous screen without saving.

Page 142 / 324

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9.4

The Address Mapping Screen

Note: 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 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 68

Network > NAT > Address Mapping

Apply

Click this to save your changes.

Cancel

Click this to restore your previously saved settings.

Table 43

Network > NAT > Port Forwarding: Edit

(continued)

LABEL

DESCRIPTION

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The following table describes the fields in this screen.

Table 44

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 / 324

Chapter 9 Network Address Translation (NAT)

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9.4.1

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 69

Network > NAT > Address Mapping: Edit

The following table describes the fields in this screen.

Table 45

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.

Page 145 / 324

Chapter 9 Network Address Translation (NAT)

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9.5

The 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 70

Network > NAT > ALG

The following table describes the fields in this screen.

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

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.

Apply

Click this to save your changes.

Cancel

Click this to restore your previously saved settings.

Table 45

Network > NAT > Address Mapping: Edit

(continued)

LABEL

DESCRIPTION

Table 46

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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