LTE TDD B2268H

User Guide

7 Routing

Issue 01 (2014-01-15)

Copyright © Huawei Technologies Co., Ltd.

64

Figure 7-2

Network Setting >StaticRoute

The following table describes the labels in this screen.

Table 7-1

Network Setting > Static Route

LABEL

DESCRIPTION

Add New

Static Route

Click this to set up a new IPv4 static route on the LTE Device.

#

This is the number of an individual static route.

Active

This indicates whether the route is active or not.

A yellow bulb signifies that this static route is active. A gray bulb

signifies that this static route is not active.

Status

This shows whether the static route is currently in use or not. A yellow

bulb signifies that this static route is in use. A gray bulb signifies that this

static route is not in use.

Name

This is the name that describes or identifies this route.

Destination IP

This parameter specifies the IPv4 IP network address of the final

destination. Routing is always based on network number.

Gateway

This is the IPv4 IP address of the gateway. The gateway is a router or

switch on the same network segment as the device's LAN or WAN port.

The gateway helps forward packets to their destinations.

Subnet Mask

This parameter specifies the IP network subnet mask of the final

destination.

Interface

This indicates which interface handles the traffic forwarded by this

route.

Modify

Click the

Edit

icon to go to the screen where you can set up a static route

on the LTE Device.

Click the

Delete

icon to remove a static route from the LTE Device.

7.2.1 Add/Edit Static Route

Click

add new Static Route

in the

Routing

screen or click the

Edit

icon next to a rule. The

following screen appears. Use this screen to configure the required information for a static

route.

LTE TDD B2268H

User Guide

7 Routing

Issue 01 (2014-01-15)

Copyright © Huawei Technologies Co., Ltd.

65

Figure 7-3

Routing: Add/Edit

The following table describes the labels in this screen.

Table 7-2

Routing: Add/Edit

LABEL

DESCRIPTION

Active

Click this to activate this static route.

Route Name

Enter the name of the IP static route. Leave this field blank to delete this

static route.

Destination IP

Address

This parameter specifies the IP network address of the final destination.

Routing is always based on network number. If you need to specify a

route to a single host, use a subnet mask of 255.255.255.255 in the

subnet mask field to force the network number to be identical to the host

ID.

IP Subnet Mask

Enter the IP subnet mask here.

Gateway IP

Address

You can decide if you want to forward packets to a gateway IP address

or a bound interface.

If you want to configure

Gateway IP Address

, enter the IP address of

the next-hop gateway. The gateway is a router or switch on the same

network segment as the device's LAN or WAN port. The gateway helps

forward packets to their destinations.

Bound

Interface

You can decide if you want to forward packets to a gateway IP address

or a bound interface.

If you want to configure

Bound Interface

, select the check box and

choose an interface through which the traffic is sent.

Apply

Click

Apply

to save your changes.

Back

Click

Back

to exit this screen without saving.

LTE TDD B2268H

User Guide

8 Network Address Translation (NAT)

Issue 01 (2014-01-15)

Copyright © Huawei Technologies Co., Ltd.

66

8

Network Address Translation (NAT)

8.1 Overview

NAT (Network Address Translation - NAT, RFC 1631) is the translation of the IP address of a

host in a packet, for example, the source address of an outgoing packet, used within one

network to a different IP address known within another network.

8.1.1 What You Need To Know

The following terms and concepts may help as you read this chapter.

Inside/Outside and Global/Local

Inside/outside denotes where a host is located relative to the LTE Device, for example, the

computers of your subscribers are the inside hosts, while the web servers on the Internet are the

outside hosts.

Global/local denotes the IP address of a host in a packet as the packet traverses a router, for

example, the local address refers to the IP address of a host when the packet is in the local

network, while the global address refers to the IP address of the host when the same packet is

traveling in the WAN side.

NAT

In the simplest form, NAT changes the source IP address in a packet received from a subscriber

(the inside local address) to another (the inside global address) before forwarding the packet to

the WAN side. When the response comes back, NAT translates the destination address (the

inside global address) back to the inside local address before forwarding it to the original inside

host.

Port Forwarding

A port forwarding 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 NAT makes your whole inside

network appear as a single computer to the outside world.

Finding Out More

See Section 9.5 for advanced technical information on NAT.

LTE TDD B2268H

User Guide

8 Network Address Translation (NAT)

Issue 01 (2014-01-15)

Copyright © Huawei Technologies Co., Ltd.

67

8.2 The Port Forwarding Screen

Use the

Port Forwarding

screen 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. You can allocate a server IP address that corresponds to a port

or a range of ports.

Please refer to RFC 1700 for further information about port numbers.

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 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.

Configuring Servers Behind Port Forwarding (Example)

Let's say you want to assign ports 21-25 to one FTP, Telnet and SMTP server (

A

in the example),

port 80 to another (

B

in the example) and assign a default server IP address of 10.0.0.35 to a

third (

C

in the example). You assign the LAN IP addresses and the ISP assigns the WAN IP

address. The NAT network appears as a single host on the Internet.

Figure 8-1

Multiple Servers Behind NAT Example

8.2.1 The Port Forwarding Screen

Click

Network Setting > NAT

to open the Port Forwarding screen.

Figure 8-2

Network Setting >NAT >Port Forwarding

The following table describes the fields in this screen.

LTE TDD B2268H

User Guide

8 Network Address Translation (NAT)

Issue 01 (2014-01-15)

Copyright © Huawei Technologies Co., Ltd.

68

Table 8-1

Network Setting > NAT > Port Forwarding

LABEL

DESCRIPTION

Add new rule

Click this to add a new port forwarding rule.

#

This is the index number of the entry.

Status

This field indicates whether the rule is active or not.

A yellow bulb signifies that this rule is active. A gray bulb signifies that

this rule is not active.

Service Name

This is the service's name. This shows

User Defined

if you manually

added a service. You can change this by clicking the edit icon.

WAN Interface

This shows the WAN interface through which the service is forwarded.

Start Port

This is the first external port number that identifies a service.

End Port

This is the last external port number that identifies a service.

Translation Start

Port

This is the first internal port number that identifies a service.

Translation End

Port

This is the last internal port number that identifies a service.

Server IP Address

This is the server's IP address.

Protocol

This shows the IP protocol supported by this virtual server, whether it

is TCP, UDP, or TCP/UDP.

Modify

Click the

Edit

icon to 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

Apply

to save your changes.

Cancel

Click

Cancel

to restore your previously saved settings.

8.2.2 The Port Forwarding Edit Screen

This screen lets you create or edit a port forwarding rule. Click

Add new rule

in the

Port

Forwarding

screen or the

Edit

icon next to an existing rule to open the following screen.