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LTE TDD B2268H
User Guide
9 Dynamic DNS
Issue 01 (2014-01-15)
Copyright © Huawei Technologies Co., Ltd.
74
9
Dynamic DNS
9.1 Overview
This chapter discusses how to configure your LTE Device to use Dynamic DNS. Dynamic DNS
allows you to update your current dynamic IP address with one or many dynamic DNS services
so that anyone can contact you (in applications such as NetMeeting and CU-SeeMe). You can
also access your FTP server or Web site on your own computer using a domain name (for
instance myhost.dhs.org, where myhost is a name of your choice) that will never change instead
of using an IP address that changes each time you reconnect. Your friends or relatives will
always be able to call you even if they don't know your IP address.
First of all, you need to have registered a dynamic DNS accou
nt with www.dyndns.org
. This is
for people with a dynamic IP from their ISP or DHCP server that would still like to have a
domain name. The Dynamic DNS service provider will give you a password or key.
9.1.1 What You Need To Know
DYNDNS Wildcard
Enabling the wildcard feature for your host causes *.yourhost.dyndns.org to be aliased to the
same IP address as yourhost.dyndns.org. This feature is useful if you want to be able to use, for
example,
www.yourhost.dyndns.org
and still reach your hostname.
If you have a private WAN IP address, then you cannot use Dynamic DNS.
9.2 The Dynamic DNS Screen
Use the
Dynamic DNS
screen to enable DDNS and configure the DDNS settings on the LTE
Device. To change your LTE Device's DDNS, click
Network Setting > Dynamic DNS
. The
screen appears as shown.
Page 82 / 155
LTE TDD B2268H
User Guide
9 Dynamic DNS
Issue 01 (2014-01-15)
Copyright © Huawei Technologies Co., Ltd.
75
Figure 9-1
Network Setting > Dynamic DNS
The following table describes the fields in this screen.
Table 9-1
Network Setting > DNS
LABEL
DESCRIPTION
Dynamic DNS Configuration
Active Dynamic
DNS
Select this check box to use dynamic DNS.
Service Provider
Select the name of your Dynamic DNS service provider.
Dynamic DNS
Type
Select the type of service that you are registered for from your Dynamic
DNS service provider.
Host Name
Type the domain name assigned to your LTE Device by your Dynamic
DNS provider.
You can specify up to two host names in the field separated by a
comma (",").
User Name
Type your user name.
Password
Type the password assigned to you.
Apply
Click
Apply
to save your changes.
Cancel
Click
Cancel
to restore your previously saved settings.
Page 83 / 155
LTE TDD B2268H
User Guide
10 Firewall
Issue 01 (2014-01-15)
Copyright © Huawei Technologies Co., Ltd.
76
10
Firewall
10.1 Overview
Use the LTE Device firewall screens to enable and configure the firewall that protects your LTE
Device and network from attacks by hackers on the Internet and control access to it. By default
the firewall:
Allows traffic that originates from your LAN and WLAN computers to go to all other
networks.
Blocks traffic that originates on other networks from going to the LAN and WLAN.
The following figure illustrates the default firewall action. User
A
can initiate an IM (Instant
Messaging) session from the LAN to the WAN (
1
). Return traffic for this session is also allowed
(
2
). However other traffic initiated from the WAN is blocked (
3
and
4
).
Figure 10-1
Default Firewall Action
10.1.1 What You Need to Know
DoS
Denials of Service (DoS) attacks are aimed at devices and networks with a connection to the
Internet. Their goal is not to steal information, but to disable a device or network so users no
Page 84 / 155
LTE TDD B2268H
User Guide
10 Firewall
Issue 01 (2014-01-15)
Copyright © Huawei Technologies Co., Ltd.
77
longer have access to network resources. The LTE Device is pre-configured to automatically
detect and thwart all known DoS attacks.
Firewall
The LTE Device's firewall feature physically separates the LAN/WLAN and the WAN and acts
as a secure gateway for all data passing between the networks.
It is designed to protect against Denial of Service (DoS) attacks when activated. The LTE
Device's purpose is to allow a private Local Area Network (LAN) to be securely connected to
the Internet. The LTE Device can be used to prevent theft, destruction and modification of data,
as well as log events, which may be important to the security of your network.
The LTE Device is installed between the LAN/WLAN and a broadband modem connecting to
the Internet. This allows it to act as a secure gateway for all data passing between the Internet
and the LAN.
The LTE Device has one Ethernet WAN port and four Ethernet LAN ports, which are used to
physically separate the network into two areas. The WAN (Wide Area Network) port attaches to
the broadband (cable or DSL) modem to the Internet.
The LAN (Local Area Network) port attaches to a network of computers, which needs security
from the outside world. These computers will have access to Internet services such as e-mail,
FTP and the World Wide Web. However, "inbound access" is not allowed (by default) unless
the remote host is authorized to use a specific service.
Enabling the firewall may impact the system performance.
ICMP
Internet Control Message Protocol (ICMP) is a message control and error-reporting protocol
between a host server and a gateway to the Internet. ICMP uses Internet Protocol (IP) datagrams,
but the messages are processed by the TCP/IP software and directly apparent to the application
user.
Finding Out More
See Section 11.6 for advanced technical information on firewall.
10.2 The General Screen
Use this screen to enable or disable the LTE Device's firewall. Click
Security > Firewall
to
open the
General
screen.
Page 85 / 155
LTE TDD B2268H
User Guide
10 Firewall
Issue 01 (2014-01-15)
Copyright © Huawei Technologies Co., Ltd.
78
Figure 10-2
Security > Firewall > General
The following table describes the labels in this screen.
Table 10-1
Security > Firewall > General
LABEL
DESCRIPTION
Firewall
Select
Enable
to activate the firewall. The LTE Device performs
access control and protects against Denial of Service (DoS) attacks
when the firewall is activated.
Easy, Medium,
High
Select
Easy
to have the firewall allow both LAN-to-WAN and
WAN-to- LAN traffic to flow through the LTE Device.
Select
Medium
to have the firewall only allow traffic sent from the
LAN
to the WAN. All traffic sent or access from the WAN will be blocked.
Select
High
to have the firewall only allow Telnet, FTP, HTTP,
HTTPS, DNS, POP3, and SMTP traffic sent from the LAN to the
WAN. Other traffic will be blocked.
Apply
Click
Apply
to save your changes.
Cancel
Click
Cancel
to restore your previously saved settings.
10.3 The Services Screen
Use this screen to view the configured service list. To access this screen, click
Security >
Firewall > Services
. You have to configure at least one service in this screen before
configuring the
Security > Firewall > Access Control > Add New ACL Rule/Edit
screen.

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