Asus RX3042H User manual

RX3042H
User's Manual
Revision 0.8
May 12, 2005

2

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Table of Contents
1 Introduction ............................................................1
1.1 Features ....................................................................1
1.2 System Requirements ...............................................1
1.3 Using this Document .................................................2
1.3.1 Notational conventions ............................................... 2
1.3.2 Typographical conventions ......................................... 2
1.3.3 Special messages ...................................................... 2
2 Getting to Know RX3042H ....................................3
2.1 Parts List ...................................................................3
2.2 Hardware Features ....................................................3
2.3 Software Features .....................................................3
2.3.1 NAT Features ............................................................. 3
2.3.2 Firewall Features ........................................................ 4
2.3.2.1 Stateful Packet Inspection .................................. 4
2.3.2.2 Packet Filtering – ACL (Access Control List) ...... 4
2.3.2.3 Defense against DoS Attacks ............................. 5
2.3.2.4 Application Level Gateway (ALG) ....................... 6
2.3.2.5 Log ...................................................................... 6
2.4 Finding Your Way Around ..........................................7
2.4.1 Front Panel ................................................................. 7
2.4.2 Rear Panel ................................................................. 8
2.4.3 Bottom View ............................................................... 9
2.5 Placement Options ....................................................9
2.5.1 Desktop Placement .................................................... 9
2.5.2 Wall Mount Instructions: ............................................. 9
3 Quick Start Guide ................................................ 11

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3.1 Part 1 — Connecting the Hardware ........................11
3.1.1 Step 1. Connect an ADSL or a cable modem ............11
3.1.2 Step 2. Connect computers or a Network ................ 12
3.1.3 Step 3. Attach the AC adapter .................................. 12
3.1.4 Step 4. Power on RX3042H, the ADSL or cable
modem and power up your computers .................... 12
3.2 Part 2 — Configuring Your Computers ....................13
3.2.1 Before you begin ...................................................... 13
3.2.2 Windows® XP PCs: .................................................. 13
3.2.3 Windows® 2000 PCs: ............................................. 14
3.2.4 Windows® 95, 98, and ME PCs ............................... 15
3.2.5 Windows® NT 4.0 workstations: .............................. 16
3.2.6 Assigning static IP addresses to your PCs ............... 17
3.3 Part 3 — Quick Configuration of the RX3042H .......19
3.3.1 Setting Up the RX3042H .......................................... 19
3.3.2 Testing Your Setup ................................................... 21
3.3.3 Default Router Settings ............................................ 21
4 Using the Configuration Manager ......................23
4.1 Log into the Configuration Manager ........................23
4.2 Functional Layout ....................................................24
4.2.1 Menu Navigation ...................................................... 25
4.2.2 Commonly Used Buttons and Icons ......................... 25
4.3 Overview of System Configuration ..........................26
5 Router Setup ........................................................27
5.1 LAN Configuration ...................................................27
5.1.1 LAN IP Address ........................................................ 27
5.1.2 LAN Configuration Parameters ................................ 27
5.1.3 Configuring the LAN IP Address ............................... 28
5.2 WAN/DMZ Configuration .........................................29

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5.2.1 WAN Connection Mode ............................................ 29
5.2.2 PPPoE ...................................................................... 30
5.2.2.1 WAN PPPoE Configuration Parameters ........... 31
5.2.2.2 Configuring PPPoE for WAN ............................ 32
5.2.3 PPPoE Unnumbered ................................................ 33
5.2.3.1 WAN PPPoE Unnumbered Configuration
Parameters ....................................................... 34
5.2.3.2 Configuring PPPoE Unnumbered for WAN ...... 35
5.2.4 Dynamic IP ............................................................... 36
5.2.4.1 Configuring Dynamic IP for WAN ...................... 36
5.2.5 Static IP .................................................................... 37
5.2.5.1 WAN or DMZ Static IP Configuration Parameters 37
5.2.5.2 Configuring Static IP for WAN or DMZ .............. 38
5.2.6 PPTP ........................................................................ 39
5.2.6.1 WAN PPTP Configuration Parameters ............. 39
5.2.6.2 Configuring PPTP for WAN ............................... 41
5.3 WAN Load Balancing and Line Back Up ..................41
5.3.1 WAN Load Balancing and Line Back Up Configuration
Parameters .............................................................. 42
5.3.2 Setting Up WAN Load Balancing ............................ 43
5.3.3 Setting Up WAN Line Back Up ................................. 44
6 DHCP Server Configuration ................................45
6.1 DHCP (Dynamic Host Control Protocol) ..................45
6.1.1 What is DHCP? ........................................................ 45
6.1.2 Why use DHCP? ...................................................... 45
6.1.3 Configuring DHCP Server ........................................ 46
6.1.4 Viewing Current DHCP Address Assignments ......... 48
6.1.5 Fixed DHCP Lease ................................................... 48
6.1.5.1 Access Fixed DHCP Configuration Page –
(Advanced ->DHCP Server) ............................. 48

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6.1.5.2 Add a Fixed DHCP Lease ................................. 49
6.1.5.3 Delete a Fixed DHCP Lease ............................. 49
6.1.5.4 Viewing Fixed DHCP Lease Table .................... 49
6.2 DNS .........................................................................50
6.2.1 About DNS .............................................................. 50
6.2.2 Assigning DNS Addresses ....................................... 50
6.2.3 Configuring DNS Relay ............................................ 51
7 Routing .................................................................53
7.1 Overview of IP Routes .............................................53
7.1.1 Do I need to define static routes? ............................ 53
7.2 Dynamic Routing using RIP (Routing Information
Protocol) ..................................................................54
7.2.1 RIP Configuration Parameters ................................. 54
7.2.2 Configuring RIP ........................................................ 55
7.3 Static Route .............................................................56
7.3.1 Static Route Configuration Parameters .................... 56
7.3.2 Adding Static Routes ................................................ 57
7.3.3 Deleting Static Routes .............................................. 58
7.3.4 Viewing the Static Routing Table .............................. 58
8 Configuring DDNS ...............................................59
8.1 DDNS Configuration Parameters ............................60
8.2 Configuring HTTP DDNS Client ..............................60
9 Configuring Firewall and NAT ............................63
9.1 Firewall Overview ....................................................63
9.1.1 Stateful Packet Inspection ........................................ 63
9.1.2 DoS (Denial of Service) Protection .......................... 64
9.1.3 Firewall and Access Control List (ACL) .................... 64
9.1.3.1 Priority Order of ACL Rule ................................ 64
9.1.3.2 Tracking Connection State ................................ 64

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9.1.4 Default ACL Rules .................................................... 64
9.2 NAT Overview ..........................................................65
9.2.1 NAPT (Network Address and Port Translation) or PAT
(Port Address Translation) ......................................... 65
9.2.2 Reverse NAPT / Virtual Server ................................. 67
9.3 Firewall Settings – (Firewall/NAT ->Settings) ..........67
9.3.1 Firewall Options ....................................................... 67
9.3.2 DoS Configuration .................................................... 67
9.3.2.1 DoS Protection Configuration Parameters ........ 68
9.3.2.2 Configuring DoS Settings ................................. 70
9.4 ACL Rule Configuration Parameters .......................70
9.4.1 ACL Rule Configuration Parameters ........................ 70
9.5 Configuring ACL Rules – (Firewall ->ACL) ..............74
9.5.1 Add an ACL Rule ...................................................... 75
9.5.2 Modify an ACL Rule .................................................. 76
9.5.3 Delete an ACL Rule .................................................. 77
9.5.4 Display ACL Rules .................................................... 77
9.6 Configuring Self-Access ACL Rules –(Firewall/NAT
->Self-Access ACL) .................................................77
9.6.1 Add a Self-Access Rule ............................................ 78
9.6.2 Modify a Self-Access Rule ....................................... 79
9.6.3 Delete a Self-Access Rule ....................................... 79
9.6.4 View Configured Self-Access Rules ......................... 80
9.7 Configure Virtual Server ..........................................80
9.7.1 Virtual Server Configuration Parameters .................. 80
9.7.2 Virtual Server Example 1 – Web Server ................... 83
9.7.3 Virtual Server Example 2 – FTP Server ................... 85
9.8 Configure Special Application ..................................85
9.8.1 Special Application Configuration Parameters ......... 86

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9.8.2 Special Application Example .................................... 87
10 System Management .........................................89
10.1 Configure System Services ...................................89
10.2 Login Password and System Settings ...................90
10.2.1 Changing Password ............................................... 90
10.2.2 Configure System Settings ..................................... 91
10.3 Viewing System Information ..................................91
10.4 Setup Date and Time .............................................92
10.4.1 View the System Date and Time ............................ 93
10.5 SNMP Setup ..........................................................94
10.5.1 SNMP Configuration Parameters ........................... 94
10.5.2 Configuring SNMP .................................................. 94
10.6 Log Setup ...............................................................95
10.6.1 Setting Up Remote Logging Using a Syslog Server .. 95
10.6.2 View the System Log .............................................. 96
10.7 System Configuration Management ......................95
10.7.1 Restore System Configuration to Factory Default
Settings .................................................................. 96
10.7.2 Backup System Configuration ................................ 98
10.7.3 Restore System Configuration ............................... 99
10.8 Firmware Upgrade ...............................................101
10.9 Restart System ....................................................103
10.10 Logout Configuration Manager ...........................104
11 IP Addresses, Network Masks, and Subnets 105
11.1 IP Addresses ........................................................105
11.1.1 Structure of an IP address .................................... 105
11.2 Network classes ..................................................106
11.3 Subnet masks ......................................................107

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12 Troubleshooting ..............................................109
12.1 Diagnosing Problem using IP Utilities ................. 111
12.1.1 ping .......................................................................111
12.1.2 nslookup ................................................................112
13 Index ................................................................. 115
List of Figures
Figure 2.1 Front Panel LEDs .......................................................... 7
Figure 2.2 Rear Panel Connectors ................................................. 8
Figure 3.1 Overview of Hardware Connections ............................ 12
Figure 3.2 Login Screen ............................................................... 19
Figure 3.3 System Status Page .................................................... 20
Figure 4.1 Configuration Manager Login Screen ......................... 24
Figure 4.2 Typical Configuration Manager Page .......................... 25
Figure 4.3 System Status Page .................................................... 26
Figure 5.1 Network Setup Configuration – LAN Configuration ..... 28
Figure 5.2 Network Setup Configuration Page – WAN Configura-
tion .............................................................................. 30
Figure 5.3 WAN – PPPoE Configuration ...................................... 30
Figure 5.4 WAN – PPPoE Unnumbered Configuration ................ 33
Figure 5.5 WAN – Dynamic IP (DHCP client) Configuration ........ 36
Figure 5.6 WAN – Static IP Configuration .................................... 37
Figure 5.7 WAN – PPTP Configuration ........................................ 40
Figure 5.8 Load Balancing Configuration ..................................... 43
Figure 6.1 DHCP Server Configuration Page ............................... 46
Figure 6.2 DHCP Lease Table ...................................................... 48
Figure 6.3 Fixed DHCP Lease Configuration Page ...................... 49

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Figure 7.1 RIP Configuration Page .............................................. 54
Figure 7.2 Static Route Configuration Page ................................ 56
Figure 7.3 Static Route Configuration ......................................... 57
Figure 7.4 Sample Routing Table ................................................ 58
Figure 8.1 Network Diagram for HTTP DDNS .............................. 59
Figure 8.2 HTTP DDNS Configuration Page ................................ 60
Figure 9.1 NAPT – Map Any Internal PCs to a Single Global IP
Address ....................................................................... 66
Figure 9.2 Reverse NAPT – Relayed Incoming Packets to the
Internal Host Base on the Protocol, Port Number or
IP Address ................................................................... 66
Figure 9.3 Firewall General Configuration Page .......................... 70
Figure 9.4 ACL Configuration Page .............................................. 75
Figure 9.5 ACL Configuration Example ........................................ 76
Figure 9.6 Sample ACL List Table ................................................ 76
Figure 9.7 Self-Access ACL Configuration Page .......................... 78
Figure 9.8 Self-Access ACL Configuration Example .................... 79
Figure 9.9 Virtual Server Configuration Page ............................... 80
Figure 9.10 Virtual Server Deployment Topology ......................... 83
Figure 9.11 Virtual Server Example 1 – Web Server .................... 84
Figure 9.12 Adding a New Service ............................................... 84
Figure 9.13 Virtual Server Example 2 – FTP Server .................... 85
Figure 9.14 Special Application Configuration Page .................... 87
Figure 10.1 System Services Configuration Page ........................ 89
Figure 10.2 System Administration Configuration Page ............... 90
Figure 10.3 System Information Page .......................................... 92
Figure 10.4 Time Zone Configuration Page ................................. 93
Figure 10.5 SNMP Configuration Page ........................................ 95
Figure 10.6 Syslog Server Configuration ..................................... 95
Figure 10.7 Sample Log ............................................................... 96

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RX3042H User's Manual Introduction
Figure 10.8 Factory Reset Page .................................................. 97
Figure 10.9 Factory Reset Confirmation ...................................... 97
Figure 10.10 Factory Reset Count Down Timer ........................... 97
Figure 10.11 Backup System Configuration Page ........................ 98
Figure 10.12 Restore System Configuration Page ....................... 99
Figure 10.13 Selecting System Configuration from the File Manager
................................................................................. 100
Figure 10.14 System Configuration Restoration Confirmation ... 100
Figure 10.15 System Reboot Counter Timer .............................. 101
Figure 10.16 Firmware Upgrade Page ....................................... 101
Figure 10.17 Selecting Firmware from the File Manager ........... 102
Figure 10.18 Firmware Upgrade Confirmation ........................... 102
Figure 10.19 Firmware Upgrade Progress ................................. 102
Figure 10.20 System Reboot Count Down Timer for Firmware
Upgrade ................................................................. 103
Figure 10.21 Restart System Page ............................................ 104
Figure 10.22 Configuration Manager Logout Page .................... 104
Figure 10.23 Confirmation for Closing Browser (IE) ................... 104
Figure 12.1 Using the ping Utility ................................................111
Figure 12.2 Using the nslookup Utility .........................................113
List of Tables
Table 2.1 DoS Attacks .................................................................... 5
Table 2.2 Front Panel Label and LEDs ........................................... 7
Table 2.3 Rear Panel Labels and LEDs ......................................... 8
Table 3.1 LED Indicators .............................................................. 13
Table 3.2 Default Settings Summary ............................................ 21
Table 4.1 Description of Commonly Used Buttons and Icons ...... 25

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Introduction RX3042H User's Manual
Table 5.1 LAN Configuration Parameters ..................................... 28
Table 5.2 WAN PPPoE Configuration Parameters ....................... 31
Table 5.3 WAN PPPoE Unnumbered Configuration Parameters . 34
Table 5.4 WAN Static IP Configuration Parameters ..................... 37
Table 5.5 WAN PPTP Configuration Parameters ......................... 39
Table 5.6 WAN Load Balancing and Line Back Up Configuration
Parameters ................................................................... 42
Table 6.1 DHCP Configuration Parameters .................................. 47
Table 6.2 Fixed DHCP Lease Configuration Parameters ............. 49
Table 7.1 Static Route Configuration Parameters ........................ 54
Table 7.2 Static Route Configuration Parameters ........................ 56
Table 8.1 DDNS Configuration Parameters .................................. 60
Table 9.1 Firewall Options Parameters ........................................ 67
Table 9.2 DoS Attack Definition .................................................... 68
Table 9.3 ACL Rule Configuration Parameters ............................. 71
Table 9.4 Service Configuration Parameters ................................ 73
Table 9.5 Virtual Server Configuration Parameters ...................... 81
Table 9.6 Port Numbers for Popular Applications ......................... 82
Table 9.7 Special Application Configuration Parameters .............. 86
Table 9.8 Port Numbers for Popular Applications ......................... 86
Table 10.1 SNMP Configuration Parameters ................................ 94
Table 11.1 IP Address Structure ................................................. 106

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RX3042H User's Manual Introduction
Chapter 1 Introduction
Congratulations on becoming the owner of RX3042H. Your LAN
(local area network) will now be able to access the Internet using
your high-speed broadband connection such as those with ADSL or
cable modem.
This User's Manual will show you how to set up the RX3042H,
and how to customize its configuration to get the most out of this
product.
1.1 Features
• LAN: 4-port Fast Ethernet switch
• WAN: Dual 10/100Base-T Ethernet ports to provide Internet
access for all computers on your LAN
• Firewall, and NAT (Network Address Translation) functions to
provide secure Internet access for your LAN
• Automatic network address assignment through DHCP Server
Services including IP route, DNS and DDNS configuration
• Configuration program accessible via a web browser, such as
Microsoft Internet Explorer 6.0 or newer.
• User configuration dual-WAN or WAN plus DMZ support
• USB storage support (to be supported with firmware upgrade)
1.2 System Requirements
In order to use the RX3042H for Internet access, you must have the
following:
• ADSL or cable modem and the corresponding service up and
running, with at least one public Internet address assigned to
your WAN
• One or more computers each containing an Ethernet 10Base-T
or 100Base-T or 1000Base-T network interface card (NIC)
• (Optional) An Ethernet hub/switch, if you want to connect the
router to more than four computers on an Ethernet network.

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Introduction RX3042H User's Manual
• For system configuration using the web-based GUI: a web
browser such as Internet Explorer 6.0 or newer.
1.3 Using this Document
1.3.1 Notational conventions
• Acronyms are defined the first time they appear in the text.
• For brevity, RX3042H is sometimes referred to as the “router”
or the ”gateway”.
• The terms LAN and network are used interchangeably to refer
to a group of Ethernet-connected computers at one site.
• Sequence of mouse actions is denoted by the “->” character.
For instance, System -> Network Setup means click the
System menu and then click the Network Setup submenu.
1.3.2 Typographical conventions
• Boldface type text is used for items you select from menus
and drop-down lists, and text strings you type when prompted
by the program.
1.3.3 Special messages
This document uses the following icons to call your attention to
specific instructions or explanations.
Note: Provides clarification or non-essential
information on the current topic.
Definition: Explains terms or acronyms that may be
unfamiliar to many readers. These terms are also
included in the Glossary.
Warning: Provides messages of high importance,
including messages relating to personal safety or
system integrity.

RX3042H User's Manual Getting to Know RX3042H
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Chapter 2 Getting to Know RX3042H
2.1 Parts List
In addition to this document, RX3042H should come with the following:
• The system unit
• AC adapter
• Ethernet cable (“straight-through” type)
2.2 Hardware Features
LAN
• 4-port Fast Ethernet switch
• Auto speed negotiation
WAN
• Dual 10/100M Ethernet ports
• Auto MDI/MDIX
2.3 Software Features
2.3.1 NAT Features
RX3042H provides NAT to share a single high-speed Internet
connection and to save the cost of multiple connections required
for the hosts on the LAN segments connected to it. This feature
conceals network address and prevents them from becoming
public. It maps unregistered IP address of hosts connected to the
LAN with valid ones for Internet access. RX3042H also provides
reverse NAT capability, which enables users to host various
services such as e-mail servers, web servers, etc. The NAT rules
drive the translation mechanism. The following types of NAT are
supported by RX3042H.
• NAPT (Network Address and Port Translation)– Also called IP
Masqueradi ng or ENAT (Enhanced NAT). Maps many internal
hosts to only one globally valid IP address. The mapping usually

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contains a pool of network ports to be used for translation.
Every packet is translated with the globally valid IP address;
the port number is translated with a free pool from the pool of
network ports.
• Reverse NAPT – Also called inbound mapping, port mapping,or
virtual server. Any packet coming to the router can be relayed
to an internal host based on the protocol, port number and/or
IP Address specified in the rule. This is useful when multiple
services are hosted on different internal hosts.
2.3.2 Firewall Features
The firewall as implemented in RX3042H provides the following
features to protect your network from being attacked and to prevent
your network from being used as the springboard for attacks.
• Stateful Packet Inspection
• Packet Filtering (ACL)
• Defense against Denial of Service Attacks
• Log
2.3.2.1 Stateful Packet Inspection
The RX3042H Firewall uses “stateful packet inspection” that
extracts state-related information required for the security decision
from the packet and maintains this information for evaluating
subsequent connection attempts. It has awareness of application
and creates dynamic sessions that allow dynamic connections so
that no ports need to be opened other than the required ones. This
provides a solution which is highly secure and that offers scalability
and extensibility.
2.3.2.2 Packet Filtering – ACL (Access Control List)
ACL rule is one of the basic building blocks for network security.
Firewall monitors each individual packet, decodes the header
information of inbound and outbound traffic and then either blocks
the packet from passing or allows it to pass based on the contents
of the source address, destination address, source port, destination
port, and protocol defined in the ACL rules.

RX3042H User's Manual Getting to Know RX3042H
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ACL is a very appropriate measure for providing isolation of one
subnet from another. It can be used as the first line of defense in
the network to block inbound packets of specific types from ever
reaching the protected network.
The RX3042H Firewallʼs ACL methodology supports:
• Filtering based on destination and source IP address, port
number and protocol
• Use of the wild card for composing filter rules
• Filter Rule priorities
2.3.2.3 Defense against DoS Attacks
The RX3042H Firewall has an Attack Defense Engine that protects
internal networks from known types of Internet attacks. It provides
automatic protection from Denial of Service (DoS) attacks such
as SYN flooding, IP smurfing, LAND, Ping of Death and all re-
assembly attacks. For example, the RX3042H Firewall provides
protection from “WinNuke”, a widely used program to remotely
crash unprotected Windows systems in the Internet. The RX3042H
Firewall also provides protection from a variety of common Internet
attacks such as IP Spoofing, Ping of Death, Land Attack, and
Reassembly attacks.
The type of attack protections provided by the RX3042H is listed in
Table 2.1.
Table 2.1. DoS Attacks
Type of Attack Name of Attacks
Re-assembly Attacks Bonk, Boink, Teardrop ( New Tear),
Overdrop, Opntear, Syndrop, Jolt, IP
fragmentation overlap.
ICMP Attacks Ping of Death, Smurf, Twinge
Flooders Logging only for ICMP Flooder, UDP
Flooder, SYN Flooder
Port Scans Logging only for TCP SYN Scan,
Attacking packets dropped: TCP
XMAS Scan, TCP Null Scan, TCP
Stealth Scan
Protection with PF Rules Echo-Chargen, Ascend Kill
Miscellaneous Attacks IP Spoofing, LAND, Targa, Winnuke

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2.3.2.4 Application Level Gateway (ALG)
Applications such as FTP open connections dynamically based
on the respective application parameter. To go through the firewall
on the RX3042H, packets pertaining to an application, require a
corresponding allow rule. In the absence of such rules, the packets
will be dropped by the RX3042H Firewall. As it is not feasible to
create policies for numerous applications dynamically (at the same
time without compromising security), intelligence in the form of
Application Level Gateways (ALG), is built to parse packets for
applications and open dynamic associations. The RX3042H NAT
provides a number of ALGs for popular applications such as FTP,
and Netmeeting.
2.3.2.5 Log
Events in the network, that could be attempts to affect its security,
are recorded in the RX3042H system log file. The log maintains a
minimum log details such as, time of packet arrival, description of
action taken by Firewall and reason for action.

RX3042H User's Manual Getting to Know RX3042H
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Table 2.2 Front Panel Label and LEDs
LED Label Color Status
Indication
1 Power Green ON RX3042H is powered on.
OFF RX3042H is powered off.
2 Status Green
3
USB Identifies the USB port.
1-2 Green OFF USB device is not detected.
ON USB device is detected.
4
WAN Identifies the WAN port.
1-2
OFF No link is detected.
Green ON 100Mbps link is detected.
Blinking 100Mbps activity is detected.
Amber ON 10Mbps link is detected.
Blinking 10Mbps activity is detected.
5
LAN Identifies the LAN port.
1-4
OFF No link is detected.
Green ON 100Mbps link is detected.
Blinking 100Mbps activity is detected.
Amber ON 10Mbps link is detected.
Blinking 10Mbps activity is detected.
2.4 Finding Your Way Around
2.4.1 Front Panel
The front panel contains LED indicators that show the status of the unit.
Figure 2.1 Front Panel Label and LEDs
12345

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Table 2.3 Rear Panel Labels and LEDs
Label Indication
6 1--4
LAN Ports: connect to your PC's Ethernet
port, or to the uplink port on your LAN's
hub/switch, using the Ethernet cable.
7Dual WAN or
WAN + DMZ
WAN ports:Connect to your WAN device,
such as ADSL or cable modem.
8 USB USB Ports: connect to USB 1.1 OR 2.0
devices
9 Console
10 RESET
Reset Button:
1. Reboot the device
2. Reset the system configuration to
factory defaults if pressed for more than 5
seconds.
11 POWER Power Input Jack: Connect to the supplied
AC adapter.
2.4.2 Rear Panel
The rear panel contains the ports for the unitʼs data and power
connections.
Figure 2.2 Rear Panel Labels and Connectors
6 7 8 9 10 11