ZyXEL G-470 User Guide - Page 77

G-470 User’s Guide

Chapter 8 Troubleshooting

77

8.5

Problems with the Ethernet Interface

Table 22

Troubleshooting the Ethernet Interface

PROBLEM

CORRECTIVE ACTION

I cannot access the

ZyXEL Device from

the LAN.

If the

ETHN

LED on the front panel is off, check the Ethernet cable connection

between your ZyXEL Device and the Ethernet device connected to the

ETHERNET

port.

Check for faulty Ethernet cables.

Make sure your computer’s Ethernet adapter is installed and working properly.

Check the IP address of the Ethernet device. Verify that the IP address and the

subnet mask of the ZyXEL Device, the Ethernet device and your computer are

on the same subnet.

I cannot ping any

computer on the

LAN.

If the

ETHN

LED on the front panel is off, check the Ethernet cable connections

between your ZyXEL Device and the Ethernet device.

Check the Ethernet cable connections between the Ethernet device and the

LAN computers.

Check for faulty Ethernet cables.

Make sure the LAN computer’s Ethernet adapter is installed and working

properly.

Verify that the IP address and the subnet mask of the ZyXEL Device, the

Ethernet device and the LAN computers are on the same subnet.

I cannot access the

web configurator.

Your computer’s and the ZyXEL Device’s IP addresses must be on the same

subnet for LAN access.

If you changed the ZyXEL Device’s IP address, then enter the new one as the

URL.

If you don’t know the ZyXEL Device’s IP address, type the device name of your

ZyXEL Device as the URL. ZyXELXXXX is the default where “XXXX” is the last

four digits of the MAC address. The MAC address is on the bottom of the

device).

If you just changed the ZyXEL Device’s IP address, your computer’s cache of

machine names may contain an entry that maps the name of the ZyXEL Device

to its previous IP address.

In Windows, use

nbtstat -R

at the command prompt to delete all entries in your

computer’s cache of machine names.

Open a new browser window.

See the following section to check that pop-up windows, JavaScripts and Java

permissions are allowed.

You may also need to clear your Internet browser’s cache.

In Internet Explorer, click

Tools

and then

Internet Options

to open the

Internet

Option

s screen.

In the

General

tab, click

Delete Files

. In the pop-up window, select the

Delete

all offline content

check box and click

OK

. Click

OK

in the

Internet Options

screen to close it.

If you disconnect your computer from one device and connect it to another

device that has the same IP address, your computer’s ARP (Address Resolution

Protocol) table may contain an entry that maps the management IP address to

the previous device’s MAC address).

In Windows, use

arp -d

at the command prompt to delete all entries in your

computer’s ARP table.

Open a new browser window.

Section	Page
User’s Guide	1
Copyright	3
Certifications	4
ZyXEL Limited Warranty	6
Safety Warnings	7
Customer Support	8
Table of Contents	11
List of Figures	15
List of Tables	17
Preface	19
Getting Started	21
1.1 About Your ZyXEL Device	21
1.1.1 ZyXEL Device Hardware Installation	22
1.1.2 Application Overview	23
Tutorial	27
2.1 Connecting to an Access Point	27
2.1.1 Before You Start	27
2.1.2 The Web Configurator	27
Wireless LAN Network	31
3.1 Wireless LAN Overview	31
3.2 Wireless LAN Security	32
3.2.1 User Authentication and Encryption	32
Introducing the Web Configurator	35
4.1 Web Configurator Overview	35
4.1.1 Setting Up Your Computer's IP Address	35
4.2 Accessing the Web Configurator	39
4.2.1 The Status Screen	39
4.3 Navigating the Web Configurator	41
4.3.1 Change Your Password	41
4.3.2 Statistics	42
4.4 Configuring the ZyXEL Device Using the Wizard	43
4.4.1 Wizard: Basic Settings	43
4.4.2 Wizard: Wireless Settings	44
4.4.3 Wizard: Security Settings	45
4.4.4 Wizard: Confirm Your Settings	48
4.5 Using the AP Survey tool	49
4.6 Resetting the ZyXEL Device	49
4.6.1 Restoring Factory Defaults	49
System Screen	51
5.1 TCP/IP Parameters	51
5.1.1 IP Address Assignment	51
5.1.2 IP Address and Subnet Mask	51
5.2 System Settings	52
Wireless Screens	55
6.1 Wireless LAN Overview	55
6.1.1 BSS (Infrastructure)	55
6.1.2 ESS	56
6.2 Wireless LAN Basics	56
6.2.1 Channel	56
6.2.2 SSID	57
6.2.3 RTS/CTS	57
6.2.4 Fragmentation Threshold	58
6.3 Configuring Wireless	58
6.3.1 The AP Survey Window	60
6.4 Wireless Security Overview	61
6.5 Configuring Wireless Security	61
6.5.1 Wireless Security: Disable	62
6.5.2 Wireless Security: WEP	62
6.5.3 Wireless Security: WPA(2)-PSK	64
6.5.4 Wireless Security: WPA(2)	64
6.5.5 Wireless Security: IEEE 802.1x	66
Management Screens	69
7.1 Management Overview	69
7.2 Password	69
7.3 Configuration File	70
7.3.1 Backup Configuration	71
7.3.2 Restore Configuration	71
7.3.3 Back to Factory Defaults	71
7.4 F/W Upload Screen	72
Troubleshooting	75
8.1 Problems Starting Up the ZyXEL Device	75
8.2 Problems with the Password	75
8.3 Problem with the Wireless Link Quality	76
8.4 Problems Communicating With Other Computers	76
8.5 Problems with the Ethernet Interface	77
8.5.1 Pop-up Windows, JavaScripts and Java Permissions	78
8.6 Testing the Connection to the ZyXEL Device	85
Product Specifications	87
Wireless Security	89
Types of EAP Authentication	89
EAP-MD5 (Message-Digest Algorithm 5)	89
EAP-TLS (Transport Layer Security)	89
EAP-TTLS (Tunneled Transport Layer Service)	90
PEAP (Protected EAP)	90
LEAP	90
Dynamic WEP Key Exchange	90
WPA(2)	91
Encryption	91
User Authentication	92
WPA(2)-PSK Application Example	92
WPA(2) with RADIUS Application Example	93
Security Parameters Summary	94
Setting up Your Computer’s IP Address	95
Windows 95/98/Me	95
Installing Components	96
Configuring	97
Verifying Settings	98
Windows 2000/NT/XP	98
Verifying Settings	102
Macintosh OS 8/9	102
Verifying Settings	104
Macintosh OS X	104
Verifying Settings	105
Index	107
A	107
B	107
C	107
D	107
E	107
F	107
G	108
H	108
I	108
J	108
L	108
M	108
N	108
O	108
P	108
Q	109
R	109
S	109
T	109
U	109
V	109
W	110

ZyXEL G-470 User Guide - Page 77

Problems with the Ethernet Interface

Page 77 highlights