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Page 171 / 249 Scroll up to view Page 166 - 170
Chapter 26 Troubleshooting
NBG6515 User’s Guide
171
•
Check the settings for QoS. If it is disabled, you might consider activating it. If it is enabled, you
might consider raising or lowering the priority for some applications.
I set up URL keyword blocking, but I can still access a website that should be blocked.
Make sure that you select the
Enable URL Keyword Blocking
check box in the Content Filtering
screen. Make sure that the keywords that you type are listed in the
Keyword List
.
If a keyword that is listed in the
Keyword List
is not blocked when it is found in a URL, customize
the keyword blocking using commands. See the Customizing Keyword Blocking URL Checking
section in the Content Filter chapter.
26.4
Resetting the NBG to Its Factory Defaults
If you reset the NBG, you lose all of the changes you have made. The NBG re-loads its default
settings, and the password resets to
1234
. You have to make all of your changes again.
You will lose all of your changes when you push the
RESET
button.
To reset the NBG,
1
Make sure the power LED is on.
2
Press the
RESET
button for longer than 1 second to restart/reboot the NBG.
3
Press the
RESET
button for longer than five seconds to set the NBG back to its factory-default
configurations.
If the NBG restarts automatically, wait for the NBG to finish restarting, and log in to the Web
Configurator. The password is “1234”.
If the NBG does not restart automatically,
di
sconnect and reconnect the NBG’s power. Then, follow
the directions above again.
26.5
Wireless Router/AP Troubleshooting
I cannot access the NBG or ping any computer from the WLAN (wireless AP or router).
1
Make sure the wireless LAN is enabled on the NBG
Page 172 / 249
Chapter 26 Troubleshooting
NBG6515 User’s Guide
172
2
Make sure the wireless adapter on the wireless station is working properly.
3
Make sure the wireless adapter installed on your computer is IEEE 802.11 compatible and supports
the same wireless standard as the NBG.
4
Make sure your computer (with a wireless adapter installed) is within the transmission range of the
NBG.
5
Check that both the NBG and your wireless station are using the same wireless and wireless
security settings.
6
Make sure traffic between the WLAN and the LAN is not blocked by the firewall on the NBG.
7
Make sure you allow the NBG to be remotely accessed through the WLAN interface. Check your
remote management settings.
•
See the chapter on Wireless LAN in the User’s Guide for more information.
I cannot access the Web Configurator after I switched to AP mode.
192.168.1.1 is the default IP in Router mode (the default mode). In AP mode the default IP is
192.168.1.2. So, when you switch from Router mode to AP mode, you need to use the AP mode IP to
log in.
26.6
USB Device Problems
I cannot access or see a USB device that is connected to the NBG.
1
Be sure to install the ZyXEL NetUSB Share Center Utility (for NetUSB functionality) first from the
included disc, or download the latest version from the zyxel.com website.
2
Disconnect the problematic USB device, then reconnect it to the NBG.
3
Ensure that the USB device has power.
4
Check your cable connections.
5
Restart the NBG by disconnecting the power and then reconnecting it.
6
If the USB device requires a special driver, install the driver from the installation disc that came
with the device. After driver installation, reconnect the USB device to the NBG and try to connect to
it again with your computer.
7
If the problem persists, contact your vendor.
Page 173 / 249
Chapter 26 Troubleshooting
NBG6515 User’s Guide
173
What kind of USB devices do the NBG support?
1
It is strongly recommended to use version 2.0 or lower USB storage devices (such as memory
sticks, USB hard drives) and/or USB devices (such as USB printers). Other USB products are not
guaranteed to function properly with the NBG.
Page 174 / 249
NBG6515 User’s Guide
174
A
PPENDIX
A
IP Addresses and Subnetting
This appendix introduces IP addresses and subnet masks.
IP addresses identify individual devices on a network. Every networking device (including
computers, servers, routers, printers, etc.) needs an IP address to communicate across the
network. These networking devices are also known as hosts.
Subnet masks determine the maximum number of possible hosts on a network. You can also use
subnet masks to divide one network into multiple sub-networks.
Introduction to IP Addresses
One part of the IP address is the network number, and the other part is the host ID. In the same
way that houses on a street share a common street name, the hosts on a network share a common
network number. Similarly, as each house has its own house number, each host on the network has
its own unique identifying number - the host ID. Routers use the network number to send packets
to the correct network, while the host ID determines to which host on the network the packets are
delivered.
Structure
An IP address is made up of four parts, written in dotted decimal notation (for example,
192.168.1.1). Each of these four parts is known as an octet. An octet is an eight-digit binary
number (for example 11000000, which is 192 in decimal notation).
Therefore, each octet has a possible range of 00000000 to 11111111 in binary, or 0 to 255 in
decimal.
The following figure shows an example IP address in which the first three octets (192.168.1) are
the network number, and the fourth octet (16) is the host ID.
Page 175 / 249
Appendix A IP Addresses and Subnetting
NBG6515 User’s Guide
175
Figure 130
Network Number and Host ID
How much of the IP address is the network number and how much is the host ID varies according
to the subnet mask.
Subnet Masks
A subnet mask is used to determine which bits are part of the network number, and which bits are
part of the host ID (using a logical AND operation). The term “subnet” is short for “sub-network”.
A subnet mask has 32 bits. If a bit in the subnet mask is a “1” then the corresponding bit in the IP
address is part of the network number. If a bit in the subnet mask is “0” then the corresponding bit
in the IP address is part of the host ID.
The following example shows a subnet mask identifying the network number (in bold text) and host
ID of an IP address (192.168.1.2 in decimal).
By convention, subnet masks always consist of a continuous sequence of ones beginning from the
leftmost bit of the mask, followed by a continuous sequence of zeros, for a total number of 32 bits.
Subnet masks can be referred to by the size of the network number part (the bits with a “1” value).
For example, an “8-bit mask” means that the first 8 bits of the mask are ones and the remaining 24
bits are zeroes.
Table 81
IP Address Network Number and Host ID Example
1ST OCTET:
(192)
2ND
OCTET:
(168)
3RD
OCTET:
(1)
4TH OCTET
(2)
IP Address (Binary)
11000000
10101000
00000001
00000010
Subnet Mask (Binary)
11111111
11111111
11111111
00000000
Network Number
11000000
10101000
00000001
Host ID
00000010

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