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Page 211 / 268 Scroll up to view Page 206 - 210
Appendix A IP Addresses and Subnetting
NBG4604 User’s Guide
211
The following table is a summary for subnet planning on a network with a 16-bit
network number.
Configuring IP Addresses
Where you obtain your network number depends on your particular situation. If
the ISP or your network administrator assigns you a block of registered IP
addresses, follow their instructions in selecting the IP addresses and the subnet
mask.
If the ISP did not explicitly give you an IP network number, then most likely you
have a single user account and the ISP will assign you a dynamic IP address when
the connection is established. If this is the case, it is recommended that you select
a network number from 192.168.0.0 to 192.168.255.0. The Internet Assigned
Number Authority (IANA) reserved this block of addresses specifically for private
use; please do not use any other number unless you are told otherwise. You must
also enable Network Address Translation (NAT) on the NBG4604.
Once you have decided on the network number, pick an IP address for your
NBG4604 that is easy to remember (for instance, 192.168.1.1) but make sure
that no other device on your network is using that IP address.
The subnet mask specifies the network number portion of an IP address. Your
NBG4604 will compute the subnet mask automatically based on the IP address
Table 85
16-bit Network Number Subnet Planning
NO. “BORROWED”
HOST BITS
SUBNET MASK
NO. SUBNETS
NO. HOSTS PER
SUBNET
1
255.255.128.0 (/17)
2
32766
2
255.255.192.0 (/18)
4
16382
3
255.255.224.0 (/19)
8
8190
4
255.255.240.0 (/20)
16
4094
5
255.255.248.0 (/21)
32
2046
6
255.255.252.0 (/22)
64
1022
7
255.255.254.0 (/23)
128
510
8
255.255.255.0 (/24)
256
254
9
255.255.255.128 (/25)
512
126
10
255.255.255.192 (/26)
1024
62
11
255.255.255.224 (/27)
2048
30
12
255.255.255.240 (/28)
4096
14
13
255.255.255.248 (/29)
8192
6
14
255.255.255.252 (/30)
16384
2
15
255.255.255.254 (/31)
32768
1
Page 212 / 268
Appendix A IP Addresses and Subnetting
NBG4604 User’s Guide
212
that you entered. You don't need to change the subnet mask computed by the
NBG4604 unless you are instructed to do otherwise.
Private IP Addresses
Every machine on the Internet must have a unique address. If your networks are
isolated from the Internet (running only between two branch offices, for example)
you can assign any IP addresses to the hosts without problems. However, the
Internet Assigned Numbers Authority (IANA) has reserved the following three
blocks of IP addresses specifically for private networks:
• 10.0.0.0
— 10.255.255.255
• 172.16.0.0
— 172.31.255.255
•
192.168.0.0 — 192.168.255.255
You can obtain your IP address from the IANA, from an ISP, or it can be assigned
from a private network. If you belong to a small organization and your Internet
access is through an ISP, the ISP can provide you with the Internet addresses for
your local networks. On the other hand, if you are part of a much larger
organization, you should consult your network administrator for the appropriate IP
addresses.
Regardless of your particular situation, do not create an arbitrary IP address;
always follow the guidelines above. For more information on address assignment,
please refer to RFC 1597,
Address Allocation for Private Internets
and RFC 1466,
Guidelines for Management of IP Address Space.
Page 213 / 268
NBG4604 User’s Guide
213
A
PPENDIX
B
Pop-up Windows, JavaScript
and Java Permissions
In order to use the Web Configurator you need to allow:
•
Web browser pop-up windows from your device.
•
JavaScript (enabled by default).
•
Java permissions (enabled by default).
Note: Internet Explorer 6 screens are used here. Screens for other Internet Explorer
versions may vary.
Internet Explorer Pop-up Blockers
You may have to disable pop-up blocking to log into your device.
Either disable pop-up blocking (enabled by default in Windows XP SP (Service
Pack) 2) or allow pop-up blocking and create an exception for your device’s IP
address.
Disable pop-up Blockers
1
In Internet Explorer, select
Tools
,
Pop-up Blocker
and then select
Turn Off
Pop-up Blocker
.
Figure 130
Pop-up Blocker
You can also check if pop-up blocking is disabled in the
Pop-up Blocker
section in
the
Privacy
tab.
Page 214 / 268
Appendix B Pop-up Windows, JavaScript and Java Permissions
NBG4604 User’s Guide
214
1
In Internet Explorer, select
Tools
,
Internet Options
,
Privacy
.
2
Clear the
Block pop-ups
check box in the
Pop-up Blocker
section of the screen.
This disables any web pop-up blockers you may have enabled.
Figure 131
Internet Options: Privacy
3
Click
Apply
to save this setting.
Enable pop-up Blockers with Exceptions
Alternatively, if you only want to allow pop-up windows from your device, see the
following steps.
1
In Internet Explorer, select
Tools
,
Internet Options
and then the
Privacy
tab.
Page 215 / 268
Appendix B Pop-up Windows, JavaScript and Java Permissions
NBG4604 User’s Guide
215
2
Select
Settings…
to open the
Pop-up Blocker Settings
screen.
Figure 132
Internet Options: Privacy
3
Type the IP address of your device (the web page that you do not want to have
blocked) with the prefix “http://”. For example, http://192.168.167.1.

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