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High Speed Services AXIS 2100 User’s Guide
52
Appendix D - High Speed Services
You will experience the full performance of the AXIS 2100 if you have access to high speed
Internet services; such as, xDSL or a cable modem connection. However, as most high speed
Internet services only provide you with one external IP address, there are several practical issues
that should be considered when developing your application.
Available IP Addresses
Ideally, your ISP (Internet Service Provider) will provide you with several external static IP
addresses - in which case you can assign any one of these to your AXIS 2100 to make it fully
accessible over the internet. However, if your service provider supplies you with only one IP
number - which is often the case - this IP number is normally assigned to your PC - leaving no
connection available for your AXIS 2100. So, what can you do if
your ISP is unable to provide you
with an additional IP number? Fortunately, there are a number of other options that you may like
to consider; including:
NAT Box
Short for Network Address Translation, NAT is an Internet standard that allows a local-area
network (LAN) to use one set of IP addresses for internal traffic and a second set of addresses for
external traffic. A NAT box located where your LAN meets the Internet will handle all of the
necessary IP address translations and provides:
• Internal IP addresses that are unique to your network - with no possibility of conflict with IP
addresses used by other companies and organizations.
• The possibility of combining multiple ISDN connections into a single Internet connection.
• An effective firewall for hiding internal IP addresses
NAT Feature in Windows 2000
Utilize the NAT feature in Windows 2000 to allow multiple Ethernet cards in your PC, and you
can then use one port for the internet and the other for your internal network. With this solution,
you can let your AXIS 2100 upload image streams to an external Web server that is maintained and
located with your ISP.
Note: For further details on Network Address Translation, see also RFC 1631.
Routers and Firewalls
Another ideal solution is to use one of several small routers/firewalls currently available on the
market. This provide the necessary NAT functionality and allow complete independence for your
PC, which can be switched off or rebooted without effecting the image transmission from your
AXIS 2100.