CHAPTER 8
Advanced Use of 2250 Light – Tips and Tricks
69
Compact Flash Modems
The following modem has been tested:
•
Compact GPRS from Pretec (www.pretec.com)
Compact flash modems can be inserted directly in the compact flash socket of the analyzer.
8.2.3
DynDNS
If the analyzer is connected to:
•
the Internet through a GPRS/EDGE/HSPA modem, or
•
a local network with access to the Internet through a DSL modem/router
and you want to connect to the instrument from a place outside the local network, then you
need to know:
•
global IP address of the instrument or
•
the global IP address of the DSL modem/router (and ensure that correct port forwarding in
has been set the router – see details in the on-line help for BZ-5503)
In some cases the global IP address is static and will never change, so you connect to the
instrument using BZ-5503 or an Internet browser by using this IP address.
Normally when you browse to addresses using an Internet Browser you do not use the IP
address itself, but a hostname for it (e.g. you would use the hostname www.google.com instead
of ‘74.125.77.99’). This requires a DNS (Domain Name System) provider, which is a kind of
Internet phone book that translates hostnames to IP addresses for you.
However, for a GPRS/EDGE/HSPA or even a DSL router then often the global IP address is
renewed at each new connection or at certain time-intervals (e.g., every two weeks). In this
case you will have to change the IP address in BZ-5503 or the Internet Browser accordingly. To
avoid this, a service like DDNS (Dynamic Domain Name System) can be used.
DDNS is a network service that provides the capability for a modem/router/computer system to
notify a domain name system provider to change, in real time (ad-hoc), the active DNS
configuration of its configured hostnames and IP addresses. This will ensure that the hostname
you use will always be updated to reflect the correct IP-address.
The analyzer supports DDNS provided by the world-wide DDNS service provider
‘DynDNS.com’.
The analyzer can then be configured to notify DynDNS.com each time the global IP address is
set or changed. When BZ-5503 or an Internet Browser connects to the analyzer it then uses a
hostname defined by DynDNS.com. From DynDNS.com it then gets the updated IP address.
You need to make an account at DynDNS.com, specifying a user name and a password for the
account and a hostname (e.g., 'MyBK2250.dyndns.org') identifying the analyzer.
In the analyzer you need to specify the Hostname, Username and Password and set
Active
to
Yes
in
Preferences
, under
Modem/DynDNS
settings. Each time the analyzer detects a change in
the IP address it notifies DynDNS.com.
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