RabbitCore RCM2000 Series, Getting Started Manual

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Getting Started 25
The following IP addresses are set aside for local networks and are not allowed on the
Internet: 10.0.0.0 to 10.255.255.255, 172.16.0.0 to 172.31.255.255, and 192.168.0.0 to
192.168.255.255.
The RCM2200 board uses a 10Base-T type of Ethernet connection, which is the most
common scheme. The RJ-45 connectors are similar to U.S. style telephone connectors, are
except larger and have 8 contacts.
An alternative to the direct connection using a crossover cable is a direct connection using
a hub. The hub relays packets received on any port to all of the ports on the hub. Hubs are
low in cost and are readily available. The RCM2200 board uses 10 Mbps Ethernet, so the
hub or Ethernet adapter must be either a 10 Mbps unit or a 10/100 unit that adapts to either
10 or 100 Mbps.
In a corporate setting where the Internet is brought in via a high-speed line, there are typi-
cally machines between the outside Internet and the internal network. These machines
include a combination of proxy servers and firewalls that filter and multiplex Internet traf-
fic. In the configuration below, the RCM2200 board could be given a fixed address so any
of the computers on the local network would be able to contact it. It may be possible to
configure the firewall or proxy server to allow hosts on the Internet to directly contact the
controller, but it would probably be easier to place the controller directly on the external
network outside of the firewall. This avoids some of the configuration complications by
sacrificing some security.
If your system administrator can give you an Ethernet cable along with its IP address, the
netmask and the gateway address, then you may be able to run the sample programs with-
out having to setup a direct connection between your computer and the RCM2200 board.
You will also need the IP address of the nameserver, the name or IP address of your mail
server, and your domain name for some of the sample programs.
Hub(s)
Firewall
Proxy
Server
T1 in
Adapter
Ethernet
Ethernet
Network
RCM2200
Board
Typical Corporate Network