Ba1258B_RemoteRig_MkIIs-A33.docx
Microbit 2.0 AB 2010. All rights reserved
Networks and Firewalls
One of the major obstacles when trying to remotely control something is the fact that the
Internet Service Provider (ISP) forces us to use dynamic IP addresses. We can never know,
from time to time, which IP address our modem / firewall / router has on its outside interface
(the IP address you will try to connect to). Most people use NAT routers that translates IP
addresses on the inside (your little LAN) to one common IP address on the outside using port
conversion.
To be able to stream audio and at the same time transfer CAT / CI-V commands or panel-to-
radio communications' we need to know which IP port numbers are used for each service.
There are some different techniques to fix this.
At the operator end (Control-RRC) there is normally OK just to use DHCP for the own IP-
settings. For the Sip contact parameter you enter the public fixed IP address or Dynamic
DNS-name to the router at the radio site.
At the radio end (Radio-RRC) the router must be configured so that port 13000, 13001,
13002 and 80 (default settings) are directed to the Radio-RRC which should have a static IP
address. The easy way to get connected is to set the RRC IP address as DMZ server in the
router. This makes it possible to connect to all services (SIP, audio and control) as well as the
web and telnet interfaces without further configuration. If you run a web server at the radio
site you need to change the webserver port from 80 to something else, for example 8000.
Port 80 can also be blocked by the ISP. If you are using port forwarding you have to configure
the router in a way that every service forwards packets to the right host on the inside.
When setting up the router check that there is No SIP ALG activated.
You will also need to register the Radio-RRC to a Dynamic DNS Service so you can use a host
name to connect to the Radio-RRC regardless of its dynamic IP address (which can change
without notice, but rarely does).
The following default IP ports are used (changeable)
SIP (change this port number in both ends if you are using SIP based
IP-telephony)
DATA channel, control commands
In earlier firmwares, other default ports where used (eg 12000,11000,5060,80,23)
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