Titan Electronics Inc NETCOM423 Manuel D’Utilisation
823RM WLAN, 1623RM WLAN
Page
50
router there is only one public IP-Address on the external side, and
typically 254 internal IP-Addresses for the LAN side. These internal
addresses may be assigned by DHCP or static. Such routers offer a
feature typically named “DMZ”, which in fact is only a single exposed
host. It is recommended not to use the “DMZ” for several reasons, some
of them are security related.
5.2.7.2.
typically 254 internal IP-Addresses for the LAN side. These internal
addresses may be assigned by DHCP or static. Such routers offer a
feature typically named “DMZ”, which in fact is only a single exposed
host. It is recommended not to use the “DMZ” for several reasons, some
of them are security related.
5.2.7.2.
SOHO Virtual Servers
The router also offers “Virtual Servers”, which is the option required
for NetCom installation. These “Virtual Servers” (here named VSrv for
short) operate by a technique called PAT (Port Address Translation).
Certain data addressed to the public IP-Address of the router are
forwarded to the internal private address of the NetCom. The NetCom
can be contacted via the public IP-Address of the router.
First you need to configure the router for some VSrvs. As the absolute
minimum there is one VSrv for the NetCom device itself, and another
two VSrvs for each serial port of the NetCom. Those VSrv are to be
configured for TCP or UDP transmissions. Please read in the manual of
your router how to do that. You need a port for the external interface,
and an IP-Address plus a port for the LAN side. The IP-Address is of
course that of the NetCom. As an example the most easy device is a
NetCom 113. The internal port for SNMP is 161 for UDP. The serial
port requires ports 2000 and 2001 for TCP.
for NetCom installation. These “Virtual Servers” (here named VSrv for
short) operate by a technique called PAT (Port Address Translation).
Certain data addressed to the public IP-Address of the router are
forwarded to the internal private address of the NetCom. The NetCom
can be contacted via the public IP-Address of the router.
First you need to configure the router for some VSrvs. As the absolute
minimum there is one VSrv for the NetCom device itself, and another
two VSrvs for each serial port of the NetCom. Those VSrv are to be
configured for TCP or UDP transmissions. Please read in the manual of
your router how to do that. You need a port for the external interface,
and an IP-Address plus a port for the LAN side. The IP-Address is of
course that of the NetCom. As an example the most easy device is a
NetCom 113. The internal port for SNMP is 161 for UDP. The serial
port requires ports 2000 and 2001 for TCP.
Function External port Internal port
SNMP 8161/UDP 161/UDP
Control 9000/TCP 2000/TCP
Data 9001/TCP 2001/TCP
SNMP 8161/UDP 161/UDP
Control 9000/TCP 2000/TCP
Data 9001/TCP 2001/TCP
Configure your router for these example VSrvs, and use the internal
IP-Address of the NetCom for the targets. Connect the NetCom to your
LAN. Now you are ready for a very first test. Use Telnet to connect to
the Data port of the NetCom serial port. Open a console (DOS Box) and
type the command
IP-Address of the NetCom for the targets. Connect the NetCom to your
LAN. Now you are ready for a very first test. Use Telnet to connect to
the Data port of the NetCom serial port. Open a console (DOS Box) and
type the command
Telnet <routers-IP-Address> 9001
You will be connected to the serial port. Every character you type is
sent out of the serial port, and every received data is shown on your
screen. The serial parameters are preconfigured in your NetCom.
sent out of the serial port, and every received data is shown on your
screen. The serial parameters are preconfigured in your NetCom.