Titan Electronics Inc NETCOM423 Manuel D’Utilisation
Page
49
NetCom 123 WLAN, 423 WLAN,
5.2.6. M
ANUAL
D
ETECTION
/I
NSTALLATION OF A
N
ET
C
OM
Sometimes the NetCom Device Server can not be detected by the
automatic in the NetCom Manager. To detect and configure devices the
protocol SNMP is used. The detection is done by sending out a
broadcast on all available network interfaces of your computer. This
SNMP broadcast is realized as an Ethernet broadcast. Such a broadcast
is only transmitted through Hubs and Switches. When there is a router
between the computer and the NetCom, the broadcast is not transmitted.
This is especially the case when the NetCom is located somewhere via
Internet, but also in big networks of some companies. If this is the case,
the detection has to be done manually. Refer to Image 51 and “Add” the
NetCom by use of the button. Enter the IP-Address of the NetCom in
the NetCom Manager Server Settings, and click the button “Verify”.
Since now the IP-Address of the NetCom is known, the
NetCom Manager sends a request directly to this target. This directed
SNMP request is transported, even by routers. The NetCom sends the
normal reply, giving all required information to the NetCom Manager.
Now it is possible to configure all options as usual. Also the drivers for
virtual serial ports are installable now.
Please note, the drivers require to have the IP Address. They can not
operate using a DNS name, because a driver can not perform a DNS
name resolution. If your NetCom is located on a dynamic IP Address
(e.g. on a DialUp connection with 24 hours disconnection), you need to
reconfigure the driver installation, when the IP Address has changed.
automatic in the NetCom Manager. To detect and configure devices the
protocol SNMP is used. The detection is done by sending out a
broadcast on all available network interfaces of your computer. This
SNMP broadcast is realized as an Ethernet broadcast. Such a broadcast
is only transmitted through Hubs and Switches. When there is a router
between the computer and the NetCom, the broadcast is not transmitted.
This is especially the case when the NetCom is located somewhere via
Internet, but also in big networks of some companies. If this is the case,
the detection has to be done manually. Refer to Image 51 and “Add” the
NetCom by use of the button. Enter the IP-Address of the NetCom in
the NetCom Manager Server Settings, and click the button “Verify”.
Since now the IP-Address of the NetCom is known, the
NetCom Manager sends a request directly to this target. This directed
SNMP request is transported, even by routers. The NetCom sends the
normal reply, giving all required information to the NetCom Manager.
Now it is possible to configure all options as usual. Also the drivers for
virtual serial ports are installable now.
Please note, the drivers require to have the IP Address. They can not
operate using a DNS name, because a driver can not perform a DNS
name resolution. If your NetCom is located on a dynamic IP Address
(e.g. on a DialUp connection with 24 hours disconnection), you need to
reconfigure the driver installation, when the IP Address has changed.
5.2.7. F
IREWALL
T
RAVERSAL
C
ONFIGURATION
There are more difficult situations with a Firewall between the NetCom
and the NetCom Manager. Many Firewalls protect the internal LAN by
using the feature of NAT (Network Address Translation). In this
situation the IP-Address of the internal device is not visible on the
Internet. Only the Firewall can be contacted via its public IP-Address.
The NetCom Manager and the driver software for the virtual serial ports
can handle such setups. But this requires certain configurations.
5.2.7.1.
and the NetCom Manager. Many Firewalls protect the internal LAN by
using the feature of NAT (Network Address Translation). In this
situation the IP-Address of the internal device is not visible on the
Internet. Only the Firewall can be contacted via its public IP-Address.
The NetCom Manager and the driver software for the virtual serial ports
can handle such setups. But this requires certain configurations.
5.2.7.1.
SOHO Firewall example
The most easy situation for such a setup is by using a very simple
SOHO router as the Firewall. This configuration will show the principle
of the technical details. Those principles can be transferred very easy to
the configuration of more complicated installations. On the SOHO
SOHO router as the Firewall. This configuration will show the principle
of the technical details. Those principles can be transferred very easy to
the configuration of more complicated installations. On the SOHO