Titan Electronics Inc NETCOM423 Benutzerhandbuch
Page
53
NetCom 123 WLAN, 423 WLAN,
9001 and 9000 in this example. Please note, so far there is no number
for the Virtual Com Port available. The driver is not installed in this
moment, and Windows does not know about the available hardware.
This will happen later in the installation. Click the “OK” button, and
proceed with the driver installation as already described.
5.2.7.5.
for the Virtual Com Port available. The driver is not installed in this
moment, and Windows does not know about the available hardware.
This will happen later in the installation. Click the “OK” button, and
proceed with the driver installation as already described.
5.2.7.5.
DMZ and Virtual Servers
Why is it recommended not to use the DMZ function of the router?
There are two reasons. The first one is simple, only one device in the
LAN can be defined as the DMZ target. The DMZ is implemented as
“Send all IP data targeted for the router to the DMZ station, as long as
there is no specific rule for a different target”. When a second NetCom
shall be installed on the LAN, the Virtual Servers have to be configured
anyway. The second reason is the security. Using the DMZ the Firewall
in the router becomes transparent. All data from outside is transferred to
the LAN, including all malicious data.
There are two reasons. The first one is simple, only one device in the
LAN can be defined as the DMZ target. The DMZ is implemented as
“Send all IP data targeted for the router to the DMZ station, as long as
there is no specific rule for a different target”. When a second NetCom
shall be installed on the LAN, the Virtual Servers have to be configured
anyway. The second reason is the security. Using the DMZ the Firewall
in the router becomes transparent. All data from outside is transferred to
the LAN, including all malicious data.
5.2.8. D
YNAMIC
IP A
DDRESS AND
O
PEN
VPN™
Since Firmware version 2.2 there is a different method to provide a
tunnel to the NetCom. The option of Encryption uses a Virtual Private
Network (VPN) based on a single TCP connection between the NetCom
and a client computer. Regardless of strong encryption or even weak as
not encrypted, here the key point is the single TCP connection. It is
more simple to provide a Firewall configuration for a single connection,
so the Router Firewall is more easy to set up.
The network link established by OpenVPN™ requires to have a target
address and a port number. Since the basic TCP connection is activated
by the openvpn.exe program, there is the freedom of using a DNS name
for the target device.
With a Dynamic IP Address for the NetCom site, one of the several
Internet services for Dynamic DNS (DDNS) may help. It is even
relatively simple to construct an own version. Using this service the
openvpn.exe program gets the IP Address of the Firewall Router, and
will establish the link. When the IP Address changes (after 24 hours),
the connection first gets lost. OpenVPN™ will continuously attempt to
connect again. When the new IP Address is known via DDNS, the
network link is re-established. The NetCom is available again. Even
when a serial port has been open, the function will continue seamlessly.
tunnel to the NetCom. The option of Encryption uses a Virtual Private
Network (VPN) based on a single TCP connection between the NetCom
and a client computer. Regardless of strong encryption or even weak as
not encrypted, here the key point is the single TCP connection. It is
more simple to provide a Firewall configuration for a single connection,
so the Router Firewall is more easy to set up.
The network link established by OpenVPN™ requires to have a target
address and a port number. Since the basic TCP connection is activated
by the openvpn.exe program, there is the freedom of using a DNS name
for the target device.
With a Dynamic IP Address for the NetCom site, one of the several
Internet services for Dynamic DNS (DDNS) may help. It is even
relatively simple to construct an own version. Using this service the
openvpn.exe program gets the IP Address of the Firewall Router, and
will establish the link. When the IP Address changes (after 24 hours),
the connection first gets lost. OpenVPN™ will continuously attempt to
connect again. When the new IP Address is known via DDNS, the
network link is re-established. The NetCom is available again. Even
when a serial port has been open, the function will continue seamlessly.