Titan Electronics Inc NETCOM423 Benutzerhandbuch

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NetCom 123 WLAN, 423 WLAN                                                              Page 
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NetCom 123 WLAN, 423 WLAN, 
 
or 104 bit keys, sometimes also named WEP40/WEP64 or 
WEP104/WEP128. Which of this is required is defined by the 
“Encryption Key” Parameter. The key may be entered as ASCII 
characters, or as hexadecimal for a binary key. A string with 5 
characters is WEP40 using an ASCII key. Using 10 characters as key 
defines this key as also WEP40, but with a binary key in hexadecimal 
notation. Likewise a 13 character string is WEP104 with ASCII, and 26 
characters select WEP104 with a binary key. 
 
WPA Encryption is available for the TKIP protocol. The key is PSK 
(Pre-Shared 
Key) and must be installed on all stations. It is 
recommended to use WPA-PSK/TKIP with a binary key, generated 
from random data. 
“RTSThreshold” and “Fragmentation Threshold” are low level WLAN 
parameters. They should match the configuration in the Access Point. 
Higher values result in better data throughput. But when transmission 
error occur, the impact is dramatic. In this case lower values provide 
better security and better performance. 
5.1.1.4. Encrypted 
Communication 
Firmware version 2.2  introduces  a  way for encrypted communication 
with the NetCom Serial Device Server. This function establishes an 
encrypted VPN tunnel between your computer and the NetCom. All 
communication to the NetCom uses this new connection. No 
application requires a change of operation, but seamlessly gets the 
advantages of Encryption. 
To build this tunnel NetCom uses the Open 
Source product 
OpenVPN™ (
). This is the configuration of the 
parameters on the NetCom side. The function and the configuration of 
OpenVPN™ is described with more details later in the section of 
OpenVPN™ Client installation.