13.6.14  
Internet Access 
 
One or more client PCs can directly access the Internet using a Web browser. The connection from the LAN is set up via ISDN or DSL. In general, access is possible from all PCs. (Please note that this is not allowed for all tariffs of every provider.)
Internet access takes place via the HG 1500 to the Internet provider, using the IP transport protocol.
All clients use the same provider.

Features  
 •   Static or dynamic IP addresses
 •   Routing function with NAT/SUA (Network Address Translation/Single User Access)
 •   PPP multilink (channel bundling)
 •   PPPoE (for DSL)
 •   PPTP (for DSL)
 •   PAP (Password Authentication Protocol)
 •   CHAP (Challenge Handshake Authentication Protocol)

13.6.14.1  
HG 1500 and Access to the Internet via a Network Provider 

 Figure 13-6   Internet Access via a Network Provider
 

13.6.14.2  
Internet Access via T-DSL (T-ISDN DSL) 
At the end of 1999, Deutsche Telekom AG launched a new product (T-ISDN DSL, also known as T-DSL) which combines fast Internet access with enhanced T-ISDN telephony features. (Other providers, for example, in the Netherlands, use DSL with the PPTP protocol).
T-ISDN DSL is first and foremost a normal T-Net or ISDN connection as a multi-device or system connection.
Over and above the functions of the normal T-Net or ISDN connection, the T-DSL connection has a data interface for Internet connections with a speed of 768 Kbps downstream and 128 Kbps upstream. The use of this data interface does not seize any T-Net or ISDN channels.

Function  
In contrast to T-ISDN, the NTBA is not connected directly to the main station but rather downstream of a splitter (BBAE). This device can be seen as a DSL-speed distributor between the ISDN connection and data transmission.
The splitter has a TAE jack to which the NTBA is connected. The connection to the HiPath 3000 is set up in the conventional manner.
In addition, the splitter features a connection for the T-DSL modem (NTBBA) which provides the interface for data transmission at T-DSL speed.
The T-DSL modem is connected to the board via a 10BaseT interface. The PPPoE (Point to Point Protocol over Ethernet) protocol is used for the connection.

 Figure 13-7   Internet Access via T-DSL
 

13.6.14.3  
IP Address Mapping 
With the expansion of the Internet, it has become common practice to use the short but globally unique IP addresses exclusively for the Internet and to revert to private (not public) IP addresses for IP networks within companies.
Consequently, addresses from the same IP network can frequently be used in many companies.
The "IP address mapping" feature was developed to enable users to reach these addresses via a unique routing entry despite the multiplicity of entries.
When routing to specific partners defined during configuration, HG 1500 exchanges the private IP addresses used in its own LAN for other IP addresses and can in return be contacted by external users via these IP addresses.

HiPath 3000/5000 V9, Service Documentation, Issue 7   up Top
Disclaimer & Copyright   ID: P31003H3590S100017620   2012-06-25