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1740 SHDSL 2/4-Wire Router User’s Guide 
3.4.3 
PPPoE 
When a VC is configured for PPPoE, the router will auto-detect the Authentication code (PAP or CHAP). 
The NAPT and DHCP server functions will be enabled automatically. 
STEP 1: Click WAN Setup on the Basic menu bar and enter the following parameters to set up PPPoE. 
VPI 
Enter a value for the vitual path identifier 
VCI  
Enter a value for the virtual channel identifier 
LLC Encapsulation: 
With LLC encapsulation, a link control header is added to the 
Ethernet packet that identifies the protocol type (Ethernet). This 
allows multiple protocols to be transmitted over the ATM Virtual 
Circuit. 
VC Multiplexing: 
With VC Multiplexing, no link control header is needed as the ATM 
Virtual Circuit is assumed to be carrying a single protocol. 
Enable NAPT 
Selecting Enabling NAPT will enable Network Port Address 
Translation on the WAN interface.  
User Name/Password  These two fields are used for remote subscriber to log on for 
Internet access. 
Mode 
Direct and Auto. If the mode is set to Auto, the PPPoE negotiation 
automatically starts when the system identifies any traffic required 
to be transferred on the link. When DIRECT is selected the PPPoE 
negotiation is started manually.  
Idle Timeout 
The Idle Time field defines the period of idle time after which the 
PPPoE link will be terminated. It is functional in the auto mode. 
The default setting is 5 minutes. In Direct mode, this function is not 
used and the field displays zero.  
Enable DHCP server 
Check the item to enable the DHCP server or uncheck it to disable 
it. 
Keepalive 
Interval(sec): 
Keep-alive is a networking operation that periodically (default- 
every 10 seconds) checks the availability of a PPPoE/PPPoA 
connection between the CO and CPE. If the keep-alive message is 
not acknowledged, the connection will be interrupted. 
24                                                                              May 2005                                                               1740-A2-GB20-20