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Chapter 3: Accessing the Internet 
                                                                                                                                                                                       
55
PPP over Ethernet (PPPoE) IP Extension Mode 
RDAIUS
 Server
AAA
BRAS
STM-1
DSLAM
Loop
Dynamic Public IP
assigned by BRAS
        PPPoE IP
Extension Mode
Hub
ADSL
Router
Ethernet
PC(S)
PPP over Ethernet
Default Private IP
192.168.1.1
*BRAS: Broadband 
Remote Access Server
ISP
(Internet Service Provider)
 
Description:  
In this deployment environment, the PPPoE session is between the ADSL WAN 
interface and BRAS. The ADSL Router acts as a bridge and gets a public IP address 
from BRAS for your computer. And only the one that got the public IP address is 
allowed to access into Internet. The real IP that you got is acquired from ISP. 
Moreover, no NAT translation will be done at this case. 
Configuration: 
1. 
Start your browser and type 192.168.1.1 in the URL box to access ADSL 
web-based manager.   
2. Go 
to Advanced – Internet – Connections. And click Add
3. 
Key in the VCI and VPI value, e.g.:   
VPI – 0 
VCI – 
39 
Click the Next button. 
4. On 
the 
Configure Internet Connection – Connection Type page, select PPP 
over Ethernet (PPPoE) then click the Next button.   
5. On 
the 
WAN IP Settings page, select Obtain an IP address automatically
check PPP IP extension (and Enable NAT would become disabled 
automatically) then click Next
6. On 
the 
PPP Username and Password page, enter the PPP username and 
password offered by your ISP. Select Always on, and then click Next
7. 
Check the network information on This Internet Connection -- Summary 
page. Make sure the settings match the settings provided by the ISP. Click 
Apply
8. Press 
Finish