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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
D
y
namic 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.