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Chapter 5:Connection Mode
71
PPP over ATM (PPPoA) IP Extension Mode
RDAIUS
Server
AAA
BRAS
STM-1
DSLAM
Loop
PPPoA+NAT+DHCP
on Private LAN
Hub
ADSL
Router
Ethernet
PC
PPP over ATM
Default Private IP
192.168.1.1
ISP
(Internet Service Provider)
*BRAS: Broadband
Remote Access Server
Dynamic Public IP
assigned by BRAS
Description:
In this deployment environment, the PPPoA 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. Moreover, no NAT
translation will be done at this case.
Configuration:
1. Start up your browser and type 192.168.1.1 as the address to enter this ADSL web-based
manager.
2. Go to Quick Setup. Type in the VCI and VPI value. Then click the Next button. eg:
VPI – 0
VCI – 38
3. On the Configure Internet Connection -Connection Type page, select the PPP over ATM
(PPPoA) then click the Next button.
4. In the PPP Username and Password page, enter the PPP username and password that you got
from your ISP.
5. Select Dial on Demand and type in the number for inactivity timeout. The default is 20. Or
select Always on.
6. Check PPP IP extension then click Next.
7. In the Configure LAN side Settings page, type in the IP address and subnet mask for your
LAN. And click Next. eg:
Primary IP address:192.168.1.1
Subnet Mask:255.255.255.0
8. Check the network information. Make sure the settings match the settings provided by ISP.
Click Finish.