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Chapter 3: Accessing the Internet
53
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 receives a public IP
address from BRAS for your computer. And only the one that bears the public IP
address is allowed to access the Internet. 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 – 38
Click the Next button.
4. On the Configure Internet Connection – Connection Type page, select PPP
over ATM (PPPoA) 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.