Please Help!

Unanswered Question
Nov 26th, 2008
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I want to replace a BT Internet modem with a cisco 2811 ADSL ISR.

Please what information do I need to get from BT to successfully configure the ADSL router.


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John Blakley Wed, 11/26/2008 - 08:32
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Well, generally your provider will provide you with either a static address or assigned address. You'll need to contact your provider to see if it's a PPPoE account (uses username and password to get logged in). After that, you would configure your dialer interface, assign it to your public interface on your 2811, and that should be it. I'm assuming that BT is your internet provider?


sr2470182 Wed, 11/26/2008 - 09:00
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Cheers John,

I can see on the BT (internet) modem that it's a PPPoA, 0/38. Also I have that username & password to get logged in.

BT also gave me a range of (5) static IP Address for my network:

81.x.x.x. to 81.x.x.y

with a Gateway 81.x.x.z and subnet mask

However what I am not sure of is if I should configure my Dialer interface with IP Address DHCP or static.

Also do I need to configure interface BVI1.....Sorry, I am a bit confused.


omar.elmohri Mon, 01/05/2009 - 07:30
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Could you please tell me if the user/password that you have are to log to the router or the PPPoE connection ? that's not the same thing.

The IP address may be attributed to you by DHCP, to see make the IP address as negotiated (to be DHCP) on the Dialer interface.

Is it OK ? or need more information ??



sr2470182 Mon, 01/05/2009 - 08:02
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Hi Omar,

The user/password are to login to the PPPoE connnection.


omar.elmohri Mon, 01/05/2009 - 08:07
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Have you did any configuration ? if yes, please send it to me.

If not, here is a sample of PPPoE :


bba-group pppoe global


interface FastEthernet0/0


no ip address

duplex half

speed auto

pppoe enable group global

pppoe-client dial-pool-number 1

no shut


interface Dialer1

ip address negotiated

ip mtu 1492

ip nat outside

ip virtual-reassembly

encapsulation ppp

dialer pool 1

dialer-group 1

ppp authentication chap callin

ppp chap hostname

ppp chap password


ip route Dialer1


Please try this a give a feedback.

Rate if that help.




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