Help with config Cisco 1800 FTTC / PPPoE

[Jimster]

I've ordered my FTTC upgrade which is getting installed next week 
I'm currenrtly an IDNET customer is ADSL, and connecting with a cisco 1800 with a wic card. My plan is to keep the same router and just use one of the spare ethernet ports for PPPoE to connect to the BT supplied VDSL modem/fibre adapter. Is there any reason why I can't do this?

I asked IDNET to help with the config on my router but said they could not, so hopefully someone here can help me??

Firsty I assume the device which BT supplies also is a DHCP server, or do I need to assign a static DMZ IP to FE0/1 port?

I did a search around for FTTC config and found this info:

http://www.problutions.com/?p=252

<sup>BT Infinity uses VDSL and after having it installed at Home I wanted to replace the horrible BT HomeHub with a Cisco Router. After some digging around and speaking with BT they confirmed you can only replace the HomeHub part of the setup as the White VDSL Modem must remain and cannot be replaced. I was originally looking at the 887 VDSL Router to replace all the equipment so instead I ended up getting a Cisco 2801 and decided to use one of its onboard FastEthernet ports for PPPoE.

Below is the config I used to get PPPoE to work:

First Enable VPDN:

#vpdn enable

#vpdn-group 1

Choose your WAN Interface:

#interface FastEthernet0/1
  description **WAN Interface – PPPoE BT Infinity**
  no ip address
  duplex auto
  speed auto
  pppoe enable group global
  pppoe-client dial-pool-number 1
  no cdp enable
  no routing dynamic

Now you create the Dialer Interface:

**Note BT Infinity doesn't require a password but I couldn't not specifiy so I just put 1234.

#interface Dialer1
  ip address negotiated
  no ip unreachables
  ip mtu 1452
  ip nat outside
  ip virtual-reassembly in
  encapsulation ppp
  dialer pool 1
  dialer-group 1
  ppp authentication chap pap callin
  ppp chap hostname bthomehub@btbroadband.com
  ppp chap password 0 1234
  ppp pap sent-username bthomehub@btbroadband.com password 0 1234
  no cdp enable

The above is only the connection details and how to setup and get working to actually have traffic flow you need to have the NAT all setup:

#ip access-list extended NAT
  permit ip 10.0.0.0 0.0.0.255 any

#route-map NAT permit 1
  match ip address NAT

#ip nat inside source route-map NAT interface Dialer1 overload

#ip route 0.0.0.0 0.0.0.0 dialer 1</sup>


What I can't work out is how does the Dialer interface know to talk over interface FastEthernet0/1?

Any help would be magic

[Jimster]

trying to go through a cisco wizsrd now, a few questions:
Do I need to enabled PPPoE encapsulation?
I assume I can set IP visa DHCP?
What authentication type is used CHAP, PAP or both

Thanks

Jim

[Simon]

Sorry, Jim, I can't help, but I'm sure someone will be along soon. 

[pctech]

The modem is just that, it does not act as DHCP, the DHCP source will be IDNet's server, you can set it as dynamic or 0.0.0.0

Noit sure about the rest, let me have a think

[Jimster]

Hi again, my FTTC connection is due to go live today, and I'm still guessing with the config,

the things I need to know are:

Do I need to enabled PPPoE encapsulation?

What authentication type is used CHAP, PAP or both?

Any help would be really magic.

Cheers

Jim

[Steve]

The vdsl modem acts as a PPPOE to PPPOA bridge. So your cisco router connects via PPPOE and the protocol is CHAP I believe. MTU set at max of 1492.