Setting up Cisco ASA with BT Infinity using BT Homehub

[Simon.peters1]

Hello all,

I currently have a Cisco ASA setup at home with a modem in bridge mode with my ASA using BTI dialout group. It works great but I am looking at setting it up to not use the BTI dialout and use the route outside command but I am not sure how to go about it. I don't have a static IP address from BT so I don't know what the route address would be. I will be using a BT homehub to try and get this setup.

Would anyone be able to point in the right direction in terms of config?

Thanks

[Richard Burts · Accepted solution]

Simon

I believe that you would use something like this in the config of your outside interface

ip address dhcp setroute

HTH

Rick

[Simon.peters1]

Hi Rick,

Thanks for the reply, I already have that in my config but the modem is currently in bridge mode. I want to be able to put the BT logon details back into the router and put it into normal mode and use t with my ASA but I am not sure what to change on my config. I know I will need to remove the pppoe cleint vpdn group BTI but what do I replace it with?

!
interface Vlan2
 nameif outside
 security-level 0
 pppoe client vpdn group BTI
 ip address pppoe setroute 
!

and also remove 

vpdn group BTI request dialout pppoe
vpdn group BTI localname bthomehub@btbroadband.com
vpdn group BTI ppp authentication chap
vpdn username bthomehub@btbroadband.com password ***** 

I know I will need to add a route but not sure what the route address will be as I am not on a static assigned address?

Does that make sense?

Many thanks!

[Richard Burts]

Simon

I am not authoritative about the changes that you need but I believe that you pretty much have them. You need to remove the pppoe client statement from the interface and remove the vpdn commands, and to change the address assignment from pppoe to dhcp.

How to do the route is quite easy once you understand that the setroute parameter in the command instructs the ASA to create a default route and to use information gained from dhcp to determine the next hop address for the default route.

HTH

Rick

[Simon.peters1]

All working, 

I just had to remove the pppoe stuff as suggested and set the below.

!
interface Vlan2
 nameif outside
 security-level 0
 pppoe client vpdn group BTI
 ip address pppoe setroute 
!

Thanks!

[Richard Burts]

Simon

Thanks for posting back to the forum and letting us know that all is working. Good to know that it was a pretty simple set of changes.

HTH

Rick