OT: Bridging ADSL

Hi,

Sort of off topic, but interesting to me :-) I wonder if anyone has
any experience of this.

At home i like to run an ASA with the real outside address, so I use
this setup to bridge the ATM interface to the ethernet. The ASA then
just picks up an IP with DHCP. I also get a 2nd IP off the BVI
interface. My ISP doesn't require PPP.

----------------------------------------------
bridge irb
bridge 5 protocol ieee
bridge 5 route ip

!
interface ATM0
no ip address
no atm ilmi-keepalive
!
interface ATM0.1 point-to-point
  ip virtual-reassembly in
  atm route-bridged ip
  bridge-group 5
  pvc 0/101
   encapsulation aal5snap

interface FastEthernet8
  description link to ASA outside - bridging ATM
  switchport access vlan 5

interface Vlan5
  description bridge group for internet
  no ip address
  bridge-group 5

interface BVI5
ip address dhcp
  ip flow ingress
  ip nat outside
  ip virtual-reassembly in

----------------------------------------------

That all seems to work ok, hoever I've tried to do it with another ISP
that requires a dialer interface for the ADSL, in line with this doc
from cisco which is about bridging ISDN...

http://www.cisco.com/en/US/tech/tk801/tk379/technologies_configuration_example09186a008009457f.shtml

Now. I guess dhcp isn't going to work on the PC/ASA attached to the
fastethernet interface as DHCP ain't the same as PPP IP negotiate.

Anyone see a way to make this work? Maybe if the ISP provided a static IP?

A bit weird I know, and more for fun than anything else. Any ideas?

Paul

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Received on Thu Feb 10 2011 - 18:22:41 ART