Re: OT: Bridging ADSL

hi Carlos,

looked into a bit more and apparently you can use pppoA or pppoE, so I
tried pppoe and seemed to get it working. only problem is one of the
routers seems to refuse to fragment packets now, which is a bit odd (I
have adjusted the mtu to take account of the larger ppp packets).

for any interested readers, below is the basic config to get the
assigned IP from the telco onto another router.

Paul

------------------------
PPPOE client
!
vpdn enable
vpdn-group 1
!
interface GigabitEthernet0/1
no ip address
duplex auto
speed auto
pppoe enable group global
pppoe-client dial-pool-number 1

int gig0/0
desc inside
ip tcp adjust-mss 1452
ip address ..
!
interface Dialer0
mtu 1492
ip tcp adjust-mss 1452
ip address negotiated
ip flow ingress
ip nat outside
ip virtual-reassembly
encapsulation ppp
dialer pool 1
dialer-group 1
no cdp enable
ppp authentication chap callin
ppp chap hostname xxxxxxxxx_at_hg39.btclick.com
ppp chap password 7 xxxxxxxxxxxxxxxxxxx
ppp ipcp dns request accept
!
ip route 0.0.0.0 0.0.0.0 Dialer0

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

hostname bridging_router

bridge irb
!
interface ATM0
no ip address
no atm ilmi-keepalive
pvc 0/38
encapsulation aal5snap
!
dsl operating-mode auto
bridge-group 1
!
interface FastEthernet3
switchport access vlan 1

interface Vlan1
bridge-group 1
!
bridge 1 protocol ieee
bridge 1 route ip
!

On 11/02/2011 20:25, Paul Cocker wrote:
> Hi Carlos,
>
> At home it's just standard ADSL, not ATM. I don't really understand
> why you don't need the dialer interface for it.
>
> Afraid the other ISP is PPPoA not PPPoE
>
> Thanks for your input,
> Paul
>
>
>
> On 11/02/2011 10:53, Carlos G Mendioroz wrote:
>> Paul,
>> at home it seems you are getting IP over ATM.
>> But now, with the dialer interface, you might be using PPPoA or PPPoE.
>> In the first case, I guess you are OOL.
>> If PPPoE, you could bridge at the CPE and terminate the pppoe link
>> directly at the ASA.
>>
>> http://www.cisco.com/en/US/products/ps6120/products_configuration_example09186a0080ab7ce9.shtml
>>
>>
>> -Carlos
>>
>>
>> Paul Cocker @ 10/02/2011 15:22 -0300 dixit:
>>> 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 17 2011 - 20:37:10 ART