Re: OT: Bridging ADSL

Hey Paul,
glad it worked out. You may want to reduce the ASA MTU in case
your CPE is not doing the fragments (ASA should, I guess :)

-Carlos

Paul Cocker @ 17/02/2011 17:37 -0300 dixit:
> 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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>

-- 
Carlos G Mendioroz  <tron_at_huapi.ba.ar>  LW7 EQI  Argentina
Blogs and organic groups at http://www.ccie.net