Issue about Cisco 3825 with bridged DSL modem

[hxmengmetro]

Hi All,

We have cisco 3825 router with 1 FE card which is connected to one bridged DSL router. DSL router only does bridge function. The other giga interface is connected to the corporate network. So I want to some traffic goes through the DSL connection. So I configured the dialer, dialer list and which traffic should go through DSL in the routing. But it seems the dialer interface can't be up. We have static IP with AT&T. Either I configure static IP with dialer interface or leave it negotiate, it won't be up. Here is my related configuration:

vpdn enable
!
vpdn-group 1
request-dialin
  protocol l2tp

interface Dialer1
ip address negotiated
ip mtu 1492
ip nat outside
encapsulation ppp
dialer pool 1
dialer-group 1
ppp authentication pap
ppp pap sent-username xxxxx password 7 xxxxx
no cdp enable

access-list 1 permit 10.x.x.0 0.0.0.255

dialer-list 1 protocol ip permit

ip nat inside source list 1 interface Dialer1 overload

Any help is greatly appreciated.

Lou

[paolo bevilacqua]

You do not need the vpdn commands.

But you do need pppoe enable and pppoe-client commands under fastethernet interface.

[Todd Pula · Accepted solution]

I am assuming that this is a PPPoE configuration in which case you will need to associate the dialer pool with the interface facing the modem.  Below is a sample config for your reference.

interface GigabitEthernet0/1

description ** Outside Interface **

no ip address

ip virtual-reassembly

duplex auto

speed auto

media-type rj45

pppoe enable group global

pppoe-client dial-pool-number 1

interface Dialer1

ip address negotiated

mtu 1492

ip nat outside

ip virtual-reassembly

encapsulation ppp

dialer pool 1

dialer-group 1

no cdp enable

ppp authentication chap callin

ppp chap hostname testuser@att.net

ppp chap password 7 1a1a1a1a1a1a1a1a1a1a

ppp pap sent-username testuser@att.net password 7 1a1a1a1a1a1a1a1a1a1a

dialer-list 1 protocol ip permit

[hxmengmetro]

Thanks a lot. After I delete VPDN config, it still doesn't work. Called AT&T and found some issue at their side. Finally it's working now. Thank you for the help!

Lou