Cisco 877 in bridging mode with DSL connection - pppoe

ConstantlyLearningConstantlyLearning Member Posts: 445
Hey all,

I want to configure an 877 in bridging mode and pass off the IP address from my ISP to another device. The device behind the 877 is a PIX 501, I have the IP address on the PIX's outside interface configured as "DHCP setroute" so it should pick up the IP address and gateway automatically.

I reckon the problem is the config on the 877 in my attempt to put it in bridging mode.

I had ppp and pppoe debugs running when testing and used 'show pppoe session' but nothing appeared after plugging in the phone line.

Anyone set this up before and know what the story is?

Cheers.

Relevent config of 877 below.

interface ATM0
no ip address
no atm ilmi-keepalive
pvc 8/35
encapsulation aal5snap
!
dsl operating-mode auto
bridge-group 1
!
interface FastEthernet0
!
interface FastEthernet1
!
interface FastEthernet2
!
interface FastEthernet3
!
interface Vlan1
no ip address
bridge-group 1
!
interface Dialer0
ip unnumbered Vlan1
ip mtu 1492
encapsulation ppp
dialer pool 1
ppp chap hostname username
ppp chap password 7 password
!
!
bridge 1 protocol ieee
"There are 3 types of people in this world, those who can count and those who can't"

Comments

  • fly351fly351 Member Posts: 360
    I've never configured a Cisco router for bridge mode, but I have configured a ton of Checkpoint's VPN/Firewall routers. Bridge mode passes the authentication through the router, so you shouldn't need the commands below:

    ppp chap hostname username
    ppp chap password 7 password

    Why don't you just have the DSL modem authenticate? VPN?
    CCNP :study:
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