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Cisco 867 in half bridged mode


My isp provides me with an adsl connection, details as below.




VCI 100

specific un/pass

I need to bridge my cisco867 such that the public ip is passed on to the device plugged into the lan port of the cisco867.

Can anyone provide me with a config to achieve this. By doing this I am totally under utilizing the cisco router but I have to do this, have no other choice.

I have checked other topics and the config does not seem to match or is not suitable for my requirements.

Here I want the cisco router to hold the PPPoA un/pass and authenticate.

My understanding of cisco devices is low to medium.

Any help will be much appreciated.



this is what i use, if i was to NOT bridge the cisco router



interface ATM0

no ip address

atm vc-per-vp 128

no atm ilmi-keepalive

pvc 0/100

  encapsulation aal5mux ppp dialer

  dialer pool-member 1

  no shut



interface FastEthernet0


interface FastEthernet1


interface FastEthernet2


interface FastEthernet3

switchport access vlan 2

ip nat inside

no shutdown


interface Vlan1

ip address

ip access-group 100 in

ip inspect DEFAULT100 in

ip nat inside

ip virtual-reassembly

ip tcp adjust-mss 1380

hold-queue 100 out



interface vlan2

no shut

ip address

ip nat inside


interface Dialer0

no ip address


interface Dialer1

ip address negotiated

ip access-group 103 in

ip nat outside

ip virtual-reassembly

encapsulation ppp

dialer pool 1

dialer-group 1

ppp authentication chap pap callin

ppp chap hostname

ppp chap password abcd123

ppp pap sent-username password abcd1234

hold-queue 224 in



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