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New Member

Bridge to asa5505

Is it possible to bridge a Cisco 1841 t1 router (layer 2 only) to asa 5505 behind it so the ASA gets the public ip address on the outside interface. This will avoid wasting two public ip address on the 1841.

What commands do use on the router to make this happen.

Thanks!

1 ACCEPTED SOLUTION

Accepted Solutions
Hall of Fame Super Blue

Re: Bridge to asa5505

jimmypinto wrote:

Is it possible to bridge a Cisco 1841 t1 router (layer 2 only) to asa 5505 behind it so the ASA gets the public ip address on the outside interface. This will avoid wasting two public ip address on the 1841.

What commands do use on the router to make this happen.

Thanks!


It is but only if the 2 interfaces are ethernet ie. it won't work if you try to bridge a serial interface to an ethernet interface. Config would look somethiing like this -

bridge irb

bridge-group 1 protocol ieee

interface FastEthernet0/1

bridge-group 1

interface FastEthernet0/2

bridge-group 1

int BVI1

ip address x.x.x.x

Jon

2 REPLIES
Hall of Fame Super Blue

Re: Bridge to asa5505

jimmypinto wrote:

Is it possible to bridge a Cisco 1841 t1 router (layer 2 only) to asa 5505 behind it so the ASA gets the public ip address on the outside interface. This will avoid wasting two public ip address on the 1841.

What commands do use on the router to make this happen.

Thanks!


It is but only if the 2 interfaces are ethernet ie. it won't work if you try to bridge a serial interface to an ethernet interface. Config would look somethiing like this -

bridge irb

bridge-group 1 protocol ieee

interface FastEthernet0/1

bridge-group 1

interface FastEthernet0/2

bridge-group 1

int BVI1

ip address x.x.x.x

Jon

New Member

Re: Bridge to asa5505

Thanks!

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