Configuring HWIC-ADSL in bridge mode

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Jan 23rd, 2009
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Hello, I have an ADSL connection with ip static (RFC1483, LL5) attached to a HWIC-ADSL on a 2821. Behind it there is a ASA5510, and I would like to configure the 2821 to assign the public ip address to the ASA5510. Is it possible? And if so, how could I configure it?


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Giuseppe Larosa Fri, 01/23/2009 - 02:50
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Hello Victor,

you should configure the C2821 to bridge between its lan interface and the ATM interface.

But if you are using IPv4 over ATM with enc aal5snap (RFC 1483 routed) you can face a problem with your provider.

In fact, by bridging instead of routing the 2821 will try to send out

IPv4/Ethernet /SNAP/ AAL5 PDUs (RFC1483 bridged)

when the provider expects

ipv4/SNAP/AAL5 PDUs (RFC1483 routed)

and no connectivity will result for this encapsulation mismatch.

So without a change also on the provider side you shouldn't be able to convert to RFC1483 bridged your ADSL connection

Hope to help



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