PIX/ASA - VLANs in transparent mode?

Unanswered Question
Apr 2nd, 2008

Is there any problem putting an ASA/PIX in transparent mode on an 802.11Q trunk link? I have an internet router that will do NAT to three VLANS and I want to send that trunk through a transparent ASA-5510 for inspection and then onto the trunk port on an internal router. Any problems with this scenario? Or will I have to let the ASA do the NAT and operate in routed mode?

I have this problem too.
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vitripat Thu, 04/10/2008 - 10:53

ASA/PIX when in transparent mode works like a bridge. You can use max. 2 interfaces and these two interfaces need to be part of specific VLANs. It looks like you are connecting these inerfaces to trunk ports carrying multiple VLANs, this will not work. I'm not sure whats your network topology, hence cant suggest if routed mode would be a good option for you. Could you please elaborate more on the network design?

Regards,

Vibhor.

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