ACE "reverse-sticky"

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Apr 6th, 2010
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Hi all,

        II know reverse-sticky command is not support in ACE, is there a equavient comment that i can ensure "reverse-sticky". I'm trying to loadbalance Cisco NAC servers with ACE. The NAC server LB concept should be like FWLB, i need the return traffic from to go throught the same NAC server that the traffic orginates.

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Gilles Dufour Tue, 04/06/2010 - 04:02
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The solution is to use predictor hash address souce on the frontend ACE and predictor hash address destination on the backend



adrian_teo Tue, 04/06/2010 - 04:31
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Hi Gilles,

             Thank you for the reply. Does the solution needs to be in multiple ACE deployment? As i only have 1 ACE available can it be achived in a single ACE deployment?

Gilles Dufour Tue, 04/06/2010 - 04:53
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This can be done in a single ACE.  You could have 2 contexts 1 for frontend and 1 for backend.

A firewall loadbalancing (FWLB) design is always of the type

outside---------- ACE(front) --------------- Firewalls -------------- ACE(back) --------inside

This is to guarantee that packets flow through the same firewall in both direction.

This can be done with 2 physical ACE's or 2 contexts on a single ACE.

Can also be done inside a single context of a single ACE but maybe more difficult - more confusing.



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