CSS service type nci-direct-return

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Jun 10th, 2008
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This is a two questions part. Can the service type "nci-direct-return" be used with a remote webserver not in-line with another CSS?

Also can the return path be forward to the originating CSS instead to the client who request the content?

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jsivulka Mon, 06/16/2008 - 06:57
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Direct Server Return is not a recommended implementation with CSS. Because source NAT is not required for a one-arm deployment. Source NAT is being leveraged to guarantee symmetric traffic patterns to and from the server farm. Another option is to employ Policy Based Routing (PBR) to achieve symmetric flows.

One-arm designs are typically deployed to maintain the throughput between servers, meaning only traffic requiring load balancing will cross the LB device. I would suggest you determine if the server/application requirements that drove the initial design still exist before making any modifications.


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