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F5 Synthesis: Hybrid SSL Offload

Now your services can take advantage of hardware acceleration even when they're deployed on virtual machines

#SSL #webperf #infosec

Now your services can take advantage of hardware acceleration even when they're deployed on virtual machines synthesis-logo

Way back in the day, when SSL offloading was young and relatively new, there were a variety of hardware, software and even architecture that arose to defeat the security penalty imposed by the requisite cryptographic functionality.

Most commonly, we'd slap a PCI-card into a server, muck with the web server configuration (to load some shared objects) and voila! Instant performance boost via hardware acceleration. Later, an architectural approach that leveraged a network-based offload capability was introduced. This meant configuring an SSL offload appliance in a side (or one) arm configuration (common for caches and even load balancers back then) in which SSL traffic was routed to the offload appliance and decrypted before being sent on to the web or app server. You added some latency in the hairpin (or trombone, if you prefer) but that was always more than offset by the improvement of not letting the web server try to decrypt that data in the first place.

We've come a long way since then and most often these days you'll find an application delivery controller (ADC) or an app proxy serving duty as cryptographic master of the application. Most ADCs are still far more efficient at handling SSL/TLS traffic because they've benefitted from Moore's Law in two places: the core system and the SSL acceleration hardware (which takes advantage of CPUs, too, in addition to custom hardware).

Now comes the advent of the next generation of application delivery architectures which, necessarily, rely on a fabric-based approach and incorporate virtual appliances as well as traditional hardware. Services not-expendabledeployed on the hardware of course benefit from the availability of specialized SSL acceleration but the virtual appliances? Not so much.

We (as in the corporate We) didn't like that much at all, especially given trends toward greater key lengths and the forthcoming HTTP 2.0 specification which, yes, requires SSL/TLS. That means a lot more apps are going to need SSL - but they aren't going to want the associated performance penalty that comes with it running on software. They may not be as important, but they aren't expendable. That's true whether the web server natively handles SSL or you move it off to a virtual ADC within the services fabric. All apps are important, of course, but we know that some are more important than others and thus are afforded the benefits of services deployed on faster performing hardware while others are relegated to virtual machines.

We take our commitment with Synthesis to leave no application behind seriously and thus have introduced the industry's first hybrid SSL offload capability.

Hybrid SSL Offload

Hybrid SSL Offload was made available with the release of BIG-IP 11.6 and enables virtual editions of BIG-IP as well as less capable and legacy BIG-IP appliances and devices to harness the power of hardware to improve app performance through cryptographic acceleration. This has the added benefit of freeing up resources on virtual appliances to improve the overall performance and capacity of app services deployed on that virtual edition.

hybrid ssl offload

In a nutshell, user requests are sent to the appropriate virtual ADC instance, which hosts all app services for an app except SSL. SSL is offloaded to a designated service running on a hardware platform that can take advantage of its targeted hardware acceleration.

Using hybrid SSL offload within the Synthesis service fabric allows organizations to:

•Achieve the maximum SSL performance of a virtual license

•Free up Virtual Edition CPU utilization for other application services

All together this means better app performance and capacity for services deployed on virtual editions.

All applications need services and deserve optimal performance, even those that might otherwise by designated as "red shirt" apps by IT. F5 Synthesis continues to leave no application behind by ensuring every application has access to the services it needs, even when it means collaborating across device types.

hybrid ssl offload sdas

More Stories By Lori MacVittie

Lori MacVittie is responsible for education and evangelism of application services available across F5’s entire product suite. Her role includes authorship of technical materials and participation in a number of community-based forums and industry standards organizations, among other efforts. MacVittie has extensive programming experience as an application architect, as well as network and systems development and administration expertise. Prior to joining F5, MacVittie was an award-winning Senior Technology Editor at Network Computing Magazine, where she conducted product research and evaluation focused on integration with application and network architectures, and authored articles on a variety of topics aimed at IT professionals. Her most recent area of focus included SOA-related products and architectures. She holds a B.S. in Information and Computing Science from the University of Wisconsin at Green Bay, and an M.S. in Computer Science from Nova Southeastern University.

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